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blondie7575/f18avrambyte

Created July 30, 2019 00:15
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f18avrambyte
;;;;;;;;;;;;;;;;;;;;;;;
; graphicsVramWriteByte
; PARAM1 : Destination VRAM address in F18A, high 2 bits must be 01
; X : Byte to write
;
; Write a single byte to F18A's VRAM
;
graphicsVramWriteByte:
SAVE_AX
; Set up F18A address register
lda PARAM1_L
sta F18AREG1
lda PARAM1_H
sta F18AREG1
; Write the byte
stx F18AREG0
RESTORE_AX
rts
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