On 10/19/2020 6:10 PM, Noel Chiappa via cctalk wrote:
> Time to stop trying random things and drop the (metaphorical) Big
> Hammer.

Well, yeah. Although my methods are *not* random, what I have been doing is trying to set the 11/24 and it's peripherals to a known working base state. Unibus can get annoyed at a lot of things (lack of termination, 4 kinds of Unibus (well 5 if you consider the 11/45), and a whole lot of general weirdness.

Q-Bus is much simpler, although there is 18 and 22 bit and the weird CD interconnect to watch out for, you don't need a terminator and with very few exceptions (RKV11, RL01 dual controller, very early memory that wanted external refresh) things pretty much work bus-wise.

> "Internal addresses; i.e. serial line unit registers .. There is no
> external bus cycle performed for an internal address."

Yeah, the serial ports I think are emulated-ish on the main board. If I could disable them I could do a normal DL11 and see what I see, but that won't work. Maybe I'll just drag out the 11/05 and get that working first, it's got a nice front panel that doesn't lock up often :-)

But if someone has an 11/24 and can cross-check my switch settings to see if I missed something I would appreciate.

CZ

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