6418



6418           1912           CLMJMP
     Test to see if DOS must load MEM.SAV from the disk before it
     does a run at cartridge address, then jumps to the cartridge
     address.

6432           1920           LMTR
     Test to see if DOS must load MEM.SAV before it performs a run at
     address command from the DOS menu.

6457           1939           LDMEM
     MEMSAVE load routines (for the MEM.SAV file).

6518           1979           INITIO
     DUP.SYS warmstart entry. An excellent program to eliminate the
     need for DUP.SYS and MEM.SAV (not to mention the time
     required to load them!) was presented in COMPUTE!, July 1982,
     called MicroDOS; it's well worth examining. See also "The Atari
     Wedge," COMPUTE!, December 1982.

663C           19E6           ISRODN
     Start of the serial interrupt service routine to output data needed
     routines in DUP.SYS.

6691           1A23           ISRSIR
     Start of the serial interrupt ready service routines in DUP.SYS.

6781           1A7D           ....
     Start of the drive and data buffers. Drive buffers are numbered
     sequentially one to four, data buffers one to eight, assuming that
     many are allocated for each. Normally, the first two buffers are
     allocated for drives and the next three for data. Buffers are 128
     ($80) bytes long each and start at 6908 ($1AFC), 7036 ($1B7C),
     7162 ($1BFA) and 7292 ($1C7C). See locations 1801 and 1802
     ($709, $70A).

7420           1CFC           ....
     MEMLO (743, 744; $2E7, $2E8) points here when DOS is resident
     unless the buffer allocation has been altered. MEMLO will point
     to 7164 for a one drive, two data buffer setup, a saving of 256
     bytes. Loading the RS-232 handler from the 850 Interface will
     move MEMLO up another 1728 bytes. The RS-232 handler in the
     850 Interface will only boot (load into memory) if you first boot
     the AUTORUN.SYS file on your Atari master diskette or use
     another RS-232 boot program such as a terminal package. The
     RS-232 handler will boot up into memory if you do not have a disk
     attached and you have turned it on before turning on the
     computer. You may still use the printer (parallel) port on the 850
     even if the RS-232 handler is not booted.