PDP-11/94-E

Device registers will be in the range 17760000-17777776 (although toward the top you'd mostly see CPU registers). The RX02 controller (RX211) should be at 17777170-6. Hmm. Well, the same physical board should work in either system (/93 or /94) - and I suspect the ROMs check to see if there's a UNIBUS adapter (KTJ11) there, and declaim the CPU board as a UNIBUS or QBUS, depending. (I.e. I would wonder if there are separate QBUS and UNIBUS ROMs.) That's because I have this bit set that there aren't separate /83 and /84 versions of the KDJ11-B for the two busses, and I would think that the /93 and /94 would likely be the same. (I should read the -B and -E manuals to confirm that.) And I don't think there are separate part numbers for KDJ11-E's for QBUS (/93) and UNIBUS (/94) systems. But I'm not familiar with the ROM contents, so I can't say for sure. When debugging broken hardware, I tend to ignore boot/diagnostic ROMs anyway, and stick to simply what the hardware does (as seen via ODT), as that's a) much less complex, and b) fully documented. (I don't know of any ROM listings, and I'm not about to disassemble them!) So if you can't see the RX211 registers from ODT, let me know, and we'll figure out what to try to see if the KTJ11 is working properly. I'm not sure you can (in hardware terms, that is - and clearly if there's no way to do it in the hardware, the software cannot do so)... although it could be broken. There's a section in the /94 maintainence manual (EK-PDP94-MG-001, available online) about upgrading an -11/84 to an -11/94; you might want to read that to see if there are any gothca's in terms of the cabling, etc. (The console cabling will be an issue, of course, since the KDJ11-B and KDJ11-E use different console connectors on the board - I'm talking about the other cables.) But AFAIK the KDJ11-E (/93 and /94) is a compatible upgrade to the KDJ11-B (/83 and /84), so your plan should work. Noel