Apple-2-SW
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GWRAM.SYSTEM
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Switched to generic command sequence

This commit is contained in:
Zane Kaminski 2020-05-21 19:08:16 -04:00
parent 435f788177
commit e81256a746
1 changed files with 11 additions and 38 deletions
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49
ram2e.c
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@ -16,59 +16,32 @@ static char read_applekey(void) {
return (*((char*)0xC061) | *((char*)0xC062)) & 0x80;
}
static void set_mask_temp(char mask) {
__asm__("ldx %o", mask);
static void ram2e_cmd(char operation, char data) {
// Load operation and data bytes into X and Y registers
// in preparation for command sequence
__asm__("ldx %o", operation);
__asm__("ldy %o", data);
// Command sequence
__asm__("lda #$FF");
__asm__("sta $C073");
__asm__("lda #$00");
__asm__("sta $C073");
__asm__("lda #$55");
__asm__("sta $C073");
__asm__("lda #$AA");
__asm__("sta $C073");
__asm__("lda #$C1");
__asm__("sta $C073");
__asm__("lda #$AD");
__asm__("sta $C073");
__asm__("lda #$E0");
__asm__("sta $C073");
__asm__("stx $C073");
}
static void ufm_bitbang(char bitbang) {
__asm__("ldx %o", bitbang);
__asm__("lda #$FF");
__asm__("sta $C073");
__asm__("lda #$00");
__asm__("sta $C073");
__asm__("lda #$55");
__asm__("sta $C073");
__asm__("lda #$AA");
__asm__("sta $C073");
__asm__("lda #$C1");
__asm__("sta $C073");
__asm__("lda #$AD");
__asm__("sta $C073");
__asm__("lda #$EA");
__asm__("sta $C073");
// Operation
__asm__("stx $C073");
// Data
__asm__("sty $C073");
}
static void set_mask_temp(char mask) { ram2e_cmd(0xE0, mask); }
static void ufm_bitbang(char bitbang) { ram2e_cmd(0xEA, bitbang); }
static void set_nvm(char mask) {
int i;