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botdemo: try to fix glitchy audio

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somehow the fix didn't make it into pt3_lib
This commit is contained in:
Vince Weaver 2020-11-20 00:22:31 -05:00
parent 67eb010eef
commit 0bf1093d11
1 changed files with 24 additions and 9 deletions
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33
bot_demo/pt3_lib_mockingboard_setup.s
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@ -109,36 +109,51 @@ reset_ay_smc4:
; register in X
; value in MB_VALUE
; note the datasheet says 10,000ns (10 cycle) max hold
; time on the write signals. So interleaving write/left
; write might violate that
write_ay_both:
; address
; write left
lda #MOCK_AY_LATCH_ADDR ; latch_address on PB1 ; 2
ldy #MOCK_AY_INACTIVE ; go inactive ; 2
write_ay_smc1:
stx MOCK_6522_ORA1 ; put address on PA1 ; 4
stx MOCK_6522_ORA2 ; put address on PA2 ; 4
lda #MOCK_AY_LATCH_ADDR ; latch_address on PB1 ; 2
write_ay_smc2:
sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
ldy #MOCK_AY_INACTIVE ; go inactive ; 2
write_ay_smc3:
sty MOCK_6522_ORB1 ; 4
sty MOCK_6522_ORB1 ; go inactive ; 4
; write right
stx MOCK_6522_ORA2 ; put address on PA2 ; 4
sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
sty MOCK_6522_ORB2 ; 4
;===========
; 28
; value
lda MB_VALUE ; 3
; write left
write_ay_smc4:
sta MOCK_6522_ORA1 ; put value on PA1 ; 4
sta MOCK_6522_ORA2 ; put value on PA2 ; 4
lda #MOCK_AY_WRITE ; ; 2
write_ay_smc5:
sta MOCK_6522_ORB1 ; write on PB1 ; 4
sta MOCK_6522_ORB2 ; write on PB2 ; 4
write_ay_smc6:
sty MOCK_6522_ORB1 ; 4
lda MB_VALUE ; 3
; write right
sta MOCK_6522_ORA2 ; put value on PA2 ; 4
lda #MOCK_AY_WRITE ; ; 2
sta MOCK_6522_ORB2 ; write on PB2 ; 4
sty MOCK_6522_ORB2 ; 4
;===========
; 29
rts ; 6
;===========