mirror of
https://github.com/Michaelangel007/apple2_mockingboard.git
synced 2024-10-05 00:57:08 +00:00
134 lines
1.3 KiB
Plaintext
134 lines
1.3 KiB
Plaintext
*PRIMARY ROUTINES
|
|
|
|
*FOR SLOT 4
|
|
|
|
*
|
|
|
|
ORG $9000
|
|
|
|
;ADDRESSES FOR FIRST 6522
|
|
|
|
ORB EQU $C400 ;PORT B
|
|
|
|
ORA EQU $C401 ;PORT A
|
|
|
|
DDRB EQU $C402 ;DATA DIRECTION REGISTER (A)
|
|
|
|
DDRA EQU $C403 ;DATA DIRECTION REGISTER (B)
|
|
|
|
;ADDRESSES FOR SECOND 6522
|
|
|
|
ORB2 EQU $C480 ;PORT B
|
|
|
|
ORA2 EQU $C481 ;PORT A
|
|
|
|
DDRB2 EQU $C482 ;DATA DIRECTION REGISTER (B)
|
|
|
|
DDRA2 EQU $C483 ;DATA DIRECTION REGISTER (A)
|
|
|
|
*
|
|
|
|
*ROUTINES FOR FIRST 6522
|
|
|
|
*
|
|
|
|
INIT LDA #$FF ;SET PORT A FOR OUTPUT
|
|
|
|
STA DDRA
|
|
|
|
LDA #$07 ;SET PORT B FOR OUTPUT
|
|
|
|
STA DDRB
|
|
|
|
RTS ;RETURN
|
|
|
|
*
|
|
|
|
LATCH LDA #$07 ;SEND "LATCH COMMAND"
|
|
|
|
STA ORB ;TO SOUND CHIP
|
|
|
|
LDA #$04 ;THROUGH PORT B
|
|
|
|
STA ORB
|
|
|
|
RTS ;RETURN
|
|
|
|
*
|
|
|
|
WRITE LDA #$06 ;SEND "WRITECOMMAND"
|
|
|
|
STA ORB ;TO SOUND CHIP
|
|
|
|
LDA #$04 ;THROUGHPORT B
|
|
|
|
STA ORB
|
|
|
|
RTS ;RETURN
|
|
|
|
*
|
|
|
|
RESET LDA #$00 ;SEND "RESET COMMAND"
|
|
|
|
STA ORB ;TO SOUND CHIP
|
|
|
|
LDA #$04 ;THROUGH PORT B
|
|
|
|
STA ORB
|
|
|
|
RTS ;RETURN
|
|
|
|
*
|
|
|
|
*ROUTINES FOR SECOND 6522
|
|
|
|
*
|
|
|
|
INIT2 LDA #$FF ;SET PORT A FOR OUTPUT
|
|
|
|
STA DDRA2
|
|
|
|
LDA #$07 ;SET PORT B FOR OUTPUT
|
|
|
|
STA DDRB2
|
|
|
|
RTS ;RETURN
|
|
|
|
*
|
|
|
|
|
|
|
|
LATCH2 LDA #$07 ;SEND "LATCH COMMAND"
|
|
|
|
STA ORB2 ;TO SOUND CHIP
|
|
|
|
LDA #$04 ;THROUGH PORT B
|
|
|
|
STA ORB2
|
|
|
|
RTS ;RETURN
|
|
|
|
*
|
|
|
|
WRITE2 LDA #$06 ;SEND "WRITECOMMAND"
|
|
|
|
STA ORB2 ;TO SOUND CHIP
|
|
|
|
LDA #$04 ;THROUGHPORT B
|
|
|
|
STA ORB2
|
|
|
|
RTS ;RETURN
|
|
|
|
*
|
|
|
|
STA #$00 ;SEND "RESET COMMAND"
|
|
|
|
STA ORB2 ;TO SOUND CHIP
|
|
|
|
LDA #$04 ;THROUGH PORT B
|
|
|
|
STA ORB2
|
|
|
|
RTS ;RETURN
|