19 Oct
2020
19 Oct
'20
5:20 p.m.
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