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Added C-code interfaces for the CBM Kernal functions SCNKEY and UDTIM.

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This commit is contained in:
Greg King
2016-08-07 15:47:45 -04:00
parent d90dff5861
commit 2c03b9a1bc
6 changed files with 119 additions and 8 deletions
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19
libsrc/plus4/kscnkey.s Normal file
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;
; 2002-11-22, Ullrich von Bassewitz
; 2016-08-07, Greg King
;
; SCNKEY replacement function
;
.export SCNKEY
.include "plus4.inc"
.segment "LOWCODE" ; Must go into low memory
.proc SCNKEY
sta ENABLE_ROM ; Enable the ROM
jsr $FF9F ; Call the ROM routine
sta ENABLE_RAM ; Switch back to RAM
rts ; Return to caller
.endproc

19
libsrc/plus4/kudtim.s Normal file
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;
; 2002-11-22, Ullrich von Bassewitz
; 2016-08-07, Greg King
;
; UDTIM replacement function
;
.export UDTIM
.include "plus4.inc"
.segment "LOWCODE" ; Must go into low memory
.proc UDTIM
sta ENABLE_ROM ; Enable the ROM
jsr $FFEA ; Call the ROM routine
sta ENABLE_RAM ; Switch back to RAM
rts ; Return to caller
.endproc