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SUPER EXTENDED BASIC UNRAVELLED II
APPENDIX G
SUPER EXTENDED BASIC ROM ROUTINES
ORIGIN:SPECTRAL ASSOC
REVISED:12/26/1999 WALTER K ZYDHEK
EXIT CONDITIONS
INIT0 and the video control registers are modified. All CPU registers, except
CC are preserved.
PRGMMU = [E006]
Program the MMU registers with their RAM images.
ENTRY CONDITIONS
None
EXIT CONDITIONS
The MMU registers are modifed. All CPU registers, except CC are preserved.
GETTEXT = [E008]
Place block 6.6 into the RAM image of the Task Register 0 MMU register which
controls logical block 1. Then copy the RAM image of the MMU registers to the
MMU registers. Finally, replace block 6.6 (as saved above) with block 7.1 in
the RAM image of the MMU registers. This is a very special purpose routine
used by Basic to replace the hi-res text screen into the logical address space
so that they may be modified.
ENTRY CONDITIONS
None
EXIT CONDIIIONS
The RAM image of MMU register one of task register 0 and the MMU registers are
modified. All CPU registers, except CC, are preserved.
GETBLOK0 = [E00A]
Place a block into the RAM image of Task Register 0 MMU register which controls
logical block 0. Then copy the RAM image of the MMU registers to the MMU registers. Finally, replace the block (as saved above) with block 7.0 in the RAM
image of the MMU registers. This is a very special purpose routine used by
Basic to place any block into the logical address space so that it may be
modified.
ENTRY CONDITIONS
B contains the block (0-$3F) to be loaded.
EXIT CONDITIONS
The RAM image of the MMU register 0 of task register 0 and the MMU registers
are modifed. Akk CPU registers, except CC, are preserved.
GETTASK0 = [E00C]
Restore task register 0 as the active task register.
ENTRY CONDITIONS
G2