[Soy]

Why did you remove and replace the PROM?

Error (red-blinking) indicates a fault around a memory sub-system (ex. SIMM). I tried to replace SIMMs with others, then did not change the red-blinking. So, I had doubt the PROM which is seemed a memory mapped ROM for a memory controller (There is no blinking and boot-sound when I remove CPU, so I think that PROM is read at the booting by CPU).

I replaced the PROM with new one, but still same error is occurred. After all, PROM has not any problem. So, I have changed PROM to old one now (after this same error is of course still occurred). If system without SIMM(s) can boot and make boot-sound then the system board itself have some problem. But if system without SIMM(s) can not boot and red-blinking, then system board is seemed that has no problem. I tried to separate problem to sub-problems, and I checked every sub-problem.

I do not doubt SCSI2SD (I have two units), because the booting does not displaying any message and there is no boot-sound, the error is happen before booting the system I think (SCSI device itself is separated from system, and "hinv" command shows valid SCSI devices after booting, because diagnosis routine works before system boot, and this routine detects the error in my case).

Best,
Soy