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38 lines
866 B
ArmAsm
38 lines
866 B
ArmAsm
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.include "astrocade.inc"
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;;; C functions
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.area _CODE_ACLIB
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; set entire palette at once (8 bytes to port 0xb)
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; bytes in array should be in reverse
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;void set_palette(byte palette[8]) __z88dk_fastcall {
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.globl _set_palette
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_set_palette:
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ld bc,#0x80b ; B -> 8, C -> 0xb
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otir ; write C bytes from HL to port[B]
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ret
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; set entire sound registers at once (8 bytes to port 0x18)
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; bytes in array should be in reverse
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;void set_sound_registers(byte regs[8]) __z88dk_fastcall {
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.globl _set_sound_registers
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_set_sound_registers:
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ld bc,#0x818 ; B -> 8, C -> 0x18
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otir ; write C bytes from HL to port[B]
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ret
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; set interrupt vector
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; pass address of 16-bit pointer to routine
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.globl _set_interrupt_vector
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_set_interrupt_vector:
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di
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ld a,l
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out (INFBK),a
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ld a,h ; upper 8 bits of address
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ld i,a ; -> I
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im 2 ; mode 2
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ei ; enable interrupts
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ret
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