On Thu, 22 May 2014, Johnny Billquist wrote: On 2014-05-22 14:20, Cory Smelosky wrote: On Thu, 22 May 2014, Johnny Billquist wrote: I've never seen a board with the ability to disable parity... It's a clearpoint board. Technically it's just disabling the parity circuitry CSR. The "***EXEC PARITY ERROR STOP***" message is when you get a parity error in the memory where the kernel resides. RSX can deal with memory errors in other parts of the memory, by just making that memory unavailable for programs to use. But it cannot do this with the parts that the kernel use, so then it panics instead. Ahh. Damn. I'd be okay if the only other memory board I had spare wasn't PMI. PMI? As the the PMI memory boards for the 11/83? Yup! Did you know that those memory boards work just fine as normal Qbus memory boards? :-) THAT I did not know! Looks like I have a spare. There's that 16K board...I could adjust the memory offsets. Ugh! 16K is not much... Nope...but MAYBE just enough to fit the lower bits of the executive? First bugcheck is essentially an illegal instruction in kernel mode. (Error code=110 is illegal instruction, while facility=300 means the executive.) Ahh. No idea why you got that one, though, unless it was a fallout of bad memory... Could very be fallout of bad memory. Johnny -- Cory Smelosky http://gewt.net Personal stuff http://gimme-sympathy.org Projects