City #13 29 мая 1999

Программирование

Likbez - a full description and full disassembler ROM (part 8).

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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.



                    continued



              The format of the file descriptor

Bytes 0 - 7 - file name.
Bytes 8 - the file extension.
Bytes 9 - 10 - Codes and arrays address Haulin
                ki, for programs in BASIC - the length of

                file for data files:

                Byte 9 - the block number in the file

                Byte 10 - any, TR-DOS always tired
                establishes 32.
Bytes 11 - 12 - for arrays and codes - the length of the file

                programs in BASIC, the length of
                programs, data files - the length of

                the recorded portion of the block.
byte 13 - length of the file in the sectors.
Byte 14 - Number of the first sector of file.
Byte 15 - number of the first track file.


     Format Descriptor disk (sector 8 track 0)

Bytes 0 - 224 - not used.
Byte 225 - number of the first free sector.
Byte 226 - number of the first free track.
B 227 - Disc Type:

                   22 - 80-track double-sided,

                   23 - 40-track double-sided,

                   24 - 80-track single-sided,

                   25 - 40-track single-sided.
Byte 228 - number of files on the disk vmes
                  those with erased.
Bytes 229 - 230 - the number of free sectors.
B 231 - always 16 - a sign prinadlezhnos
                  Tee drive to TR-DOS.
Bytes 232 - 243 - not used. Bytes 234 - 242

                  TR-DOS fills in byte 32.
Byte 244 - number of deleted files.
Bytes 245 - 252 - the name of the disk.
Bytes 253 - 255 - not used.


             Errors in sub-TR-DOS

 Fatal error:
Errors PEEK POKE - impossible to work with files

                     with the expansion of B and D. Also, do not
                     lzya to work with the last seconds
                     torus of any file.
Error PEEK - after the finish sector

                     many bytes of the following,

                     as specified in the low buy
                     those file length. This error is about
                     hoditsya when used under
                     program 15635.
Errors MAGIC - spoils addresses 23552 and 23553.

                     If the address is 23304

                     238, then to port 32765 downloads
                     Xia number of 23388. Makes 20

                     attempts to write to disk with Zach
                     leennoy slot.
Error RUN - run the code correctly

                     files.
Error PRINT # - When creating a new unit fi
                     la Porte buffer, which is why

                     may fail or CAT #

                     LIST #.
Error RESET - puts at 23,746 to
                     Mandu RET without a system
                     variables TR-DOS.
Failed CAT - If the number of drives 23801

                     and 23,798 different, something happens

                     anything.
Positioning error -

                     not taken into account the rate of 
transition                      substituted drive heads.

 Other errors:

Error selecting drive -

                     not checked drive type,

                     if a variable 255, and if

                     change it, then drive type

                     will always be redefined
                     lyatsya.
Error reading address marker -

                     Ignore the error flag Be
                     is taken from 23,761 instead of 23,831.
Error of all COPY - spoiled variable 23840, and

                     with COPY S - still 23,839.
Errors GO TO - Border color is taken from the 23624.

                     To preserve the length of the name

                     file using the screen, although

                     this is not necessary. When

                     downloading files page by clicking
                     Tie A BREAK or response to the question
                     grew Retry, Abort, Ignore? leads
                     children for anything.
PRINT # mistakes and INPUT # -

                     after the question Retry, Abort,

                     Ignore? or pressing BREAK will
                     children anything.
Failed to configure disk -

                     not checked the possibility of using
                     Use the drive to require
                     emom mode. Completely non
                     correctly processed DISC ER
                     ROR.
Error READ ONLY - when trying to write a 40-doro
                     zhechny disc 80-track dispersion
                     kovode message is right
                     correctly, but in a variable 23823

                     instead of an error code will be copy

                     variable with the type of drive.
Error BREAK - BREAK when you issued with
                     communication BREAK INTO PROGRAM

                     instead of BREAK-CONT REPEATS.


               to be continued ...