Noel, Some more info on my machines... *The DLV11-J: http://gunkies.org/wiki/DLV11-J_asynchronous_serial_line_interface is basically 4 DLV11's rolled into a single dual-width card; that's definitelyan option for Mini-Unix (which apparently supports up to 4 simultaneoususers). They are program compatible with the DHV11, so the driver should 'justwork'. The boards are readily available on eBait; 'glitchworks' (of thisparish) sells replacement cables (quite good, I have several).* I bought a DLV-11J on eBay so that's a starter for my /03 machine. I've also bought an MSV11-DE 32kW memory board. Peter Schranz has confirmed a modification to his RLV12/RL02 emulator to allow it to run on the /03. I'm all set for Mini-Unix on the /03 then! Regarding the KDF11-B: *If yours doesn't have the MMU chip, you're probably SOL; those are very rare.KEF11-A FPU chips are avilable on eBay for modest amounts. * Looks like I'm in luck! My /23+ CPU board does have the MMU installed. I also bought a KEF11-A separately. Glad my wife doesn't know about all these purchases. ;) Paul *Paul Riley* Mo: +86 186 8227 8332 Email: paul@rileyriot.com On Tue, 29 Sep 2020 at 07:23, Noel Chiappa wrote: > > From: Pete Turnbull > > > The SRUNL signal that was mentioned isn't likely to cause a problem > > That was just a guess on my part as to the exact cause. It is definite, > though, that Q22 memory won't work with an LSI-11/2 (M7270); I just tried > it. > I didn't touch any of the other boards; just swapped the LSI-11/2 for a > KDF11-A (M8186), everything worked fine; put the LSI-11/2 back, dead again. > > I'll try an LSI-11 (M7264) tomorrow, make sure it's the same; it and the > LSI-11/2 are similar enough that it should, but it'd be good to confirm it. > > > Then back to trying to work out why Mini-Unix is so fragile for me. Has > anyone else ever worked with Mini-Unix, and if so, any tips? > > Noel >