Apple-2-SW
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GWRAM.SYSTEM
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Fixed ram2e bug clobbering beginning of RAM disk

This commit is contained in:
Zane Kaminski 2020-08-02 18:30:58 -04:00
parent 2260b3edbb
commit bb0113ae56
1 changed files with 28 additions and 0 deletions
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28
ram2e.c
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@ -55,6 +55,16 @@ static char auxram_detect() {
__asm__("sta $C009"); // Store in ALTZP
__asm__("sta $C073"); // Set RW bank 0
// Save RW bank 0 $00-03
__asm__("lda $00");
__asm__("pha");
__asm__("lda $01");
__asm__("pha");
__asm__("lda $02");
__asm__("pha");
__asm__("lda $03");
__asm__("pha");
// Store 00 FF 55 AA in RW bank 0 ZP
__asm__("lda #$00");
__asm__("sta $00");
@ -81,11 +91,29 @@ static char auxram_detect() {
// Found aux ram card
__asm__("sta $C008"); // Don't store in ALTZP
// Restore RW bank 0 $00-03
__asm__("pla");
__asm__("sta $03");
__asm__("pla");
__asm__("sta $02");
__asm__("pla");
__asm__("sta $01");
__asm__("pla");
__asm__("sta $00");
return true;
// Not found
noramworks:
__asm__("sta $C008"); // Don't store in ALTZP
// Restore RW bank 0 $00-03
__asm__("pla");
__asm__("sta $03");
__asm__("pla");
__asm__("sta $02");
__asm__("pla");
__asm__("sta $01");
__asm__("pla");
__asm__("sta $00");
return false;
}