9 Apr
2002
9 Apr
'02
9:27 p.m.
I'm quite tickled. Also inordinately proud of myself (for figuring
out the BA23's slightly different connections & stuff and not letting
loose any Magic Smoke).
First thing:
Thanks, Terry! I really like it.
Terry's rackmount MicroVAX II has been condensed into a single
BA23. For the nonce, I'm running a single RD54 and a TK50 on their
respective controllers, and a DELQA ethernet board. The KA655-A with
32M is a LOT faster than the KA630 with 13M. The TK50 is slow as
ever....
I was hoping the BA23 would be quieter than the BA123. It's not.
Questions:
Does the KA655 CPU make this a MV-3800, a MV-III, or a MV-II with a
KA655?
Terry, looks like you were right:
The memory board, which is a DataRAM 63016 C0. Listed online as a 16M
board some places and 32M others. The system sees it as 2 16M boards.
Is this kosher?
The 3-position CPU-RAM ribbon cable is plugged at one end and at the
middle connector. Does it matter?
I'd _really_ like to run the RX50 instead of the TK50. Unfortunately,
I don't have a cable. Can a PC floppy cable be modified to work? It
looks like, from reading past posts, connecting on the "B" connector -
i.e. no twist - ought to do the trick. Not quite brave enough to just
plug it in and see.
Last (not really applicable in the BA23), I see references to
terminating the last RD5x on an RQDX3. Is that termination effected at
the distribution board (M9058 in the BA123) or on the drive? Drive 1
and Drive 2 don't look any different. Which may be why they're, um,
terminally off-line.
Doc
P.S. - I've always wanted to say "For the nonce"....
10 Apr
10 Apr
10:46 a.m.
I was hoping the BA23 would be quieter than the
BA123. It's not.
?!?!? What's up with your BA123? My PDP-11/73 is one of the quietest
machines around here, probably the only thing quieter is the latest two
PC's and the G4/450 PowerMac. Have you got all the skins on it? Mine used
to be fairly noisy, but the combination of getting all the skins, and
switching to small 3.5" SCSI HD's has it so quiet it ran all night Sunday
because I forgot it was on! (I've been running it enough lately I'm not
looking forwards to my next electric bill!)
The memory board, which is a DataRAM 63016 C0.
Listed online as a 16M
board some places and 32M others. The system sees it as 2 16M boards.
Is this kosher?
I suspect this is a trick on DataRAM's part to fit 32MB on one board. It's
possible that the CPU will only recognize memory boards up to 16MB.
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast |
| | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| PDP-10 Emulation and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
3:43 p.m.
On Wed, 10 Apr 2002, Zane H. Healy wrote:
Err, no skins. The BA23 came out of a rack, so the front bezel is all
there is. I _do_ have a set of skins, but the PDP-11/53 is wearing
them, and I'm not inclined to evict it. :) Probably if I turned the VAX
so the fans face the wall instead of me, it would help, too.
When somebody donates a SCSI adapter to my collection, I'll be
divesting all the MFM drives myself. I'm not holding my breath.
Pretty much my guess, too. The disk has half of NetBSD on it (the
/usr/ tree is on a disk I don't have), but it boots far enough that I'm
reasonably certain it's actually got all the RAM the system reports.
Thanks,
Doc
I was hoping
the BA23 would be quieter than the BA123. It's not.
?!?!? What's up with your BA123? My PDP-11/73 is one of the quietest
machines around here, probably the only thing quieter is the latest two
PC's and the G4/450 PowerMac. Have you got all the skins on it? Mine used
to be fairly noisy, but the combination of getting all the skins, and
switching to small 3.5" SCSI HD's has it so quiet it ran all night Sunday
because I forgot it was on! (I've been running it enough lately I'm not
looking forwards to my next electric bill!) The memory
board, which is a DataRAM 63016 C0. Listed online as a 16M
board some places and 32M others. The system sees it as 2 16M boards.
Is this kosher?
I suspect this is a trick on DataRAM's part to fit 32MB on one board. It's
possible that the CPU will only recognize memory boards up to 16MB. 
1:24 p.m.
On 2002.04.10 08:27 Doc Shipley wrote:
Does the KA655 CPU make this a MV-3800, a MV-III, or
a MV-II with a
KA655?
Kind of a MV III. The MV 3800 comes in a BA213. The MV III is normaly
KA650 based. So this may be a "MV III+"
The memory board, which is a DataRAM 63016 C0.
Listed online as a
16M board some places and 32M others. The system sees it as 2 16M
boards.
Is this kosher?
Yes. DEC did the same trick...
The KA650 can only manage 16 MB per
memory board. To save slots, when higher density RAMs where available,
There where 32MB boards that emulate two 16 MB boards to make the CPU
feel well.
The 3-position CPU-RAM ribbon cable is plugged at
one end and at the
middle connector. Does it matter?
No.
I'd _really_ like to run the RX50 instead of the
TK50.
Unfortunately, I don't have a cable.
Can a PC floppy cable be modified to work?
Yes. You need a simple 1:1 cable
without twist.
I see references to terminating the last RD5x on an
RQDX3.
Uhh. I never did any termination on a RDxx.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
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