31 Jan
2006
31 Jan
'06
11:23 a.m.
Has anybody built and used Peter McCollum's Qbus RXV11 emulator?
http://www.geocities.com/saipan59/dec/rxv11_emu.html
I saw that somebody on CC is running the Unibus version, and it got
me curious.
Doc
31 Jan
31 Jan
11:55 a.m.
Doc Shipley wrote:
Has anybody built and used Peter McCollum's Qbus
RXV11 emulator?
http://www.geocities.com/saipan59/dec/rxv11_emu.html
I saw that somebody on CC is running the Unibus version, and it got
me curious.
I just got my unibus kit and planned to solder it up in the next few
days. I want to try it on an 11/34a and an 11/44.
If it worksl I plan to try the qbus version. Always nice to have
another boot option.
-brad
1:12 p.m.
In article <43DFB933.5020303 at mdrconsult.com>,
Doc Shipley <doc at mdrconsult.com> writes:
Has anybody built and used Peter McCollum's
Qbus RXV11 emulator?
So with the T-bus wire wrap board, does it already handle the bus
tranceiver stuff? I've been talking off list about techniques for
handling the bus requirements of Q-bus. It looks like you still have
to handle this yourself with a wirewrap board; I'm assuming chips in
the bottom row of <http://www.geocities.com/saipan59/robots/qbus_card.jpg>
are the bus transceivers?
--
"The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ:
<http://www.xmission.com/~legalize/book/>
Pilgrimage: Utah's annual demoparty
<http://pilgrimage.scene.org>
1 Feb
1 Feb
10:30 a.m.
On 1/31/06, Richard <legalize at xmission.com> wrote:
So with the T-bus wire wrap board, does it already
handle the bus
tranceiver stuff? I've been talking off list about techniques for
handling the bus requirements of Q-bus. It looks like you still have
to handle this yourself with a wirewrap board; I'm assuming chips in
the bottom row of <http://www.geocities.com/saipan59/robots/qbus_card.jpg>
are the bus transceivers?
It looks like it to me - from the schematic, he's using old National
chips (8838, etc)... not a bad trick for a one-off, but not so easy to
manage for, say, an new community design. Personally, I collect all
of the NS 8xxx chips I come across (a handful per year), more to
repair old boards than anything else, but someday, if an interesting
design crossed my path, I'd have parts to build one.
-ethan
10:51 a.m.
In article <f4eb766f0602011030k18f7efb0o67f5f0bf6fc00a73 at mail.gmail.com>,
Ethan Dicks <ethan.dicks at gmail.com> writes:
On 1/31/06, Richard <legalize at xmission.com>
wrote:
A batch of these was just offered on ebay; I purchased 5 of the DS8641N
and 10 of the DS8640N. He still had 10 more of the DS8640N in his
auction. I want to make some sort of emulated drive interface for my
11/03 so that I don't have to put wear and tear on the RL01 drives in
order to play with it :-). Plus it would give me access to much
larger storage capacity by using some sort of emulator or whatnot.
--
"The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ:
<http://www.xmission.com/~legalize/book/>
Pilgrimage: Utah's annual demoparty
<http://pilgrimage.scene.org>
[...] I'm assuming chips in
the bottom row of <http://www.geocities.com/saipan59/robots/qbus_card.jpg>
are the bus transceivers?
It looks like it to me - from the schematic, he's using old National
chips (8838, etc)... not a bad trick for a one-off, but not so easy to
manage for, say, an new community design. Personally, I collect all
of the NS 8xxx chips I come across (a handful per year), more to
repair old boards than anything else, but someday, if an interesting
design crossed my path, I'd have parts to build one. 
11:21 a.m.
On Wednesday 01 February 2006 13:51, Richard wrote:
A batch of these was just offered on ebay; I purchased
5 of the
DS8641N and 10 of the DS8640N. He still had 10 more of the DS8640N
in his auction. I want to make some sort of emulated drive interface
for my 11/03 so that I don't have to put wear and tear on the RL01
drives in order to play with it :-). Plus it would give me access to
much larger storage capacity by using some sort of emulator or
whatnot.
I'd suggest that you first look for an RQDX3; they usually show up
fairly cheaply - they support ST506 hard drives, and RX50 and RX33
floppy drives. You can get a Teac FD-55GFR, rejumper it to act like an
RX33, and an ST225/238R (same as a DEC RD31), and have a 1.2MB floppy
drive and a 25MB HDD hanging off of your box pretty cheaply.
On an 11/03, the only "tough" parts will be building the distribution
board that converts the cable from the RQDX3 to the drives, and getting
a boot PROM for MSCP boot (though you *can* use ODT to boot the
machine, it's just a bit painful, but not as painful as toggling in the
bootstrap :).
Actually, an RX33 is nearly 1/4 the (MB) size of an RL01, and probably
close to the same speed. :)
Pat
--
Purdue University Research Computing --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
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5 comments
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participants (5)
-
brad＠heeltoe.com -
doc＠mdrconsult.com -
ethan.dicks＠gmail.com -
legalize＠xmission.com -
pat＠computer-refuge.org