Likbez - full description + full disassembler ROM (part 1).
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LIKBEZ
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(C) P. Yu Fedin
FULL DESCRIPTION + FULL ROM Disassembler
TR-DOS 5.04T (5.03)
For professionals
And as for those
WHO WANTS TO BE.
Introduction.
In our country, from all existing disk interface has spread
BETADISC interface with the disk operating system, TR-DOS firm
Technology Research Ltd. This system has many advantages over
the system using as external memory tape. Operating
system is in the shadow ROM and uses 112
bytes of RAM to accommodate the system
variables, and during operation with the directory drive yet,
and a buffer size of 257 baytov.Pri This system is compatible
with the mythical device known as the Interface 1. This version
TR-DOS was made in 1991 by CRAFT.
Disks and disk drives.
Interface supports single-disk drives and
Dual-density, single and double sided. But different versions
of the TR-DOS impose restrictions on the parameters of the
drives. With the TR-DOS 5.04T work only drives to move the head
6 times ms. Note also that different types of drives are not
always compatible between soboy.Stepen compatibility shown in
the table below:
Drives
Disc format
SD, SS SD, DS DD, SS DD, DS
SD, SS C? N N
SD, DS C C N N
DD, SS R? C?
DD, DS R R C C
Here:
SD - 40-track
DD - 80-track
SS - single-sided
DS - double-sided
C - fully compatible
R - compatible only when reading
N - is not compatible at all
? - Inconsistent, but some drives may
be compatible
Startup.
If TRDOS starts at address 0 (after pressing
RESET in the 48K computer or software), then
initializing the computer system selects the drive
A and tries to download it and run beysikprogrammu "boot". If
there is no disk in the drive or disc does not have this
program, then displays tip and TR-DOS passes to the input mode
commands.
Warning: Do not leave the disc in the drive when you turn on
or turn off the power, as it can be spoiled!
AutoCheck drives.
When the first call to drive TR-DOS will automatically check
its parameters and stores the relevant system variables.
Determined by the velocity of the drive heads and the number of
tracks.
Warning: In the routine has an error (a complete list of
error ROM TR-DOS, see the end of the description).
A short list of commands TR-DOS 5.04T.
Team Functions
* Set the default drive
40 Informs the TR-DOS, the drive 40-dor.
80 Informs the TR-DOS, the drive 80-dor.
CAT output directory disk
CLOSE # Closing Data File
COPY Copy files with two drives
COPY S Copying a file on one drive
COPY B Copy the entire disk with a floppy drive
ERASE Erase files
GO TO Run the file, obtained by
Button MAGIC
LIST output expanded catalog drive
LOAD File Download
MERGE Merge program in BASIC
MOVE packing space
NEW: Rename a File
OPEN # Open data file
PEEK Reading sector file
POKE recording sector file
RETURN Return from TR-DOS
RUN Running Programs
SAVE Record File
VERIFY A comparison of the files on disk and in memory
The command syntax.
TR-DOS - flexible and you can access it from BASIC and
machine code. When the shell is waiting for TR-DOS commands
from you, you see a hint in the form of the name of the drive
and direction. If the command fails, then the following
prompt will display the old team, you
can edit and re-enter. Most
commands after the return of control TR-DOS, but
There are exceptions, which are described in the descriptions
commands.
All command parameters are written the same way as in
BASIC. That is, string constants must be
quoted parameters can be variables, functions, expressions, and
so on.
Returning from a TR-DOS in BASIC.
To return from the TR-DOS command is RETURN. Input format
commands: RETURN
Go to the TR-DOS from BASIC.
To enter the command processor TR-DOS you need to call a
subroutine in machine code at address 15616.
For example:
RANDOMIZE USR 15616
Executing commands TR-DOS from BASIC.
In order to run TR-DOS, while in BASIC, before the command
must be written with a prefix: RANDOMIZE USR 15619: REM:
In this case, after the team returns to work in BASIC,
although there are exceptions on occasion.
In this command TR-DOS should be the last in
line program in BASIC, but after it can follow the comment.
Rules for writing comments in the TR-DOS commands, you will
find descriptions of commands.
USR 15619 function returns an error code TR-DOS
(Contents of variable 23 823). A full list of codes
errors can be found at the end of the description.
Selecting the drive by default.
Drive by default - is the drive to which
will address the team, without a specified
drive. After initialization, the default drive A.
TR-DOS supports 4 drives (A, B, C, D). The format of commands
to change the default drive following:
*
The name of the drive - a string of which is taken
first character (A, B, C or D).
Temporary drive select.
Permanently alter the drive by default - it is
long and inconvenient. Therefore, in most commands, you can
specify the drive to which team will have access. To this end,
before the file name should be written the name of the drive
with a colon, for example: LOAD "B: PROGRAM"
If the command does not require a file name, the name
drive with a colon appears after it:
CAT "B:"
To be continued ...
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Likbez - full description + full disassembler ROM (part 1).
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