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optimize mockingboard code

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Peter Ferrie 2019-06-01 00:07:00 -04:00 committed by Vince Weaver
parent 49e1ce4fd7
commit 79e7fca824
1 changed files with 36 additions and 0 deletions
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36
pt3_player/mockingboard_a.s
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@ -66,6 +66,7 @@ reset_ay_both:
; Reset Right AY-3-8910
;======================
;reset_ay_right:
;could be merged with both
lda #MOCK_AY_RESET
sta MOCK_6522_ORB2
lda #MOCK_AY_INACTIVE
@ -164,6 +165,41 @@ mb_not_in_this_slot:
ldx #00
beq done_mb_detect
;alternative MB detection from Nox Archaist
; lda #$04
; sta MB_ADDRL
; ldx #$c7
;
;find_mb:
; stx MB_ADDRH
;
; ;detect sound I
;
; sec
; ldy #$00
; lda (MB_ADDRL), y
; sbc (MB_ADDRL), y
; cmp #$05
; beq found_mb
; dex
; cpx #$c0
; bne find_mb
; ldx #$00 ;no mockingboard found
; rts
;
;found_mb:
; ldx #$01 ;mockingboard found
; rts
;
; ;optionally detect sound II
;
; sec
; ldy #$80
; lda (MB_ADDRL), y
; sbc (MB_ADDRL), y
; cmp #$05
; beq found_mb
;=======================================
; Detect a Mockingboard card in Slot4