2022-01-10 04:58:37 +00:00
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;=====================
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;=====================
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;=====================
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2022-01-10 05:47:32 +00:00
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; ay3 write regs
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2022-01-10 04:58:37 +00:00
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;=====================
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;=====================
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;=====================
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2022-01-10 05:47:32 +00:00
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; write all 13 registers
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2022-01-10 04:58:37 +00:00
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; address in X
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; data in A
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2022-01-10 05:47:32 +00:00
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ay3_write_regs:
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ldx #13
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ay3_write_reg_loop:
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2022-01-10 04:58:37 +00:00
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lda #MOCK_AY_LATCH_ADDR ; latch_address for PB1 ; 2
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ldy #MOCK_AY_INACTIVE ; go inactive ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 4
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sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
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sty MOCK_6522_ORB1 ; 4
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; value
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2022-01-10 05:47:32 +00:00
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lda $70,X
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2022-01-10 04:58:37 +00:00
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sta MOCK_6522_ORA1 ; put value on PA1 ; 4
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lda #MOCK_AY_WRITE ; ; 2
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sta MOCK_6522_ORB1 ; write on PB1 ; 4
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sty MOCK_6522_ORB1 ; 4
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2022-01-10 05:47:32 +00:00
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dex
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bpl ay3_write_reg_loop
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2022-01-10 04:58:37 +00:00
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rts
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init_addresses:
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.byte <MOCK_6522_DDRB1,<MOCK_6522_DDRA1 ; set the data direction for all pins of PortA/PortB to be output
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.byte <MOCK_6522_ACR,<MOCK_6522_IER ; Continuous interrupts, clear all interrupts
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.byte <MOCK_6522_IFR,<MOCK_6522_IER ; enable interrupt on timer overflow
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.byte <MOCK_6522_T1CL,<MOCK_6522_T1CH ; set oflow value, start counting
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.byte <MOCK_6522_ORB1,<MOCK_6522_ORB1 ; reset ay-3-8910
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; note, terminated by the $ff below
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init_values:
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.byte $ff,$ff ; set the data direction for all pins of PortA/PortB to be output
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.byte $40,$7f
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.byte $C0,$C0
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.byte $CE,$C7 ; c7ce / 1.023e6 = .050s, 20Hz
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.byte MOCK_AY_RESET,MOCK_AY_INACTIVE
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