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Thanks!

Have you seen the "Service Manual" here: http://www.colorcomputerarchive.com/coc ... ndy%29.pdf ?

Maybe i should simply order the 2x 10x diodes... Then i can build 2x 4x antiparallel combinations, so i can drop between 0,7V and 2,8V (4x combinations) om both directions on A1 and A2...

Then i can try to find the highest number of serial combinations that is stable usable...

Think this is the easiest way...

jedie wrote:Have you seen the "Service Manual" here: http://www.colorcomputerarchive.com/coc ... ndy%29.pdf ?

I did see that one thanks. Unfortunately it doesn't have any information on PAL Cocos.

I ordered 10 Diods and a rectifier...

jedie, did you try out with more diodes to see what is the minimal voltage? I am thinking of using an external single-ended DC supply and to add a little voltage inverter for the negative supply to the SALT chip. The manual says the negative voltage is only used for the serial port, but when experimenting with a friend's CoCo2 it seems it was also needed for the tape input (level crossing detection).