On 11/19/2012 09:18 PM, John Wilson wrote: It's just such an amazingly bad match for that type of hardware architecture. *shudder* Yeah we had it at RPI and it was insanely slow. Sometimes it would drop you during login because it couldn't process your username/password within the 60-second timeout. And the software BS didn't help. The C compiler was High-C and it had all kinds of bugs including choking on its own #include files. Fear. Another side of the same mainframe ran MTS (from UMich) and a lot of people never got over the culture shock, but it sure ran like a bat outta hell! So it wasn't a slow computer, unless they horribly misconfigured the VM AIX/370 was in, I guess. VM tuning is a bit of a black art, even more involved than VMS tuning. (but VM doesn't have autogen ;)) Given the penchant for secrecy in the IBM world, at least compared to the DEC and UNIX worlds, I guess it's pretty conceivable that such things could happen. P.S. I wrote the ROM half of PD.SYS for E11's new PDT-11/150 emulation and now I'm working on the PDT-11/130 (TU58 with mutated DLV11) version for good measure ... but slightly sidetracked attempting Terak stuff. I guess this release is going to be all about the weird LSI-11-based micros! That's gonna be just too much fun. :-) -Dave -- Dave McGuire, AK4HZ New Kensington, PA