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45 lines
770 B
Plaintext
45 lines
770 B
Plaintext
// Hardware addresses for C64
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#if not(CBM_64)
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#warn c64_cia module should be only used on C64-compatible targets
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#endif
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// CIA1
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volatile byte cia1_pra @$DC00
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volatile byte cia1_prb @$DC01
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byte cia1_ddra @$DC02
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byte cia1_ddrb @$DC03
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volatile byte cia2_pra @$DD00
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volatile byte cia2_prb @$DD01
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byte cia2_ddra @$DD02
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byte cia2_ddrb @$DD03
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macro asm void cia_disable_irq() {
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? LDA #$7f
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! LDA $dc0d
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! LDA $dd0d
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! LDA $dc0d
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! LDA $dd0d
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}
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macro void vic_bank_0000() {
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cia2_ddra = 3
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cia2_pra = 3
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}
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macro void vic_bank_4000() {
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cia2_ddra = 3
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cia2_pra = 2
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}
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macro void vic_bank_8000() {
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cia2_ddra = 3
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cia2_pra = 1
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}
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macro void vic_bank_C000() {
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cia2_ddra = 3
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cia2_pra = 0
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}
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