The dos is easy to access from machine code using the internal jump table starting at address 120 in the cartridge.
The jump table is a list of 20 or so entry points to the most often used sub-routines in the dos.
Any changes or different versions of the dos in the future, do not affect these addresses, so utility programs dont need to be modified incase a different version of Lkdos is ever used.
Any machine code program (or Basic program) written for Lkdos is compatible with any Lkdos cartridge useing a different disk interface, (Aerco, Ramex or Oliger).
The routines can be used to load or save complete files or just load or save 1 block etc.
A complete list of all the Subroutines and variables in the Lkdos is supplied with the Disk Editor package. ($10.00)
Note – all numbers in the programs below are in decimal
Two Small Utility Programs for LKDOS
-- Addresses and dos routines used by FREEBL and MOVCAT --
data EQU 8328 - Address of data in the disk buffer
curtrk EQU 8221 - block number for TRACK to seek
-- Commonly used subroutines in the Lkdos jump table --
SAVEBF EQU 120 - Save the buffer to current block
LOADBF EQU 123 - Load the buffer from the cur block
TRACK EQU 126 - Restore to track 0 the seek (curtrk)