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At least one memeory of this mainling list does, me :-) Unfortuantyely, that is not i nthe TechRef. You want the service manaul for that. The TechRef contains the full schematics, system calls, etc. The Service manaul tells you how to interpret the diagnostics, swap boards and the like. Personally, I would want both. The service manual to tell me where to look for the problem and the TechRef to actually find it. Unfortunately I don't have the service manual. But I think that 1xyy errors are DRAM failures. x gives the bank, yy indicates which bits failed (it's an 8 bit bus, rememebr, 8088 CPU). If I am right, that's a problem with bit 0 of bank 2. which is U914 (a 4164 DRAM chip on the mainboard in front of the expansion slots). The HP150-II is painful to take apart, though, The RAMs are not socketed IIRC so the CPU board has to come oput to solder in a new one. That means dismantlign the metalwork, taking off the power switch button, brightness knob and the plasic skins, and then eitehr removing the PSU/montioor board or at least loosening it soe that it cvan be unplugged fro the CPU board. The latter is easier, it avoids havign to disconent the CRT base and anode cap. -tony