Info Guide #01

Программирование

TR-DOS - Function TR-DOS.

                TR-DOS

            Level 1: 15635
  Alone Coder


   Functions of TR-DOS, called from the Basic
promote the use of not all
system capabilities. The developers have provided a number of 
special functions to work with drive, access to which can occur 
only from the programs in machine code. This so-called <work 
with drive at a high level>, in contrast to

File-level and low, ie direct
guidance controller.

   All of the above functions are performed
one program, the transition to which is carried out at 15,635. 
In fact, in memory cell to the specified address contains the 
NOP / JR, but there is evidence that the transition to at 
15,636 works not on all kinds of Speccy. Parameter for this 
program is to register C processor, which should include a 
number of teams according to the following list: 


      # 5 - Read sectors.

   Count from the current row diskodava B
sectors of 256 bytes and store them at HL. The initial path 
(track) must be contained in D, the starting sector on this 
track - in E. Normally, this function is used in the loader 
monobloc programs. In this case should make LD DE, (23796)

that is, to recall sector number after
the last to read / write block of data, ie in this case for the 
sector akkurat beysikovoy part.


   How to make a one-piece boot? first write just such a BASIC 
program: 

  10 REM 16 pieces of gaps

  20 CLEAR 24575: RANDOMIZE USR 23872
Then, with 23,872 addresses (if you access the TRDOS since the 
last reset was not, then to 23,760) in any way pleasant to you

enter code program:

   LD DE, (23796)

   LD BC, # NN05; where NN = length of code,

   LD HL, ADDR; and this - the load address.

   CALL 15635

   JP START; address of the start code.
It obviously takes up the entire REM. This is the most
simple case - when the code block one and
runs without raspakovki.V more complex
If not, add space after REM and
insert whatever you want.
We write our beysikovuyu prog on disk:
 RANDOMIZE USR 15619: REM: SAVE "IGRA" LINE 10
Behind her butt will charge a code block, after
This load Disk Doctor and fix the length of BASIC file in 
sectors 01 to the total length of BASIC and codes in the first 
symbol code file write code 00, while the 8-th sector to reduce 
the number of code files, bytes Room # E4. The loader is ready, 
and he even kopiruetsya.Konechno better would be a boot-type 

   0 INK USR. 


      # 6 - Record of sectors.

   Put B sectors in a row for the same
pravilam.Sleduet note that these procedures are stopped at 
Break and the message Disk error, etc. to clear the screen. If 
you want it to warn, write first at 23,746 instead of the RET

invoke an error handler.


      # 7 - show directory.

   Equivalent to the CAT team with the exception that the 
output produced in any stream. Stream number set in A (standard 
- 2). It is desirable to write the number drive (23798)

also available at (23 800) and (23,801). Absolutely
useless team.


      # 0 - restore command.

   Drive heads back to the zero track.


      # 1 - Change the drive and testing.

   In case A should be the drive number: 0 = "A", 1 = "B", 2 = 
"C", 3 = "D". Testing - determine the number of tracks (40 or 
80) and the velocity of the magnetic head -

not made, if the drive has already been tested extensively.


   It should be noted that before using these commands to open 
the system variables TR-DOS.Sama such, it after a reset does 
not open, why hang All that I know assemblery.Mozhno enter and

immediately withdraw from the DOS, can also cause
procedure 15649.

   Another unpleasant feature of these procedures is that the 
read / write sectors in a row every time they make an extra 
turn drive the transition to the next physical dorozhku.Etot 
lack of correct numerous TURBO-LOADER'y using direct appeal to 
the floppy drive controller KR1818VG93. 

   The program has 15,635, and other features
but they are few in our teme.Kosnus
finally only one:


      # 13 - Copy descriptor.

   Copies of 16 bytes from the address at HL
23,773 (region descriptor in the system variables TR-DOS). This 
command, you can view codes TR-DOS from programs outside the 
Depending on the version of the system, not including drive