P-COVOX – Atari COVOX mod by Lotharek

64.00  Tax included




Description

P-COVOX – Atari COVOX mod

Hardware, manuals, FAQ, and other info on manufacturers website – HERE

 

P-COVOX is a very simple device, 4channel, discrete component digital-to-analog converter (DAC) that fits under PIA chip. It isn’t as Hi-Fi as modern sound cards, but its perception may be a lot better than a POKEY  – especially playing MODs or NEO files

 

Main features :

  • easy fitting – one wire in most cases
  • high-quality PCB
  • transparent for Atari OS / Hardware / Ultimate / etc.
  • Equal audio output level on both channels
  • Optional pull-up resistors on DATA LINES / not fitted by default/

INSIDE BOX :

  • P-COVOX

INSTALLATION STEP BY STEP:

If Your PIA chip is NOT socketed:

  • desolder PIA CHIP
  • solder precise socket into its place (supplied)
  • insert P_COVOX
  • Insert back PIA chip to P_COVOX

If Your PIA chip is socketed:

  • remove PIA CHIP
  • insert P_COVOX
  • Insert back PIA CHIP to P_COVOX

 

Connections to be made with small wires:

  • CTRL – select one pin only  to set Covox`s  address page:
    • if you solder CTRL signal to pin 9 of LS138 on Atari board, Covox will be present at $D600
    • if you solder CTRL signal to pin 10 of LS138 on Atari board, Covox will be present at $D600
    • if you solder CTRL signal to pin 7 of LS138 on Atari board, Covox will be present at $D700

O2 signal problems:

  • on the majority of  ATARIs middle and RIGHT  pins of the JP1 connector shall be jumpered/connected. No further actions required
  • if Your sound is distorted, remove the jumper; then  connect the RIGHT pin of JP1 to CPU pin 39

Important note

Connecting Covox audio with stereo out is not a good idea. Covox loudness may be reduced. Thus, LM358 amplifier replacement – U-MIXER is being made to mix 2x pokeys, 2x Covox audio to stereo out, mono out, and RF modulator audio.