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ZX Forum #04
19 ноября 1997 |
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Technology sprites - Part 2: The hunt for sprites (search and pulling).
HUNTING
Let us go with you
hunting, and hunting it is ...
It was just that this is our hunting unusual: we will hunt you
for sprites. What do we
need? It's very simple.
Get the scoop on their old times
drive and locate the 1.2 software
that you moved from the tape, or you know exactly what they
not protected by our craftsmen.
Define "virgin" (unless
that MAGIC'om poporchenuyu) program is simple - it likely will
not boot when jumping lines with greetings or labels such as
"CRACKET BY ...". Other programs we do not fit, as they are
compressed, protected, and we simply do not find them.
Now it is necessary to arm. I
for example, took a not very
new, but I tested and distributed Inforkomom Program File dump
editor. This very useful program, and through her we can easily
find sprites in your programs. If you have
do not have it, then look for
on the drive any other, capable of browsing and searching in
programs sprites. For those who have
who generally do not have any programs that I offer my own. You
should assemble it in the area memory, which definitely will
not be overwritten're viewing unit
(Best of 3 third of the screen,
as She deliberately did not use the program). Then you should
download the program block and run the viewer.
After starting the program you
will see the following keys:
1 - Switch modes -
character / sprite.
Q - Reduces the address of view
1 byte.
A - Increases the address of view
1.
O - Reduces the size of the maps the
emogo windows in length by 1.
P - Increases the size of the map
isplay window at 1.
SPACE - Exit to BASIC.
Q + SHIFT - Reduces the address space
Despite the 256.
A + SHIFT - Increases address
viewing on the 256.
Initially, the address set
A font ROM and the mode
view symbols. You will be able
find with this program
sprites almost all formats.
Program size is very small. You can also improve
its discretion by increasing the number of keys. The program is
written to the assembler TASM, but its just a remake
for other assemblers.
140.
ORG # 61A8; Address assemble.
UNPHASE; Replacement ENT, but TASM'a.
PHASE 20480; This team assembles everything that we find
; Reduces her, the address that follows
the
; It, in our case in the 3 third of the
screen, but
; Code puts the address of ORG.
EI; Enabling interrupts.
XOR A; Making a Border black.
OUT (# FE), A
INC A; The variable FLAG output mode sprites
; On the screen - 1 Print characters 0 -
valid Thou.
LD (FLAG), A
LD A, # 20; In LEN fills the current window size in
width ; Well.
LD (LEN), A
LD HL, # 3D00; now variable VRAM memory address
, From which we print on screen
; Wounds.
LD (VRAM), HL
CALL SETSP; Draw on the screen the contents of memory.
KEY XOR A; In a variable key pressed enters 0.
LD (# 5C08), A
LD BC, # 0000 pause before pressing any key.
CALL # 1F3D
LD A, (# 5C08); Read the contents of the variable.
CP # 31; if you press "1" - there is a switching
; Output modes sprites.
JR Z, SETFLAG
CP # 71, if you press "q" (small) - reduces
'S address to the viewer 1.
JR Z, UP1
CP # 61; if you press "a" (small) - Increases
'S address to the viewer 1.
JR Z, DOWN1
CP # 51, if you press "Q" (large) - Reduces the hell
; Res viewing at # 0100.
JR Z, UP256
CP # 41, if you press "A" (large) - Increases
'S address to the viewer # 0100.
JR Z, DOWN256
CP # 20; Pressing the space bar exits
; Program.
RET Z
CP # 6F; if you press "o" (small) - reduces
, The size of the window.
JR Z, DECR
CP # 70, if you press "p" (tiny) - increase
, The window size.
JR Z, INCR
JR KEY; If reaped another transition to a survey of the
keys. SETFLAG LD A, (FLAG); invert flag.
XOR # 01
LD (FLAG), A
JR KEY-3
UP1 LD HL, (VRAM); following procedures increase /
; Address view.
DEC HL
LD (VRAM), HL
JR KEY-3
DOWN1 LD HL, (VRAM)
INC HL
JR UP1 +4
UP256 LD HL, (VRAM)
LD DE, # 0100
AND A
SBC HL, DE
JR UP1 +4
DOWN256 LD HL, (VRAM)
LD DE, # 0100
ADD HL, DE
JR UP1 +4
DECR LD A, (LEN); following procedures increase /
, The size of the window.
CP # 01
JR Z, KEY
DEC A
LD (LEN), A
JR KEY-3
INCR LD A, (LEN)
CP # 20
JR Z, KEY
INC A
LD (LEN), A
JR KEY-3
SETSP CALL CLS; Call window cleaning.
LD A, (FLAG)
DEC A
JR Z, CHR; If 1, print characters, otherwise - sprites.
LD HL, # 4000; address of the beginning screen.
LD DE, (VRAM); memory address.
LD B, # 80, window size in the height of 128 pixels (16
* 8). SPR1 PUSH HL
LD A, (LEN); Writes in the C window size in length.
LD C, A; then print the sprite.
SPR2 LD A, (DE)
LD (HL), A
INC DE
INC HL
DEC C
JR NZ, SPR2
POP HL
CALL DOWN
DJNZ SPR1
RET
DOWN INC H; Go to the next pixel line
; Below.
LD A, H
AND # 07
RET NZ
LD A, L
ADD A, # 20
LD L, A
RET C
LD A, H
SUB # 08
LD H, A
RET
CHR LD HL, # 4000; Address 1 third of the screen.
LD DE, (VRAM); In DE puts the address in memory.
CALL CHRSET; Fill in the first third.
LD HL, # 4800; address the second third.
CALL CHRSET; fill it.
RET
CHRSET LD B, # 08; This procedure fills a third of the screen
Sim ; Oxen.
CHR1 PUSH HL
LD A, (LEN)
LD C, A
CHR2 PUSH BC
PUSH HL
LD B, # 08
CHR3 LD A, (DE)
LD (HL), A
INC H
INC DE
DJNZ CHR3
POP HL
POP BC
INC HL
DEC C
JR NZ, CHR2
POP HL
PUSH DE
LD DE, # 0020
ADD HL, DE
POP DE
DJNZ CHR1
RET
CLS LD HL, # 5800, First paint the entire screen color
; INK 0, PAPER 0.
PUSH HL
LD DE, # 5801
LD BC, # 02FF
LD (HL), # 00
LDIR
POP HL; then makes the visible part of the screen to
; Thoraya falls out the window.
LD B, # 10
CLS1 PUSH HL
LD A, (LEN)
LD C, A
CLS2 LD (HL), # 0F
INC HL
DEC C
JR NZ, CLS2
POP HL
LD DE, # 20
ADD HL, DE
DJNZ CLS1
RET
FLAG NOP; variable that stores the index formula
; Mat printing.
VRAM DEFW # 0000 variable that stores the memory address
LEN NOP; variable that stores the window size in
; Length.
2
Well, the weapon is chosen, and
we begin the hunt. What we
need to find? Sprites. Increasing or decreasing address view
and resizing the window, locate the
Playing pictures, pre-translated in the viewer
view sprites.
To view I took a few programs from the collection: 3D BATMAN
(OCEAN), ELEFANT1 (CODE MASTERS), JACK THE NIPPER-2, KRAKOUT.
Let's see, what I had in them find. The first three sprite I
found in a search mode, sprites, and sprite from the program
was KRAKOUT found in the character display mode.
Actually, on this our hunt is over and we gradually move to
the next chapter, which explained to us what we found.
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В этот день... 21 November