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Matrix PIC Chip Fix –
I was using 12c508a's originally along with 1.5KOhm resistors, which works fine, no problems.
I'm now using 12c508's, and i've had to use 2.2KOhm resistors with these as I was getting no red light with 1.5K ones.
Anyway, ive noticed that unless theres a disc in when the ps2 powers up, then after a few seconds the ps2 powers down, I'm sure this never happened with the 12c508a's with 1.5K resistors.
Check your K point maybe his take a GND
No, K points are fine and I think your missing the point.
With a disc in when it boots up, its fine, but with no disc in, it powers down within 3 seconds.