Topic       : The GFA-Basic Compendium
Author      : GFA Systemtechnik GmbH
Version     : GFABasic.HYP v2.98 (12/31/2023)
Subject     : Documentation/Programming
Nodes       : 899
Index Size  : 28056
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
@lang       : 
@default    : Document not found
@help       : Help
@options    : +g -i -s +z
@width      : 75
@hostname   : STRNGSRV
@hostname   : CAB     
@hostname   : HIGHWIRE
@hostname   : THING   
View Ref-FileProgram startup

move.l  4(a7),d0  ;basepage address (prg)
move.l  a0,d0     ;0=prg/<>0 acc (basepage address)
a7                ;prg=stack assigned by os/acc=invalid, no stack!

Accessories are pre-shrunk (MSHRINK) by the OS.
Programs must call MSHRINK themselves.

Initial DTA address = BASEPAGE+128
If you don't move the DTA, the command line will be clobbered.


OS calls

Type    Destroyed       Output    Input     Invalid opcodes
------  --------------  --------  --------  ----------------------------------
AES     none #          paramblk  paramblk  crash (N.Aes pops an alert)
VDI     none #          paramblk  paramblk  crash
BIOS    d0-d2/a0-a2     d0        stack     garbage (MiNT -32)
XBIOS   d0-d2/a0-a2     d0        stack     opcode
GEMDOS  d0-d2/a0-a2     d0        stack     -32
Line-A  d0-d2/a0-a2/a6  +         paramblk  ignored (a6 depends on call made)

# = Noted in the TOS.HYP
+ = Depends on the call made.

Note: Never call the AES in supervisor mode.


FireBee notes:

The TAS instruction causes cache issue on the FireBee. Don't use it!