Hi,
-----Original Message-----
From: Chuck McManis <cmcmanis(a)mcmanis.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Tuesday, May 04, 1999 11:16 PM
Subject: KA650 & uVAX
>I've heard its possible to "upgrade" a uVAX II to a uVAX III by replacing
>the KA-630 with the KA-650 CPU. Now I've looked at a KA-650 and it has a
>metal cover over its end and a small RJ-xx like plug in it. The KA-630 has
>two IDC connectors that go to the 630CNF console plug in the BA123 world
>box.
If you try to use the BA123 again, simply use the 630 cnf console. If you
remove the metal cover from the ka650, you see the flat ribbon connectors
for it.
I use here some of my KA650 in BA23 & BA123 enclosures.
> Do I also need a conversion kit for the KA-650 or is the CPU with
>connectors hiding behind this metal facade?
No.
Have fun,
emanuel
Hi,
-----Original Message-----
From: Pete Turnbull <pete(a)dunnington.u-net.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Tuesday, May 04, 1999 9:16 PM
Subject: Re: Emulex board question
>The boards are identical. The difference is in the firmware. If Emanuel's
>information about an SC02/L is correct, then there at least *four*
>versions, because:
>
> SC02/A RP11 emulation, compatible with RP02/3 disks
> SC02/B RH11 emulation, compatible with RM02/3 disks
> SC02/C RK611 emulation, compatible with RK06/7 disks
>
>These are the only ones I've seen in Emulex docs. There are similar
WOW ;-))
>However, the original enquiry was about a SCO210101-CXL, which is an
>SC02/C.
>Dan was correct.
I can live with that ;-))
So i always had a SC02/C and thought it emulates Rl02/RL03,
so i never put disks on it :-((
cheers,
emanuel
On May 4, 8:34, emanuel stiebler wrote:
> Correction, directly from the manual. RL01 or RL02 emulation ;-))
>
> But serious, there are two version of the SC02 board. The SC02/L emulates
> the Rl01/Rl02 disks, and the SC02/C emulates the RK06/RK07 disks.
>
> Looks to me, that the big difference is in software, because both of
these
> boards look very similar.
The boards are identical. The difference is in the firmware. If Emanuel's
information about an SC02/L is correct, then there at least *four*
versions, because:
SC02/A RP11 emulation, compatible with RP02/3 disks
SC02/B RH11 emulation, compatible with RM02/3 disks
SC02/C RK611 emulation, compatible with RK06/7 disks
These are the only ones I've seen in Emulex docs. There are similar
versions of the SC03, which also has a /MS variant, which supports MSCP. I
assume there are similar variants of the SC12, which is the Unibus version.
However, the original enquiry was about a SCO210101-CXL, which is an
SC02/C.
Dan was correct.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Hi all,
I went scrounging today and found some interesting cards. A picture of
the first one is at "http://www.intellistar.net/~rigdonj/card1.jpg" and a
picture of the second is at "http://www.intellistar.net/~rigdonj/card2.jpg".
The first one is interesting because it has a list on the right side that
appears to be a list of memory locations and op codes. It's hard to see in
the photo but the first column is labeled CNT. (count?). Most of the ICs
are dated 1972. The only other markings on the card is "TERADYNE A 794" and
"Made in USA".
The second one is a core memory board that I *think* may be for a Data
General computer. I picked up several of these and they're all made by
Dataram Corporation and appear to date from 1972. Their part number is
3010290. I took the cover off of one. Man, the cores in these are tiny!
Can anyone identify them?
Joe
In einer eMail vom 03.05.99 21:14:20, schreibt Tony:
<< >
> I would like to connect a Plessey disk drive to a PDP11 RK11-D controller.
>
> The drive has a fixed platter and a removable platter, compatible to RK05
I
> believe, and these numbers on it:
> Plessey 3468-0231
> PMDD/11B
> 700540-200217D
I saw (and did minor repair on) one of these about 8 years ago. It wasn't
mine, and I never saw a service manual :-(
>
> It has a 42 pin MRA 42 S mating connector, and same with a terminator. I
> believe the 42 pin should be a Drive Bus, to be connected with standard
> Unibus cable to controller slot 2A/2B.
I seem to remember that the connector is similar (maybe identical) to the
Diablo Model 30 connector, which I do have the pinout of. I can post that
if it would help.
One thing I certainly remember is that it used 1-of-n selects (like an
RK02/Diablo model 30) and that it could only be linked directly to an
RK11-C controller. There was a Plessey paddleboard that went into the
drive connector slot on an RK11-D and had a decoder chip (at least, maybe
some other simple logic) on it to sort this out.
-tony
>>
I would certainly appreciate the Diablo pinout - if the pin layout is the
same, I would expect the signals to be the same , at least something easier
to check stan starting from nothing !
Thanks
John
If I were in your position, I'd try to get mechanically good cassettes
rather than worrying about acoustically good tape. What's most likely to
happen is that, over time cassette tape will lose chunks of emulsion from
its mylar backing, or the mechanical parts will break or jam causing damage
to the tape. The audio demands for computer use are not very stringent.
Dick
-----Original Message-----
From: Gene Ehrich <gene(a)ehrich.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Monday, May 03, 1999 6:03 PM
Subject: Re: Inquiry
>At 11:58 PM 4/29/99 -0500, you wrote:
>>
>> I have a lot of the kid's computers, (Atari, Commodore, CoCo, etc), which
>> I am trying to keep alive. Does anyone know if I can substitute high
>> quality music tapes in place of computer tapes? Or where I can still
>> find computer cassette tapes for sale?
>>
>> Stephanie
>
>
>
>I would reply to Stephanie but she did not give her e-mail address.
>
>I have some for sale on my web site.
>
>
>
>
>
> gene@ehrich
> http://www.voicenet.com/~generic
>Computer & Video Game Garage Sale
>
>Gene Ehrich
>PO Box 209
>Marlton NJ
>08053-0209
We have 7900's (about 20) in use on test systems still. We also have 7905's and 7906's. I maintain them. The platter package that goes in the 7900 is not the same as for the 7905/6 models. The outside casing looks the same, but the platter for the 7905/6 is about twice as thick as the one for the 7900 drive. Plus, the disk pack for the 7900 Drive has 24 hard sectors as indicated on the bottom of the platter. The 7905/6 disc pack has one notch on the center hub which is used for a soft sector configuration. Do not put the 7900 disc pack in the 7905/6 or vice versa.
Michael Morar
PS - I need some info on the A2 board of the HP-7900A disc drive. The A2 board has special solder terminals mounted on the board for connectors J1 and J4 thru J7. I need to find out who makes them. HP no longer has any info on the drive, and our service manual does not have a break down of these pins.
In a message dated 99-05-04 10:59:32 EDT, you write:
> I always thought that the black apples were the correct color. What
> exactly is the significance of the black case???
it's just a Bell+Howell version of the apple with some minor changes to it.
functionally identical.
You wrote...
>My old computer class was taught on two model 33's (to a HP2000) and a
>black Apple II.
And just where is that HP2000 today????? <grin>
Jay West
I finally borrowed a digital camera to photograph the damage to my PDP-8/L
parity core stack. The damage is more extensive than I remember. There
are the two main areas, but in addition, there are single bits that are
missing here and there over the entire area. I do not think it is possible
to repair this board without rewiring at least the four core mats on this
PCB in toto... that's 128x128 cores for the folks keeping score at home. The
wire density is approx 32 per inch. Much work. I won't be doing this anytime
soon.
Here's some photos of that stack I got back in '82 with a partial PDP-8/L
http://www.infinet.com/~erd/retrcomputing/pdp8/pix/coreassy.jpg - external view
http://www.infinet.com/~erd/retrcomputing/pdp8/pix/coremat1.jpg - one bad mat
http://www.infinet.com/~erd/retrcomputing/pdp8/pix/coremat2.jpg - another one
Thanks for all the responses to my original questions. I'm somewhat gratified
to see that the can of worms that this thread opened has been strangely on
topic. I'm especially interested in hearing the results of the #2 nut core,
if it's suitable for display purposes.
-ethan
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