I was installing a PSIO switch board in a customers PS1 the other day. When I got it apart I found a strange looking mod chip under the board. Its not exactly a normal design. Has anyone seen one of these before? The big question of course is can it boot backup CDRs.... and so far I haven't tested. I just wanted to install and test the switch board. I'll have a try before sending it back. Perhaps its a 1-off someone made. the customer didn't know anything about it.
Yeah, my feeling too - it's just a 4-wire modchip with the code modified to work with a 4.43MHz clock so you can connect the oscillator output to the subcarrier input on the video encoder. Pin 6 on the video encoder (SCIN) is wired to one of the oscillator pins and pin 7 (PAL/NTSC select) is grounded, so it runs in PAL mode @ 4.43MHz all the time. The other 4 wires are just power, ground, data and gate. So my guess is that it will boot CDRs, but has no stealth capability.
