dos33fsprogs/music/tiny_tracker6/mockingboard_constants.s
2022-11-09 22:21:25 -05:00

22 lines
792 B
ArmAsm

init_addresses:
.byte <MOCK_6522_DDRB1,<MOCK_6522_DDRA1 ; set the data direction for all pins of PortA/PortB to be output
.byte <MOCK_6522_ACR,<MOCK_6522_IER ; Continuous interrupts, clear all interrupts
.byte <MOCK_6522_IFR,<MOCK_6522_IER ; enable interrupt on timer overflow
.byte <MOCK_6522_T1CL,<MOCK_6522_T1CH ; set oflow value, start counting
.byte <MOCK_6522_ORB1,<MOCK_6522_ORB1 ; reset ay-3-8910
; note, terminated by the $ff below
init_values:
.byte $ff,$ff ; set the data direction for all pins of PortA/PortB to be output
.byte $40,$7f
.byte $C0,$C0
.byte $e7,$4f ; c7ce / 1.023e6 = .050s, 20Hz
.byte MOCK_AY_RESET,MOCK_AY_INACTIVE
; c7ce / 1.023e6 = .050s, 20Hz
; 9c40 / 1.023e6 = .040s, 25Hz
; 4fe7 / 1.023e6 = .020s, 50Hz
; 411a / 1.023e6 = .016s, 60Hz