15 Oct
1998
15 Oct
'98
8:46 a.m.
On Oct 14, 18:28, Zane H. Healy wrote:
Subject: RE: RX50 / RX33 Questions related to
PDP-11's
That sounds suspiciously like what the controller does to "sniff" an RX50.
There's a bit of majic between the side select and track zero signals on
an RX50, which the controller uses to test that it's a real RX50.
What exactly do your "RX33's" do
when you try to access them?
They flicker briefly just prior to the machine complaining it can't boot.
I'm not sure I had them connected properly. I'll try the method Allison
suggested in a little bit. Well, the stickers are pretty hard to read, but if
I'm looking at the
right
two, they both say
LMB617 or LM8617
then one says 21725 or 217E5
I'm pretty sure the second says 216E5
That's 23-216E5 and 23-217E5, the first version of the RQDX3 code. The
second revision is 23-244E5 and 23-245E5, which I think does support RX33s.
The 23- means a ROM and the E5 means 16Kbytes (ie a 27128 EPROM).
If these aren't ROMs that support RX33's which
ones should I be looking
for, there is a chance one of my other RQDX3's that I've got in my spares
will work.
There was a third version, which was a minor bugfix, 23-285E5 and 23-286E5.
I'm looking for a copy of those for my archive...
--
Pete Peter Turnbull
Dept. of Computer Science
University of York