P-COVOX: Digital to Analog Converter

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 it`s perceptiom 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    INSIDE BOX : A fully tested and assembled P_COVOX   INSTALLATION STEP BY STEP: Disclaimer: If you are not familiar with soldering or you do not have proper tools, please LET a pro technician do it for you or send me your ATARI BOARD for installation. Upgrade installation cost is 10€ only. Contact me to arrange installation. Otherwise, please remeber - wrong tools usage or low skills may damage atari and ultimate; any damage/harm to your hardware is NOT subject of any kind of warranty.   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 pin 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 majority of  ATARIs middle and RIGHT  pins of JP1 connector shall be jumpered / connected. No further actions required if Your sound is distorted, remove the jumper; then  connect RIGHT pin of JP1 to CPU pin 39