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P-COVOX is a very simple device, 4 channel, discrete component digital-to-analog converter (DAC) that fits under PIA chip. It isn’t as Hi-Fi as modern sound cards, but it`s 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/
  • ROHS, PB Free
  • all elements top side
  • all resistors 1%
  • this is revised version with improved sound quality and noise ratio reduced to almost zero

 

 IN THE BOX

  • A fully tested and assembled P_COVOX

 

Disclaimer: 

If you are not familiar with soldering or you do not have proper tools, we can install the expansion for you. Please contact us to arrange installation.

If you are installing the device yourself, we will not take any responsibility for any damage to your hardware and the device will NOT be subject of any kind of warranty.

 

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 wire:

  • CTRL - select one of the below pins to set Covox's  address page:
    • if you solder CTRL signal to pin 9 of LS138 on Atari board, Covox will be present at $D500
    • 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 majority of  ATARIs  PIA's O2 signal may be used; nevertheless default position of bottom jumper is CPU O2 pin 39 and additional wire needed
  • You can always move "connection" from bottom  and middle  to top and middle to use o2 (buffered) from PIA chip. In that scenario, additional cable to CPU is not needed. 
  • If you find your sound distorted, please use default position (CPU's O2 / PHI2 signal - not buffered)

 

P_Covox connections

 

PLEASE NOTE:

Connecting Covox audio with stereo out is not a good idea. Covox loudness may be reduced.