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Inferno #04
22 июня 2003 |
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Softinka - The functions of the operating system ZXVGS.
Options ZXVGS
All functions ZXVGS caused by RST # 08
with the number of functions in the next byte (hook
code). The program continues to address
lying for hook code.
RST # 08
DEFB function
In the following tables the column labeled "input" describes
the registers containing the function arguments. Column marked
"exit" - the register in which function returns, and other
registers are unchanged. The contents of AF at the entrance
ignored, the state F at the exit is not defined. In some cases,
the function can set the 7-bit register R, it would mean that
one or more screen interrupt was missed.
Byte value after RST 8.
# 00 - # 1a - BASIC interpreter errors
# 1b-# 31 - Interface a hook codes
# 32 - # 47 - command codes DISCiPLE
# 78 - # 7e - Internal Use
RSX'ah
# 7f - internal call ROM
# 80 - # 83 - Joystick
# 84 - # 85 - mouse
# 87 - # 88 - speed
# 89 - # 8f - Keyboard
# 90 - # 9f - control the screen - so far
not used
# A0-# a1 - Information
# A2-# a3 - setup (config)
# A4-# a5 - sound
# A6-# a7 - Screen
# Ac-# af - RSX'y
# B0-# bf - memory banks
# C0-# c1 - the current path (current path)
# C2-# c3 - directory
# C4-# c7 - disc information
# C8-# cf - Working with Files
# D0-# db - direct access to files
# E0-# e7 - operation with files that have
headlines (headers)
# E8-# e9 - image
# Ea-# eb - shipment Games
# Ec-# ed - work with pieces of files
(Raw data)
# Ee-# ef - the selection of files
# F0-# f7 - Printer
# F8-# fb - Overlays
# Fc-# fe - system calls
# Ff - OK
Notes:
* Interface a hook codes are processed
through MDR.RZX and BI1.RZX.
* Commands are processed through DISCiPLE
MGT.RZX and BD1.RZX.
Internal call ROM
Code # 7F is reserved for internal use
system.
Used to call ZX Rom from the system.
Joysticks
Note. Function calls # 80 .. # 83 can
be interrupted by the user. To avoid
exit without saving the results, use # A3 (will be available in
future versions).
Perhaps the use of 4 independent joysticks. Usually used the
first two. The meaning of bits 0 .. 4 is compatible with the
value from the port of Kempston joystick (# 1F, b0 = right, b1
= left, b2 = down, b3 = up, b4 = fire). Bit 5 - the second fire
(usually not used). Bits 6 and 7 are common to all joysticks
represent two more buttons. Bit 6 (HALT) can cause delays in
the game (when fitted) or activate the option. Bit 7 (EXIT) can
interrupt the game or cause a transition the main menu.
The specification calls:
Number name description input output
# 80 J0 read joystick 0 - A = state
# 81 J1 read joystick 1 - A = state
# 82 J2 read joystick 2 - A = state
# 83 J3 read joystick 3 - A = state
Using a Mouse
You can use an external mouse (operated outside the main
program), as well as generates an interrupt. The problem of
computing absolute coordinates, drawing a pointer and
track events are on your programme.Dlya use the mouse in any
management programs with the following requirements:
1. Disable interrupts! Turn on IM 2.
2. Set the value of the register I (preferably # 80 .. # FE).
It must not point in ROM!
3. Fill in the interrupt table (257
bytes from the address I * 256) identical bytes.
Beware! Some types of mice (AMX) generate vectors IM 2!
4. At the address indicated interrupt table, place:
NOP
NOP
NOP
JP ownint
"Ownint" - address maintenance procedures
preryvaniy.Esli you do not need a handler, you can put EI: RETI
instead transition.
5. Book 128B buffer for maintenance procedures mouse. Put the
address this buffer in the HL (# 5B00 .. # FF80). You do not
will have to spoil this area after
setting your mouse.
6. Book a byte to store the horizontal smescheniya.Pomestite
his address in BC.
7. Book a byte to store vertical displacement. Put his address
in DE.
8. Call the function # 84. She will fill
buffer and the area under the NOPs. And in the case
need to replace the interrupt table.
9. Allow me to interrupt!
For older programs, it is recommended to put XOR A: RET in the
beginning of the buffer to avoid crashes when you call to
initialize the mouse.
Coordinates will be changed to the specified address. They are
all 8-bit. You can only read them and compare with the
standards for opredeneniya changes. To test buttons
simply call the procedure from the beginning of the buffer. It
will return the state of the buttons in A, preserving the
values of other registers (b0 = left button, b1 = right; bit
set indicates the press). Please note that some types of mice
(RS232, AMX) can generate its own interrupt, useless for our
program. All non-staff interrupts are "eaten" (return address
is removed from the stack). And if the return address refers to
the byte after the command HALT, it will be decremented to
continue to HALT human interruption. The mouse can be
deactivated by specifying 0 as a buffer address (in HL). Data
returned in this case, are useful for the RSX
- They help to disable the driver used by the main program,
connect your driver to process the request, after which
turn off your driver and return the driver of the main program.
The specification calls:
Number name description input output
# 84 MSEINI set I = page A = result
Mouse BC = ^ xcoord
DE = ^ ycoord
HL = ^ buf
interview HL =??? A = result
Mouse BC = ^ xcoord
DE = ^ ycoord
HL = ^ buf
disable HL = 0 A = result
Mouse BC = ^ xcoord
DE = ^ ycoord
HL = ^ buf
# 85 MSEGET read state - A = keys
(For ext. B = dy
use) C = dx
Speed
Function # 87 switches the processor into a rapid
rezhim.Skorost not qualified - simply assumed that the program
works faster. Function # 88 returns the processor is in
standards mode is 3.5MHz.
The specification calls:
Number name description input output
# 87 FAST (Scorpion) - A = result
accelerates
work
CPU
# 88 SLOW (Scorpion) - A = result
returns
3.5MHz
Keyboard
Extended keyboard can be used to enter text in certain programs.
Provides several additional buttons (on the emulators, SAM
Coupe, ZX128 keypad).
Will be used in BASIC, if there will be patches or ways to
intercept INT.
Function call # 8F??? should be placed in
IM 2 processor, at least to the conservation
AF. Or may be caused by illicit
interrupts about 50 times per second.
While not apply! Not completed yet!
The specification calls:
Number name description input output
# 8C? KBDGET get char () (A)
from buffer
# 8D? KBDTST read char () (A)
from buffer
'Leave it
# 8E? KBDMOD mode selection (BC) (A = result)
# 8F? KBDINT sync. () (A)
interrupt
Management Screen
Function # 90 .. # 9F designed to display the menu, move the
mouse pointer and text output in 42, 51 or 64 column. In
particular, the additional screen modes.
In the current version ZXVGS not implemented!
The specification calls:
Number name description input output
# 9F? CHOICE ask user HL = ^ title A = result
what to do BC = ^ options
The specification calls config 'system info:
Number name description input output
# A0? Unknown
# A1? Unknown
Function Setting
Teams # A2 and # A3 mashinnozavisimymi control functions.
Parameters:
Option D E meaning
Type # 80-83 0 does not change
joystick 1 Sinclair 1
2 Sinclair 2
3 Kempston
April Fuller
5 arrows SAM Coupe
+
6 function
Button SAM Coupe
7 (undefined)
8 TC2068 left
(AY # F5, # F6)
9 TC2068 right
(AY # F5, F6)
Type mice. # 84 0 Kempston Mouse
Changing a server mouse
impossible, 2 SAM Mouse
when the driver 3 J3 mouse
active. 4 AMX Mouse
5 AY mouse
(Ukrainian)
6 (undefined)
7 (undefined)
8 M $ Mouse
in YAMOD.8250 / 0
9 M $ Mouse
in YAMOD.8250 / 1
10 M $ Mouse
in YAMOD.8250 / 2
11 M $ Mouse
in YAMOD.8250 / 3
The presence of # A4 mask (1 = no)
Sound
devices.
Printer Type # F7 (not defined)
The specification calls:
Number name description input output
# A2? GETCFG take the function D = A = error
setting E = mode
function
# A3? SETCFG establish the function D = A = error
parameter E = mode0
function E = mode1
Sound configuration
Function # A4 provides information about available audio
devices. Bit 0 corresponds to the beeper on port # FE, bit 1 -
BEEPER procedure in ROM Beysika.Sbroshenny bit means - do not
generate sound in this way (you do not want to hear this
sound). Fixed bit 2 indicates the presence AY-3-8910 / 2 ports
# BFFD and # FFFD (as well as # BEFD and # FEFD for misspelled
players), bit 3 - chip SAA 1099 (SAM Coupe) by port # 00FF and
# 01FF. If one of the two last bit is cleared, you should not
use these ports! This can lead to crash!
If this function is called without first calling the function #
A5 (post # AF), it identifies all the available audio devices
(downward compatibility, will be removed).
Function # A5 is used to auto-detect audio device. Device number
should be in D, and some of the parameters - in
E. (An asterisk "*" indicates that the device
has fixed the port addresses.)
Parameter to the function # A5
D unit E
# 01 * AY-3-891X (ZX128) channels (in the form
Register 7)
# 02 * AY-3-8912 (TC2068) channels (in the form
Register 7)
# 03 * both (1 and 2) channels (in the form
Register 7)
# 04 * SAA1099 (SAM) channels (in the form
Register 14'15
; B6, b7 - your choice)
# 08 8255 D / A (MB-02) channels b0 .. b3
The specification calls:
Number name description input output
# A4 SOUND information - A = flags
# A5? OPENSOUND find D = A = number of difference
unit E = E = channels channels
Display Settings
# A6? VIDEO () (A, D = ula, E = mode, B, C)
returns the type of ULA in the D (Display Properties)
Options - in the case D
Country D computer graphics
England # 00 Sinclair ZX ULA 6C001E-7
Spectrum (+)
# 01 Sinclair AMSTRAD 40056
ZX + 128
# 02 Amstrad ZX +2 ULA 7K010E5
# 03 Amstrad ZX GATE ARRAY
+2 A / +2 B / +3 40077
# 0C MGT SAM Coupe ASIC
Porto # 20 Timex TS 2068 - 60Hz
gallium Sinclair 2068
# 21 Timex TS 2068 -
Computer 2068 50Hz, grey
# 22 Timex TS 2068 -
Computer 2048 50Hz, black
Poland # 80 ELWRO 800?
Junior
#? Solum?
Russia # C0 Pentagon?
# C1 Scorpion ZS?
et al # F0 Warajevo emulator
# FF unknown
B, C - parameters of the time frame synchronization in ticks
Z80 (fast RAM)
# A7 OPENVIDEO
Log (BC = timing, DE = mode, HL = buffer)
Exit (BC = timing, DE = mode, H = tacts, L = len)
Options # E8, # E9, # F3 use the value
screen mode (screenmode).
LINT: + # 80
LINT interface generates an interrupt to the
how the display line indicated in the port # F9. Interrupt can
be recognized cheniem port # F9. Presence should be determined
by the function # A???. (At the moment such a possibility is
supported only on SAM Coupe.)
the main modes of non-core modes
E Bulletin E description
# 00 Standard # 08 Standard
screen # 4000 screens # 4000
and # C000
# 01 Standard # 09 Standard
screen # 6000 screens # 4000
and # 6000
# 02 high colour # 0A high colour
screen # 4000 screens # 4000
and # C000
# 03 hires # 0B hires
screen # 4000 screens # 4000
and # C000
# 04 Standard # 0C standard
screen # C000 screens # 4000
# 6000, # C000, # E000
# 05 Standard # 0D standard
screen # E000 screens # C000
and # E000
# 06 high colour # 0E high colour
screen # C000 screen # 4000
and # C000 - 1:3
# 07 high colour # 0F high colour
screen # C000 screen # 4000
and # C000 - 1:2
When HL> # 4000 at HL placed relotsiruemy code for selecting
one of the main screen mode. In this case, L contains
the length of this code, and H - the number required him
taktov.Vyzovami with H = 0 mode is selected directly.
The specification calls:
Number name description input output
# A6? VIDEO info? A
on the screen D = ula
E = mode
B
C
# A7 OPENVIDEO include BC = timing BC = timing
display DE = mode DE = mode
Mode HL = buffer H = tacts
L = len
Management
Resident Expansion
Resident System Extentions (RSX)
Function # AC is used to load RSX
in memory of the system without activation. In the case of
no errors (A = 0), handle (handle) selected RSX back in D.
Function # AD? calls internal functions
of the available RSX.
Function # AE is designed to control
all loaded RSX.Pri E = 0 puts in HL
name of the file that caused the boot program or an error if
the program was launched directly, without reference to the
file. BC must contain a buffer size of at least
# 0080.
# AF function loads the RSX, the corresponding
file extension, followed by the RSX download the file. For
example, for File "GAME.Z80" RSX is loaded from a file
"ZX: Z80.RZX". This is not the case
Extensions "V00" (native program ZXVGS)
and "RZX" (RSX will ship directly, and not
"RZX.RZX").
Function # AF downloads:
* Files "*. V00" - the desired program (then the file "*. SV
@", if it exists) * For "*. RZX" - required RSX,
* For the rest - "ZX: ext.RZX" (if found; "ext" - the file
extension), and the name of the file will be available through
the function # AE at E = 0;
The specification calls:
Number name description input output
# AC RSXINIT take RSX DE = ^ rsxname D = handle
A = error
# AD? RSXCTRL call D = handle?
function RSX E = A = error function
# AE RSXINFO information E = what?
on the RSX HL A = error
BC
# AF RSXLOAD download DE = ^ filename
file RSX'om A = error
Memory banks
These functions, you can manage up to 4MB
memory. (What does the result 4128kB mode
16kB 8208kB mode or 32kB.)
Introduction
There is a 16kB RAM switchable in the upper
(Section D) of memory (# C000 .. # FFFF).
It is possible to use virtual
memory banks, the contents of which will move the software.
Banks # 00 .. # 07 preferred and can be switched quickly, the
individual functions # B0 .. # B7 with no arguments.
The Bank must be opened before the operation with
him. If the opening is not enough memory
(RAM in case of non-virtual banks or
external memory for virtual), generated a fatal error. Pre-
Check the free space!
Outdoor pot filled with zeros. Options
do not check the PC, SP and I, so using them in the wrong
context can cause a system crash.
If, for hardware reasons it is impossible to switch the top
quarter of memory available only virtual banks (with a long
switching time). If the hardware can only reasons to switch
both the upper quarter of the memory simultaneously (32kB, #
8000 .. # FFFF), then switching the top quarter of the
simulated with or without rewriting another quarter (section
C). In this case, can not open bank switching
quickly and not debasing this section C. She
copied when it opens.
There are three types of banks:
1. Individual - numbers 0 .. 15 - each can be opened in his
regime. 2. Parametric - numbers 16 to the return value of
function A # BF. This group exists only if the function # BF
returns greater than 15. Open mode is determined for the first
public bank in this group and will be the same for others. 3.
Virtual - numbers in excess of the value returned by the # BF.
This group exists only if the function returns # BF A value
less than 255. Open mode determined for the first public bank in
group and will be the same for others. These
Banks can only be opened as virtual. To open the first virtual
Bank at least one of the real banks
should be opened as a slow (bit 0 in
Register D dropped) - he will replace the state
on virtual and will be used for
Storage of virtual memory (banks, particularly public, preserve
the real state).
Options
Options # B0 .. # B7 choose one of the privileged
bankov.Funktsiya # B8 choose any bank - his number is
transferred in register E.
Function # B9 provides information about banks.
Function # BA used to get a piece of code switching banks. For
more details see next section.
# BB function copies the contents of section C
all open 32kB pages, or ignored in the case of 16kB-page mode.
Function # BC tries to open the Bank E and D mode and returns
udavshiysya regime D. See the table settings.
Function # BD closes bank E. If E is included in the current
bank, then contents of the top quarter of the memory is not
defined (ie, may contain ROM or # FF-s) to select another bank.
Function # BE closes all banki.Soderzhimoe
top quarter of the RAM is undefined.
# BF function returns the register number of the E
current bank, and in case D his regime.
The register B returns the number of open bankov.Registr A
contains a number of additional banks (except virtual):
* 0 - 48 kB (standard ZX48)
* 1 - 64 kB (32kB usually one bank, so called ZX80kB)
* 2 - 80 kB (two additional bank -
usually 16kB)
* 5 - 128 kB (five additional banks
- ZX128)
* 6 - 144 kB (view extended TC2048)
* 27 - 480 kB (Pentagon 512kB two
reserved pages)
Parameters:
D vh.dannye vyh.dannye # BC # BD / BF
when 1 when 0 when 1
0 must click
quickly? bit1 = 0 bit1 = 1
(Not virtual) 0 16Kvirt 32Kreal
1 domain bit0 + copy C
# 8000 .. # BFFF a 32Kreal 16Kreal
does not change?
2 contains a screen? no screen is a screen
3 corresponds to the incompatible compatible
Bank ZX128? with OUT # 7FFD with OUT # 7FFD
OUT (# 7FFD), E +16
4 can be put there, it is possible
Table IM 2 will "snow"
without "snow"? "Snow" will not
5 processor is yes, would not the bank
inhibit ULA? brake fast
6 supports 8 no, but yes, 8 bits
(???) bit color 1-bit color
7 will even open will not open
if not, is Soble
to their demands?
Function # BA - fast switching banks
Allows banks to click a lot faster.
Follow these instructions:
1. Determine whether your program
work in a 32kB page mode. If
not, use mode% XXXXXX11 (will not be
to work on some types of equipment).
Otherwise, 32kB or 16kB.
Make sure stack and interrupts.
2. Open a bank function # BC.
3. Book 32B for the program to switch pages. Program moveable.
To use the program without moving it, you can fill the buffer
with zeros, and place it in its complete programmu.Ili 33 bytes
code "RET" (# C9), or "JP (HL)" (# E9), depending on the
structure of your program.
4. Book two bytes in the
# 5B00 .. # 7FFE, put their address in BC at
the first call to # BA (then BC will be
ignored).
5. Call the # BA to put
Package include Bank E at HL. Function returns the actual
length of the code in the BC and the number of ticks in A. DE
point to the byte after the code so you can add (using LDIR) go
your own code. 6. To select the bank, call this code.
Remember!
* Each bank has its own program of inclusion.
* (!!!) Code can be moved anywhere
place and at any time.
* Code MUST NOT be used after the closure of the bank!
The code, issued by the function # BA, no longer
32 bytes.
* He always spoils AF, BC, and sometimes, but
that uses the stack.
* To call any function ZXVGS you MUST call the code that
includes a page that stood before the first call of these codes
(the latter bank, selected functions # B0 .. # B8). * Code
MUST be in the bank, which He vklyuchet.Problem not occur when
placing the code in the address # 4000 .. # 7FFF. After placing
it in the address # 8000 .. # BFFF you can call a function to
copy the # BB it in other banks. But if you want
use it with the addresses # C000 .. # FFFF, you
themselves must copy it in the included
page.
* In some cases (such as emulators) function returns the # BA
# FF, which means that the code contains a function call
# B8. Remember the stack!
The specification calls:
Number name description input output
# B0 BNK0 include - A =?
.. .. privileged # B7 BNK7 vanny Bank
Fatal Error
when unopened
# B8 BNKE include - A =?
any bank
Fatal Error
when unopened
# B9 BNKCTRL data DE = infonum A
Bank of BC
DE
HL
# BA BNKCODE get E = number BC = length
program HL = ^ buffer DE = ^ end
Switching BC = ^ word A = tacts
# BB BNKCOPY copy - A =?
section C
all banks
# BC BNKOPEN open D = mode0 D = mode1
Bank E = number A = xor
# BD BNKCLOSE close E = number A =?
jar
# BE BNKRESET close - A =?
All banks
# BF BNKINFO information - B = opened
for all D = mode
Banks E = bank
A = memory
Current directory
The specification calls:
Number name description input output
# C0 GETPATH current path DE = ^ buf A = error
(Disk) name = DE ^
Begins with a drive letter and colon
# C1 SETPATH Change the way DE = ^ name A = error
Reading the contents of the directory
# C2 function returns the directory entry,
selected function # C3. HL points to the
string format (as determined by the function # C3
used either at H = 0, or if HL
indicates the zero-byte internal system structure is returned
when H = 1), DE points to a buffer. In this buffer is returned
directory entry - ASCII Text, ready for display. (Use the HL =
0 for fill the file selector (fileselector),
then HL = ^ '% f% n' for taking the file name
selected by the user.)
Function # C3 chooses directory finds elements and copies them
into an internal buffer. (The buffer should be released (DE =
0) after read completely directory.) HL indicates
on the format string (system format on
default or at H = 0 or
if HL points to null byte internal system structure is returned
by H = 1). Can use the following formatting characters:
*% A attributes
*% B number of allocation units, engaged in a file or string
"Dir" *% C file comment
*% D date of last modification
*% E filename extension
*% F the path to (real)
*% G group name files (GID)
*% K number of the first allocation unit
*% L the length, in bytes, or the string "Dir"
*% M file name without extension
*% N filename extension
*% P path (the pointed by DE)
*% S file name extension (?)
*% T the time of last modification
*% U username file (UID)
*% X attributes U * IX
Other characters are copied without change.
Decimal number between% and the letter indicates a fixed width
polya.Polozhitelnye value - right-aligned,
negative - on the left. Value after
point indicates the number of cut characters
in a row. Examples:
"%-16.16m%-3.3e% l" - NeOS 1.0 style
(DEC)
"%-8.8m <% 1.1e>% 3b% 13l" - TR-DOS style
(Start parameter is not available)
"% X%-9g%-9u% 8l% 6d% 5t% n" - U * IX style
(Ls-l)
"%-9.8m%-4.3e% 13l% 9.8d% 9t" - MS-DOS 6.20
style (default)
Internal system structure consists of
following fields (not fully defined):
* + # 00 - - 4B;
* + # 04 - - 4B;
* + # 08 - - 4B;
* + # 0C - - 4B;
* + # 10 - - 4B;
* + # 14 - - 4B;
* + # 18 - - 4B;
* + # 20 - ASCIIZ filename without a path -
to 32B;
Free disk space can be found at the "# C4 or # C5.
Note: some drives (most of the network, such as "TCP:", "HTTP:"
or "FTP:") do not show all possible subdirectories, but only
those that have been used recently (or are in the tabs).
The specification calls:
Number name description input output
# C2 take the element BC = number of A = error
Catalog HL = ^ buf1 HL ^ = entry
(Entry) DE = ^ format DE =?
BC =?
# C3 set HL = ^ name A = error
mask DE = ^ format BC = number of
Directory BC = attr DE =?
HL =?
Data on disk
Options # C4 and # C6 return information
specified drive / path or file.
Options # C5 and # C7 change information
specified drive / path or file, but only
if possible.
Options
BC returns # C4 # C6
# 0000 disk space in KB HL ASCIIZ text
# 0001 depth directory L ASCIIZ text
(1 = root)
The specification calls:
Number name description input output
# C4 GETINFO get DE = ^ name A = error
parameters BC = infonum BC
numerically HL DE
form HL
# C5 SETINFO set DE = ^ name A = error
parameters BC = infonum BC
in the numerical value HL = DE
form HL
# C6 GETINF $ get DE = ^ name A = error
parameters BC = infonum BC
in the form HL = ^ buf DE
line HL
# C7 SETINF $ set DE = ^ name A = error
parameters BC = infonum BC
in the form HL = ^ value DE
line HL
Manipulating files
# CB function deletes a file or directory
(Directory must be empty).
# CC function checks for the file (error or not).
The remaining functions are not defined yet.
The specification calls:
Number name description input output
# C8? RESET Initialization - A = error
filesystem
# C9? FLUSH release - -
all buffers to disk
# CA? MAKE create a DE = ^ name - "
or directory
# CB KILL to delete the file DE = ^ name - "
or an empty directory
# CC EXIST check DE = ^ name - "
presence of a file
or directory
# CD? ASSIGN connects DE = ^ name - "
new drive HL = ^ newname
# CE? MOVE move / rename DE = ^ oldname - "
files / directories HL = ^ newname
# CF? COPY duplication DE = ^ srcname - "
files / directories HL = ^ desname
Simple file functions
Options for working with files. If you want to download the
entire file into memory, or to retain a portion of memory as a
file, see first function # E0 .. # ED.
Function # D0 always closes the file with the specified handle.
If the handle is given as 0, it will close all open files.
# D1 function opens a file for reading (returns an error if the
file does not exist). # D2 function opens a file for writing -
delete an existing file and create a new,
zero length.
Function # D3 opens the file and read, and
on zapis.Esli file does not exist, it will
created with the first record.
Options # D4 .. # D7 are used for reading and
record file. Options # D4 # D5 and remit
the number of bytes (returns
The number of bytes transferred in fact - if
it is less than requested, an error is generated). # D6
function reads bytes from a file to limit or to the values #
00 or # 0D (including them). Function # D7 writes bytes to Byte
# 00, which is not recorded. It can be written only when the
first byte in line.
# D8 function returns the current position in
file. # D9 function allows you to move
current position in the file and returns the old position in
fayle.Smeschenie counted depending on the register B: # FF means
"From the beginning," # 00 "from the current position", and # 01
Since the end of a file. Error value is returned if crossed the
start or end file. Addressing capabilities file of up to
8MB (23-bit addresses).
Function # DA says, is whether the current
position at end of file (EOF).
# DB function truncates the file to the current position.
Following features - an almost direct calls
systemic structure FILEDISK. Its definition can still be
changed in the future.
The specification calls:
Number name description input output
# D0 CLOSE to close the file handle to D = A = error
# D1 OPENI open file DE = ^ name A = error
read D = handle
# D2 OPENO open file DE = ^ name A = oschibka
write D = handle
# D3 OPENO open file DE = ^ name A = oschibka
read / write D = handle
# D4 READ reads D = BC = readed handle
from the File BC = length A = error
HL = ^ databuf
# D5 WRITE record handle D = BC = written
a file BC = length A = error
HL = ^ data
# D6? GETL read line D = A = handle error
from the File BC = maxlen BC = length
HL = ^ linebuf
# D7? PUTL record string handle D = A = error
to file HL = ^ line
# D8 FPOS get a handle D = EHL = pos
current position of the A = error
# D9 SEEK set D = handle EHL = oldpos
the position where B = A = error
EHL = newpos
# DA? EOF checking D = A = handle error
at the end
# DB? TRUNC cut the file handle to D = A = error
on the current position
Files with the headline
Options # E0 .. # E7 operate on files with a title (like tape).
Before calling a function # E4 .. # E6 type header must be set
to one of the functions # E0 .. # E3. This setting is valid
until the next call to any of the functions
# E0 .. E3. If the file exists, then in certain registers,
return values, taken from the title of this fayla.Esli file is
missing or the type of title does not conformity is not, it
returns an error indication. Error can be ignored if it made an
entry in the file, but Reading such a file will always result in
an error.
At the entrance to the function # E3 buffer size indicated in
BC. The length returned in BC, is limited to this size, whereas
the DE contains the actual size. This is to avoid the
limitations of tape - you can not upload a real tape the first
few byte file length, and its checksum could not be verified.
Also, BC = # 1B00 and HL = # 4000 are recognized as your wish
download or burn the screen (although you
can download it and save from other
addresses).
Reading and writing an error if we assume
or recorded fewer bytes than trebovalos.V
this case, check the BC.
The operation verification is equivalent to reading and
occurs both on tape - error if the data is different or the
file is too short.
Function # E7 vyzavaetsya before # E4 .. # E6. Allows you to
set the offset, which gives the possibility of sequential access
file. This means, for example, the reading of successive parts
of a file in different banks memory. Error is returned when the
position goes through the end of the file. Options
# E0 .. # E3 always set the offset to 0
(Immediately after the title).
Calling any of the functions # E4 .. # E7 without calling one
of the # E0 .. # E3 causes a fatal error.
File with the headline can be up to 65535 bytes
long (not including the header). Rest
cut off. The header format may vary in different file systems.
Therefore, discouraged processing files with a title with the
help of other functions, except when a file or a screen play
shipment.
For files with extensions other than
". CZX", ". DZX", ". DAT", ". ROM", ". SCR", called
sootvetstvyuschee RSX. So you can, for example, download data
or BASIC program from a file "*. Z80"! For details, see the
documentation for the RSX.
The specification calls:
Number name description input output
# E0 HEADER0 select File DE = ^ name A = error
type of program BC = prog DE = length
HL = line BC = prog
HL = line
# E1 HEADER1 select File DE = ^ name A = error
Type H = DE = tip'imya length
number array H = tip'imya
# E2 HEADER2 select File DE = ^ name A = error
Type H = DE = tip'imya length
character array H = tip'imya
# E3 HEADER3 choice DE = ^ name A = error
Binary BC = maxlen DE = length
File HL = start HL = start
BC = length
# E4 LOAD read the file, the length of BC = A = error
in memory of HL = start BC = readed
# E5 SAVE write to the file length BC = A = error
from memory HL = start BC = written
# E6 VERIFY to compare the length of BC = A = error
File HL = start
memory BC = verified
# E7 SHIFT move DE = shift A = error
position in the file
Screen Files
To read or write Spectrum screens can be used and the function
# E8 # E9. Operation always involves 6912
bytes of memory. Separating these functions allows you to
convert graphics from / to different image formats. Recorded
screen is 256x192 pixels and 16 colors, but there may
isklyucheniya.Esli contents of the downloaded file is not
compatible with restrictions Spectrum, the result will not
opredelen.Oshibka returned if the file was not recorded, or
does not exist or format is not recognized.
In future releases will be used ZXVGS
RSX to read and write images with extensions other than ". SCR"
and ". CZX". These functions can also be shown on the screen
dialog with a list of valid formats if
was not given the file extension or file for
reading is missing, or the name of the file is empty.
Other display modes are also supported.
The specification calls:
Number name description input output
# E8 LOADSCR load screen DE = ^ name A = error
from file HL = addr
# E9 SAVESCR save screen DE = ^ name A = error
to file HL = addr
Files game shipments
Options # EA # EB and designed to preserve and restore the
state of gaming or configuration of these programm.Vyzov
function allows the user to select
one of 10 such files. When you save
users may comment fayl.Fayly saved with the name of the current
program and one of the extensions "SV0" .. "SV9" (User
selectable).
D = 0 dialog appears and the file will
the default extension ". SV?". In this case, E contains the
character code placed in the 3-th position of the extension
(unfit characters are replaced by "!"). This is available for
download defoltnoy configuration when you run or save the
output. The comment line at Conservation is set to "Autosaved"
(May include date and time). This
can be used along with standard
call (when the user selects himself)
For the function # EA at HL = 0 uses the address from the
header.
Expansion of "SV @" (E = # 40) reserved
to store the file table records. If
file exists, ZXVGS download "*. SV @"
immediately after the file is "*. V00". Later, the file is
saved when the user invokes the menu ZXVGS. The new curricula
must be preserves the function # EB at each table updates
rekordov.Fayly "*. SV?" stored and loaded on the disk "SV:".
The specification calls:
Number name description input output
# EA LOADCFG load settings BC = length A = error
DE = ^ title
HL = addr
# EB SAVECFG save settings BC = length A = error
DE = ^ title
HL = addr
Files without a title
Function # EC is used to load a file or its initial part of the
memory. The error code is returned if it was Loaded fewer bytes
than requested.
Function # ED is used to save
continuous area of memory to a file. Code
error is returned if it was stored
less bytes than the required (low on
ROM).
Always check the BC error.
The specification calls:
Number name description input output
# EC LOADANY load BC = length A = error
any file DE = ^ name BC = readed
HL = addr
# ED SAVEANY save BC = length A = error
any file DE = ^ name BC = written
HL = addr
File selector
Options # EE # EF, and allow the user to
select or enter the name of the file or directory in easy way.
Perhaps an indication of the default name and the restriction
of choice mask. The mask can be edited by the user, which means
zaisklyucheniem "*/", choice of directory. There is also the
title of the operation. To view the results (with path) to
reserve 128 bytes a buffer. Functions return an error if
file selector was abandoned on the button
<EDIT>, Or file name is blank.
# EE function always returns the screen (memory # 4000 .. #
5AFF) intact, that in many cases results in a limited way
selector. Function # EF always uses full-screen interface, but
leaves the screen in a random state. After This requires a
screen refresh.
It is recommended to use file selectors for each case specify
the names of files the user.
If the mask is "*. SZX" or "*. SCR",
a selector can also choose to allow
other graphics formats, and accordingly
can change the extension.
The specification calls:
Number name description input output
# EE FILESELL selector DE = ^ default A = error
without spoiling BC = ^ mask name = DE ^
Screen HL = ^ title
# EF FILESELH selector DE = ^ default A = error
with damage BC = ^ mask name = DE ^
Screen HL = ^ title
Printer
The function returns # F0 control code
printera.V register E is given a code number,
in HL - address of buffer for him. In BC sets the maximum
length (B is ignored - should be 0). When control codes placed
in the clipboard, BC (B = 0) contains a number of characters,
and A is 0. If the buffer was too small, BC returns the
required size, and A> 0.Esli control code is not available,
then BC = 0 and A> 0.
Function # F1 sends the requested control code directly to
printer.Sm.takzhe function # F0.
# F2 function equivalent to the command BASIC
COPY.
Function # F3 print screen (256x192), taken from the specified
address.
# F4 function mimics the ZX Printer on a normal character
printer.
# F5 function mimics the ZX Printer dot-matrix printer, but for
a character printer works like the # F4.
Function # F6 is designed for printing text with national
characters. If there are no perekoditoraniya, the equivalent
function # F7. Values 1 .. 5 in register D choose the
character set ISO-8859-D.
Function # F7 sends bytes directly to the printer (control
sequence can be a function of # F0).
Options # F0 .. # F6 service module
{PRINTER.RZX}.
Printer control codes
for the functions # F0 and # F1:
code meaning setting for your printer
Epson FX HP LaserJet
{EPSONFX.RZX} {LASERJET.RZX}
# 00 the number of needles on August 8
# 01 ahead of print 27,65,8?
Screen
# 02 number of points of 224.1?
in the mode1
# 03 choice mode1 27,75,224,1?
# 04 number of points of 192.3?
in mode2
# 05 selection mode2 27,76,192,3?
# 06 code for CR 13 13
# 07 LF code for October 1910
The specification calls:
Number name description input output
# F0 GETPRINT take E = A = error code
kontr.kod HL = ^ buffer BC = codelen
printer BC = buflen code = HL ^
# F1? SETPRINT give E = A = error code
kontr.kod
# F2 DUMP print 22 - A =?
line of the screen
Graphics
# F3? DUMPANY printing HL = address A =?
24 lines
screen graphics
# F4 ZXPRINT print the symbol E = A =?
symbol as
on the ZX Printer
# F5? HLPRINT printing HL = ^ pattern A =?
character, E = symbol
defined by HL
as the ZX Printer
# F6? DEPRINT print D = modificator A =?
symbol E = symbol
with modifier
# F7 LPRINT line E = symbol A =?
printer output
Overlays
Options # F8 .. # FB designed to control overlays. Typically,
overlays are The following levels of the game. Overlay can be
loaded with the function call # F8, indicating
Rooms overlay. Preparation of (feature # F9)
gives the result on server systems and allow to raise the
upload speed (for example, Timex FDD 3000) - is not
neobhodimoy.Zagruzka overlay buffer (function # FA) leads to
accelerate your downloads. This option is ignored when not
RAM for storage. This can be used instead of downloading the
overlays directly into the memory banks (like the games that
run on ZX48, and the ZX128), because buffer overlays are stored
in compressed form and, Also, can be stored in the shadow RAM at
ROM (MB-02). Function # FB removes the overlay from
buffer. All functions return free
buffer space in kilobytes. If free space is greater than 254kB,
returns 255.
The specification calls:
Number name description input output
# F8 OVRLOAD load overlay E = number of A = free
E = 0 mean
main program
# F9 OVRPREPARE load E = number of A = free
overlay to clipboard
only if multitasking
# FA OVRSTORE copy overlay E = number of A = free
the internal buffer
# FB OVRREMOVE remove E = number of A = free
overlay of vnutr.bufera
System calls
Options # FC .. # FF are designed to yield
from the program in the system menu and complete the
program.
Function # FC only causes the system menu. The program can be
continued. # FD function terminates the program after the end
of its work (closes all open files, banks, clears the buffer
overlay, etc.) The function is similar to # FE # FD, but shows
the message you want to exit the menu.
Function # FF is reserved for BASIC interpreter, which causes
her after of the last instruktsii.Eto useless programs ZXVGS.
Normally (without the RSX) word of XPTR # 5C5F copied to CHADD
# 5C5D, # FF placed in ERRNR # 5C3A, and the program continues
with the # 0058 (Processor errors).
The specification calls:
Number name description input output
# FC MENU exit the menu, - A =???
return item
"Continue"
# FD QUIT exit the menu - -
with a message
"Program finished"
# FE FATAL exit the menu DE = ^ text
{Zxvgs@yarek.com}, {http: \ zxvgs.yarek.com}
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