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22 lines
562 B
ArmAsm
22 lines
562 B
ArmAsm
;
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; 2019-10-22, Greg King
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;
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; void fastcall vpoke (unsigned char data, unsigned long addr);
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; /* Put a byte into a location in VERA's internal address space.
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; ** (addr is second instead of first for the sake of code efficiency.)
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; */
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;
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.export _vpoke
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.import vset, popa
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.include "cx16.inc"
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_vpoke: php ; (vset blocks interrupts)
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jsr vset ; put VERA's address
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jsr popa
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sta VERA::DATA0 ; write data to VERA port zero
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plp
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rts
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