|  Hardware - DIGIMUZ | | Name: | DIGIMUZ |
| AKA: | AY-3-8910 Card |
| Category: | SID Card |
| Introduced: | Unknown |
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| | About | Designed and built in Poland by Tadeusz Zawadowski, also author of Copy System +4.
This is an external card plugged into the expansion port, mounting an AY-3-8910 IC. See below about programming the chip.
The only programs that feature music for this card were written by BKP, who is the owner of the Card no. 003. |
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| | Programming | The card can be driven by changing the values in $FD21/22/23:
$FD23 - register number
$FD22 - write to the register
$FD21 - read from the register
| Register / bit | B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | | R0 | Channel A Tone Period | 8-Bit Fine Tune A | | R1 | | 4-Bit Coarse Tune A | | R2 | Channel B Tone Period | 8-Bit Fine Tune B | | R3 | | 4-Bit Coarse Tune B | | R4 | Channel C Tone Period | 8-Bit Fine Tune C | | R5 | | 4-Bit Coarse Tune C | | R6 | Noise period | | 5-Bit Period control | | R7 | Enable (bit 0 = on, 1 = off) | IN/OUT | Noise | Tone | | IOB | IOA | C | B | A | C | B | A | | R8 | Channel A Envelope on/off, Volume | | Env | volume | | R9 | Channel B Envelope on/off, Volume | | Env | volume | | R10 | Channel C Envelope on/off, Volume | | Env | volume | | R11 | Envelope Period | 8-Bit Fine Tune Envelope | | R12 | | 4-Bit Coarse Tune Envelope | | R13 | Envelope Shape/Cycle | | CONT | ATT | ALT | HOLD | | R14 | I/O Port A Data Store | 8-Bit Parallel I/O on Port A | | R15 | I/O Port B Data Store | 8-Bit Parallel I/O on Port B |
A simple example, play a tone on Channel A:
LDX #$07 ;; $FE to register 7 (enable tone A)
LDA #$FE
STX $FD23
STA $FD22
LDX #$08 ;; $0F to register 8 (tone A volume to maximum)
LDA #$0F
STX $FD23
STA $FD22
LDX #$00 ;; $55 to register 0 (tone A freq to $0155)
LDA #$55
STX $FD23
STA $FD22
LDX #$01 ;; $01 to register 1
LDA #$01
STX $FD23
STA $FD22 |
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| | Working Card Video | |
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