13 Apr
2013
13 Apr
'13
4:41 p.m.
On Sat, Apr 13, 2013 at 4:13 PM, William Barnett-Lewis
<wlewisiii at gmail.com> wrote:
A BA23 or BA123 chassis. Would others work as well?
A CPU with separate I/D space. 11/23, 11/53, 11/73, 11/83 or 11/93
would work with the Q-bus chassis above.
1mb to 4mb memory, 1mb is absolute minimum for 2.11 BSD & 4mb is
highly desirable.
Disk controller - though more expensive, sanity really says I should
find a SCSI controller like RQZX1, Emulex UC-7 or CMD CQD-220. I have
old SCSI disks; ESDI & the like? Not so much ...
A RQDX3 & RX50 or TQK70 & TK70 would probably be in the 'nice to
have' category as well.
DELQA ethernet controller
Would this work? What are the going rates for hobbyists (rather than
resellers to those with production equipment)? Are there any, hmm,
less expensive bits here or there?
You can't run 2.11BSD on an 11/23, it doesn't have split I/D space.
For a Q-bus system you need a KDJ11 processor. From what I've seen it
is probably easiest to build an M8192 KDJ11-A or M8190 KDJ11-B system.
An M8190 KDJ11-B will give you a nicer system but you need a Q22/CD
backplane so pretty much a BA23. A BA123 works too but good luck
finding one. An M8192 KDJ11-A will also work in plain Q22 backplane
so that gives you more options, but then you need separate SLUs and
boot ROMs. Sometimes you can find an M7554-SD DECServer 550 CPU in a
BA213 chassis which you can also use as an 11/53.
A ballpark figure might be around $300 for whole system with an M8190
KDJ11-B, (2x) M8637 MSV11-J, CMD CQD-220/TM for disk and tape, and a
BA23 chassis. If you had to buy each pieces separately on eBay you'd
probably pay more than that. Sometimes you can get lucky and someone
is practically giving a whole system away if you are in the right
place at the right time.
-Glen