mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-27 02:31:00 +00:00
b1238af49d
this will probably upset people
798 lines
21 KiB
ArmAsm
798 lines
21 KiB
ArmAsm
; VMW Chiptune Player
|
|
|
|
.include "zp.inc"
|
|
|
|
;=============================
|
|
; Setup
|
|
;=============================
|
|
|
|
;============================
|
|
; Init the Mockingboard
|
|
;============================
|
|
|
|
jsr mockingboard_init
|
|
jsr reset_ay_both
|
|
jsr clear_ay_both
|
|
|
|
;=========================
|
|
; Setup Interrupt Handler
|
|
;=========================
|
|
; Vector address goes to 0x3fe/0x3ff
|
|
|
|
lda #<interrupt_handler
|
|
sta $03fe
|
|
lda #>interrupt_handler
|
|
sta $03ff
|
|
|
|
;============================
|
|
; Enable 50Hz clock on 6522
|
|
;============================
|
|
|
|
sei ; disable interrupts just in case
|
|
|
|
lda #$40 ; Continuous interrupts, don't touch PB7
|
|
sta $C40B ; ACR register
|
|
lda #$7F ; clear all interrupt flags
|
|
sta $C40E ; IER register (interrupt enable)
|
|
|
|
lda #$C0
|
|
sta $C40D ; IFR: 1100, enable interrupt on timer one oflow
|
|
sta $C40E ; IER: 1100, enable timer one interrupt
|
|
|
|
lda #$E7
|
|
sta $C404 ; write into low-order latch
|
|
lda #$4f
|
|
sta $C405 ; write into high-order latch,
|
|
; load both values into counter
|
|
; clear interrupt and start counting
|
|
; 4fe7 / 1e6 = .020s, 50Hz
|
|
|
|
;==================
|
|
; load first song
|
|
;==================
|
|
|
|
;=========================
|
|
; Init Variables
|
|
;=========================
|
|
|
|
lda #$0
|
|
sta MB_CHUNK_OFFSET
|
|
lda #3
|
|
sta CHUNKSIZE
|
|
|
|
;===========================
|
|
; Load in KRW file
|
|
;===========================
|
|
|
|
lda #<UNPACK_BUFFER ; set input pointer
|
|
sta INL
|
|
lda #>UNPACK_BUFFER
|
|
sta INH
|
|
|
|
|
|
;============================
|
|
; Enable 6502 interrupts
|
|
;============================
|
|
|
|
cli ; clear interrupt mask
|
|
|
|
;============================
|
|
; Loop forever
|
|
;============================
|
|
main_loop:
|
|
|
|
jmp main_loop
|
|
|
|
|
|
|
|
|
|
;=========
|
|
;routines
|
|
;=========
|
|
|
|
; left speaker
|
|
MOCK_6522_ORB1 EQU $C400 ; 6522 #1 port b data
|
|
MOCK_6522_ORA1 EQU $C401 ; 6522 #1 port a data
|
|
MOCK_6522_DDRB1 EQU $C402 ; 6522 #1 data direction port B
|
|
MOCK_6522_DDRA1 EQU $C403 ; 6522 #1 data direction port A
|
|
|
|
; right speaker
|
|
MOCK_6522_ORB2 EQU $C480 ; 6522 #2 port b data
|
|
MOCK_6522_ORA2 EQU $C481 ; 6522 #2 port a data
|
|
MOCK_6522_DDRB2 EQU $C482 ; 6522 #2 data direction port B
|
|
MOCK_6522_DDRA2 EQU $C483 ; 6522 #2 data direction port A
|
|
|
|
; AY-3-8910 commands on port B
|
|
; RESET BDIR BC1
|
|
MOCK_AY_RESET EQU $0 ; 0 0 0
|
|
MOCK_AY_INACTIVE EQU $4 ; 1 0 0
|
|
MOCK_AY_READ EQU $5 ; 1 0 1
|
|
MOCK_AY_WRITE EQU $6 ; 1 1 0
|
|
MOCK_AY_LATCH_ADDR EQU $7 ; 1 1 1
|
|
|
|
|
|
;========================
|
|
; Mockingboard Init
|
|
;========================
|
|
; Initialize the 6522s
|
|
; set the data direction for all pins of PortA/PortB to be output
|
|
|
|
mockingboard_init:
|
|
lda #$ff ; all output (1)
|
|
sta MOCK_6522_DDRB1
|
|
sta MOCK_6522_DDRA1
|
|
sta MOCK_6522_DDRB2
|
|
sta MOCK_6522_DDRA2
|
|
rts
|
|
|
|
;======================
|
|
; Reset Left AY-3-8910
|
|
;======================
|
|
reset_ay_both:
|
|
lda #MOCK_AY_RESET
|
|
sta MOCK_6522_ORB1
|
|
lda #MOCK_AY_INACTIVE
|
|
sta MOCK_6522_ORB1
|
|
|
|
;======================
|
|
; Reset Right AY-3-8910
|
|
;======================
|
|
;reset_ay_right:
|
|
lda #MOCK_AY_RESET
|
|
sta MOCK_6522_ORB2
|
|
lda #MOCK_AY_INACTIVE
|
|
sta MOCK_6522_ORB2
|
|
rts
|
|
|
|
|
|
; Write sequence
|
|
; Inactive -> Latch Address -> Inactive -> Write Data -> Inactive
|
|
|
|
;=========================================
|
|
; Write Right/Left to save value AY-3-8910
|
|
;=========================================
|
|
; register in X
|
|
; value in MB_VALUE
|
|
|
|
write_ay_both:
|
|
; address
|
|
stx MOCK_6522_ORA1 ; put address on PA1 ; 3
|
|
stx MOCK_6522_ORA2 ; put address on PA2 ; 3
|
|
lda #MOCK_AY_LATCH_ADDR ; latch_address on PB1 ; 2
|
|
sta MOCK_6522_ORB1 ; latch_address on PB1 ; 3
|
|
sta MOCK_6522_ORB2 ; latch_address on PB2 ; 3
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 3
|
|
sta MOCK_6522_ORB2 ; 3
|
|
|
|
; value
|
|
lda MB_VALUE ; 3
|
|
sta MOCK_6522_ORA1 ; put value on PA1 ; 3
|
|
sta MOCK_6522_ORA2 ; put value on PA2 ; 3
|
|
lda #MOCK_AY_WRITE ; ; 2
|
|
sta MOCK_6522_ORB1 ; write on PB1 ; 3
|
|
sta MOCK_6522_ORB2 ; write on PB2 ; 3
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 3
|
|
sta MOCK_6522_ORB2 ; 3
|
|
|
|
rts ; 6
|
|
;===========
|
|
; 53
|
|
;=======================================
|
|
; clear ay -- clear all 14 AY registers
|
|
; should silence the card
|
|
;=======================================
|
|
clear_ay_both:
|
|
ldx #14
|
|
lda #0
|
|
sta MB_VALUE
|
|
clear_ay_left_loop:
|
|
jsr write_ay_both
|
|
dex
|
|
bpl clear_ay_left_loop
|
|
rts
|
|
|
|
|
|
|
|
|
|
|
|
;================================
|
|
;================================
|
|
; mockingboard interrupt handler
|
|
;================================
|
|
;================================
|
|
|
|
interrupt_handler:
|
|
pha ; save A ; 3
|
|
; Should we save X and Y too?
|
|
|
|
bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
|
|
|
|
mb_play_music:
|
|
|
|
|
|
;======================================
|
|
; Write frames to Mockingboard
|
|
;======================================
|
|
; actually plays frame loaded at end of
|
|
; last interrupt, so 20ms behind?
|
|
|
|
mb_write_frame:
|
|
|
|
|
|
ldx #0 ; set up reg count ; 2
|
|
;============
|
|
; 2
|
|
|
|
;==================================
|
|
; loop through the 14 registers
|
|
; reading the value, then write out
|
|
;==================================
|
|
|
|
|
|
|
|
; CHANNEL A LOW
|
|
mb_write_loop_0:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_0 ; 3/2nt
|
|
|
|
mb_write_0:
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_0:
|
|
inx ; point to next register ; 2
|
|
|
|
|
|
; CHANNEL A HIGH
|
|
mb_write_loop_1:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_1 ; 3/2nt
|
|
|
|
mb_write_1:
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_1:
|
|
inx ; point to next register ; 2
|
|
|
|
; CHANNEL B LOW
|
|
mb_write_loop_2:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_2 ; 3/2nt
|
|
|
|
mb_write_2:
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_2:
|
|
inx ; point to next register ; 2
|
|
|
|
; CHANNEL B HIGH
|
|
mb_write_loop_3:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_3 ; 3/2nt
|
|
|
|
mb_write_3:
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_3:
|
|
inx ; point to next register ; 2
|
|
|
|
; C CHANNEL LOW
|
|
mb_write_loop_4:
|
|
lda REGISTER_DUMP,X ; load register value ; 4
|
|
cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
beq mb_no_write_4 ; 3/2nt
|
|
|
|
mb_write_4:
|
|
|
|
|
|
; address
|
|
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 for PB1 ; 2
|
|
sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 4
|
|
sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
lda REGISTER_DUMP,X ; load register value ; 4
|
|
sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
lda #MOCK_AY_WRITE ; ; 2
|
|
sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 4
|
|
sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_4:
|
|
inx ; point to next register ; 2
|
|
|
|
; C CHANNEL HIGH
|
|
mb_write_loop_5:
|
|
lda REGISTER_DUMP,X ; load register value ; 4
|
|
cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
beq mb_no_write_5 ; 3/2nt
|
|
|
|
mb_write_5:
|
|
|
|
|
|
; address
|
|
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 for PB1 ; 2
|
|
sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 4
|
|
sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
lda REGISTER_DUMP,X ; load register value ; 4
|
|
sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
lda #MOCK_AY_WRITE ; ; 2
|
|
sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 4
|
|
sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_5:
|
|
inx ; point to next register ; 2
|
|
|
|
; NOISE PERIOD
|
|
mb_write_loop_6:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_6 ; 3/2nt
|
|
|
|
mb_write_6:
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_6:
|
|
inx ; point to next register ; 2
|
|
|
|
; ENABLE
|
|
mb_write_loop_7:
|
|
lda REGISTER_DUMP,X ; load register value ; 4
|
|
cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
beq mb_no_write_7 ; 3/2nt
|
|
|
|
mb_write_7:
|
|
|
|
|
|
; address
|
|
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 for PB1 ; 2
|
|
sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 4
|
|
sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
lda REGISTER_DUMP,X ; load register value ; 4
|
|
sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
lda #MOCK_AY_WRITE ; ; 2
|
|
sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 4
|
|
sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_7:
|
|
inx ; point to next register ; 2
|
|
|
|
; A amplitude
|
|
mb_write_loop_8:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_8 ; 3/2nt
|
|
|
|
mb_write_8:
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_8:
|
|
inx ; point to next register ; 2
|
|
|
|
; B Amplitude
|
|
mb_write_loop_9:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_9 ; 3/2nt
|
|
|
|
mb_write_9:
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
; ;===========
|
|
; 62
|
|
mb_no_write_9:
|
|
inx ; point to next register ; 2
|
|
|
|
; C Amplitude
|
|
mb_write_loop_10:
|
|
lda REGISTER_DUMP,X ; load register value ; 4
|
|
cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
beq mb_no_write_10 ; 3/2nt
|
|
|
|
mb_write_10:
|
|
|
|
|
|
; address
|
|
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 for PB1 ; 2
|
|
sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 4
|
|
sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
lda REGISTER_DUMP,X ; load register value ; 4
|
|
sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
lda #MOCK_AY_WRITE ; ; 2
|
|
sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_ORB1 ; 4
|
|
sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_10:
|
|
inx ; point to next register ; 2
|
|
|
|
mb_write_loop_11:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_11 ; 3/2nt
|
|
|
|
mb_write_11:
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_11:
|
|
inx ; point to next register ; 2
|
|
|
|
mb_write_loop_12:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_12 ; 3/2nt
|
|
|
|
mb_write_12:
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_12:
|
|
inx ; point to next register ; 2
|
|
|
|
;mb_write_loop_13:
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; cmp REGISTER_OLD,X ; compare with old values ; 4
|
|
; beq mb_no_write_13 ; 3/2nt
|
|
|
|
;mb_write_13:
|
|
|
|
; special case R13. If it is 0xff, then don't update
|
|
; otherwise might spuriously reset the envelope settings
|
|
|
|
; cmp #$ff ; 2
|
|
; beq mb_no_write_13 ; 3/2nt
|
|
|
|
|
|
; address
|
|
; 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 for PB1 ; 2
|
|
; sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
|
|
; value
|
|
; lda REGISTER_DUMP,X ; load register value ; 4
|
|
; sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
|
; sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
|
; lda #MOCK_AY_WRITE ; ; 2
|
|
; sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
|
; lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
; sta MOCK_6522_ORB1 ; 4
|
|
; sta MOCK_6522_ORB2 ; 4
|
|
;===========
|
|
; 62
|
|
mb_no_write_13:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;=====================================
|
|
; Copy registers to old
|
|
;=====================================
|
|
ldx #13 ; 2
|
|
mb_reg_copy:
|
|
lda REGISTER_DUMP,X ; load register value ; 4
|
|
sta REGISTER_OLD,X ; compare with old values ; 4
|
|
dex ; 2
|
|
bpl mb_reg_copy ; 2nt/3
|
|
;=============
|
|
; 171
|
|
|
|
;===================================
|
|
; Load all 14 registers in advance
|
|
;===================================
|
|
; note, assuming not cross page boundary, not any slower
|
|
; then loading from zero page?
|
|
|
|
mb_load_values:
|
|
|
|
ldx #0 ; set up reg count ; 2
|
|
ldy MB_CHUNK_OFFSET ; get chunk offset ; 3
|
|
;=============
|
|
; 5
|
|
|
|
mb_load_loop:
|
|
lda (INL),y ; load register value ; 5
|
|
sta REGISTER_DUMP,X ; 4
|
|
;============
|
|
; 9
|
|
;====================
|
|
; point to next page
|
|
;====================
|
|
|
|
clc ; point to next interleaved ; 2
|
|
lda INH ; page by adding CHUNKSIZE (3/1); 3
|
|
adc CHUNKSIZE ; 3
|
|
sta INH ; 3
|
|
|
|
inx ; point to next register ; 2
|
|
cpx #14 ; if 14 we're done ; 2
|
|
bmi mb_load_loop ; otherwise, loop ; 3/2nt
|
|
;============
|
|
; 18
|
|
|
|
|
|
|
|
;==============================================
|
|
; incremement offset. If 0 move to next chunk
|
|
;==============================================
|
|
|
|
increment_offset:
|
|
|
|
inc MB_CHUNK_OFFSET ; increment offset ; 5
|
|
|
|
lda #0 ; 2
|
|
clc ; 2
|
|
adc #>UNPACK_BUFFER ; in proper chunk 1 or 2 ; 2
|
|
sta INH ; update r0 pointer ; 3
|
|
|
|
|
|
|
|
;=================================
|
|
; Finally done with this interrupt
|
|
;=================================
|
|
|
|
done_interrupt:
|
|
pla ; restore a ; 4
|
|
rti ; return from interrupt ; 6
|
|
|
|
|
|
REGISTER_OLD:
|
|
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
|
|
|
.align 256
|
|
UNPACK_BUFFER:
|
|
.incbin "sdemo.raw"
|