> > The 21064 should work in a PC64 and the 21164 should work in either an
> > EB164 or PC164. I've got extra PC64, EB164, and PC164 motherboards but
> > you're overseas so finding one nearer to you would probably be cheaper.
>
> Do you know where I could find some docs that I could check to see if my
> Alpha chips will work with these boards? I downloaded Digital/Compaq docs,
> but can't find any informoation that confirms that these chips will work
> with the boards you mention.
The motherboard manuals were on the Digital website. They have probably
moved around since I looked at them last. I'll see if I have the PDF
files stuck somewhere.
--
Eric Dittman
dittman(a)dittman.net
Check out the DEC Enthusiasts Club at http://www.dittman.net/
!From: John Ruschmeyer [mailto:jruschme@Mac.com]
!
!> From: David Woyciesjes <DAW(a)yalepress3.unipress.yale.edu>
!> Date: Mon, 8 Oct 2001 16:49:55 -0400
!>
!> I have a Unisys 486 computer. It's a SX-25, with a DX-50 in it also.
!> It's mfg date is 10/92, and style number is SG-3102-425.
!>t's "plateau" is
!> labelled Evaluation Unit A. That would explain the XXXX in the FCC ID
!> field...
!> On the motherboard itself, it has a sticker with...
!> 43611896-000
!> PW300 486SX/25
!> 9240 AVEX
!
!Sounds like a 486SX/25 system upgraded to a DX2/50 with an
!OverDrive chip.
Close. But they are both regular 486 processors. 486SX/25 & 486DX2/50
!> ...while near the 30-pin memory, printed on the board is...
!> UNISYS
!> PW2 300/486
!> PWBA 43188028-000
!>
!> Does anyone know where I can find out what the jumpers do on
!> this board? Or other specs for it? I though I heard someone
!> mention dual processor WRT this board, but I doubt it. There
!> is also a smaller LIF socket next to the 2 LIF
!> processor sockets. IIRC, that is for a 487 math co-processor...
!
!I doubt that its for a 487... I almost wonder if this was some kind of
!386/486 board.
Well, it's a 15x15 pin socket, similar to the 17x17 socket for the 486
processors... If only I had the docs... I'd like to find out how fast I can
push this board...
--- David A Woyciesjes
--- C & IS Support Specialist
--- Yale University Press
--- mailto:david.woyciesjes@yale.edu
--- (203) 432-0953
--- ICQ # - 905818
On October 4, Ethan Dicks wrote:
> I thought that it specifically _was_ the -1. I _think_ I have a DEC-
> badged RD-32 (ST-252-1) from a Pro380 VAX 8530 console, but I might
> be mistaken. Maybe they got what they could get in later years.
Probably so.
> > The ST251 had an average access time of 40ms (if memory serves) and
> > the ST251-1 was 28.5ms.
>
> That sounds right. Stepper motor vs. voice coil. (The ST-225 was
> something horrible like 65ms or more; I used to think seek-time didn't
> matter much on a micro, but when I went from 65ms to 28 on my Amiga,
> _wow_!)
The ST251-1 is a stepper drive also, believe it or not. They actually
built a stepper positioner that achieved 28.5ms. Back when it was new
I heard something about them having patented it or something.
The ST225 was indeed 65ms...scary slow. It made a great distinctive
"peep-peep" sound, though...which I liked even more than the [still
rather cool] "chirp-chirp" sound of the ST251 and ST251-1. :-)
I believe the first voice-coil drvie in that family was the ST-4096,
but I'm not positive of that. That was one nice drive.
-Dave
--
Dave McGuire
Laurel, MD
Another 'whats-it' question here. I have two kinds of, what look like 72-pin
memory...
The first is only 64 pin, has 8 chips (AAA1M300J-08 NMBS 9122),
with an empty spot for a 9th chip. Printed on the back - "1X964P A (in a
circle) 9115". Apparently made by Microtech. My guess is it's 1MB non-parity
memory, but I don't know what uses 64 pin memory sticks. I have 4 of these
sticks.
The second is 68 pin, 2 chip memory. Printed on the back, they're
made in 1994, in the USA, by Cubig Inc. Model number (I think) of VM512K.
512KB memory sticks? Have 3 of them...
Anyone have an idea what these are, and what they're for?
--- David A Woyciesjes
--- C & IS Support Specialist
--- Yale University Press
--- mailto:david.woyciesjes@yale.edu
--- (203) 432-0953
--- ICQ # - 905818
Well sice this is not a PC centric group we may not be the best place
for advice.
However... JTS was a short lived supplier is low cost IDE drives and
were noted for high failure rates though there were the occasional
decent one in the pack. They were also very slow compared to
the better WD, Seagate, Quantum and Maxtor.
Oh, JTS disappeared withing two years after they show up.
Allison
-----Original Message-----
From: Pete Turnbull <pete(a)dunnington.u-net.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Sunday, October 07, 2001 6:43 PM
Subject: Re: Hard Drives
>On Oct 7, 16:50, ajp166 wrote:
>> Beats me what that drive is. This is a group for hardware over 10
years
>> old.
>> If it is that old you likely going to be fixing it yourself.
>
>> -----Original Message-----
>> From: CByrd87043(a)aol.com <CByrd87043(a)aol.com>
>> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
>> Date: Sunday, October 07, 2001 3:48 PM
>> Subject: Hard Drives
>>
>>
>> >I have a Hard Drive model P1200-2af. I need to know where can I send
it
>> to
>> >get it fix or replace. It just stop working.
>
>It's a nothing-special 1.2GB IDE drive with a bad reputation, made by
JTS.
> JTS are no more, so the only likely option is to replace it with a
>Seagate, WD, or whatever.
>
>JTS were famous for, amongst other things, buying part of Atari from the
>Tramiel family, laying off a lot of staff, and then selling it to Hasbro
>shortly after being de-listed by the stock exchange and shortly before
>going bust in 1998.
>
>--
>Pete Peter Turnbull
> Network Manager
> University of York
Joe wrote:
> One of mine has a MODEM but I've never tried to use it. Does anyone
> still support 1200 baud?
The ZX-TEAM Mailbox supports 300-14400 baud ;>)
Glen
0/0
> I was not a RS user at the time and it's quite possible that the rumors I heard
> regarding the M1 and those about the M3 were geting mixed together. I wasn't
> even aware that there wasn't a two-sided option on the stock model 3.
The third-party controllers were most popular on the Model 1, since the stock
FDC was SD. There were a few third-party controllers for the Model III and
the early Model 4, but they weren't as popular as the 1793 was more capable.
The stock Model 1 FDC also had reliability problems that lead to third-party
data separator plug-in circuits.
The only Model 1/III/4 that came stock with DS drives was the 4D. Any other
DS setup was third-party. The stock III/4 controllers (both the add-on in
the III and early 4 and the built-in on the gate-array 4) had no problems
with DS drives.
--
Eric Dittman
dittman(a)dittman.net
Check out the DEC Enthusiasts Club at http://www.dittman.net/
ard(a)p850ug1.demon.co.uk wrote:
> Yes, stupid isn't it. I've some across programs where the
> help files for
> installation are compressed on the CD-ROM, and thus can only be read
> after installation. I wonder which genius came up with that idea.
This is not terribly clever :-)
> Ditto for putting hardware docs in machine-readable form
> only. The time you _need_ those documents (as opposed
> to just wanting a bit of light
> reading) is when the machine won't boot....
Apart from the word "only" above, I humbly disagree.
I have less than perhaps 300 paper manuals and
printsets in all (and a fair proportion of those
are non-technical Owner's Manuals and the like).
Electronic manuals are a godsend for those of us
who are severely restricted space-wise. Add to
that all the scans of manuals and printsets
that I can now find on the net, and I think
that electronic manuals are terrific.
I don't expect to read my manual on the Rainbow that I
am repairing ... that's what the PC or laptop
is for!
> And a lot of modern manuals, even when you've figured out how to read
> them do not contain the information that I would need. Not
> even what I
> would consider to be 'basic' information, like pinouts and
> data formats.
True but probably understandable these days. Things
change so rapidly that there is no time to generate
the manual. The schematics will exist somewhere (although
getting hold of them will be difficult for an outsider
for the usual reasons of commercial sensitivity) but
documentation is usually sketchy at best. Things
may be a little different in the consumer arena,
but the most I've been able to find have been
the TV manuals in the RTSG (or whatever it's called ...
my current TV came with a five year guarantee and the
previous one was a Decca series 80 chassis that was already
old when I got it ... must be 10 years since I've needed
to pop into a library to consult that book!).
Antonio
ard(a)p850ug1.demon.co.uk wrote:
> If I was being totally honest, I would probably admit that there are
> times where board-swapping makes sense. Not _all the time_, though...
> There are certainly times when component level repair make financial
> sense (even when you consider the time taken to replace the
> component),
> and is also the fastest way to get the machine working again.
I cannot think of too many cases (at least in our
current machine room - or indeed anywhere else
I have been) where a repair is better for either the
customer or the repairer. If I look at the routers and
switches in our racks, the PSUs swap out, the fan tray
swaps out and all of the cards swap out. The backplane
and switching fabrics are a little harder - but not much.
Replacing a card is the work of moments and will be much
cheaper for the customer (in terms of down time) and
the supplier (in terms of the amount of training
needed by the FE).
Even five to ten years ago (the times of the VAX 4000
and VAX 6000) I expect that the same economics would
have applied. In fact, I believe that the machines
were designed to keep MTTR low (and MTBF high !).
You would have to go back to the early eighties,
the days of the VAX-11/7xx and the VAX 86xx, to
find FEs fixing components on site. In those days
machines cost a great deal more and people (even
highly trained people) cost a great deal less.
Now once the card has been pulled and returned to
base, then it is probably worthwhile having a repair
line where someone with the appropriate skills
can find the fault and fix it. Obviously if it costs
more to do this than it does to simply use brand new
boards as swap-ins, then even this repair won't be
done.
This is not to say that I won't fix the washing machine
or the TV myself once they go out of waranty (but
even there it was cheaper to get a new drain pump
than try to repair the broken one!)
> No, what worries me is that people are not being taught about
> component-level design and repair any more (design and repair
> are not the same thing, of course).
I too am concerned about that sort of dumbing down.
At least in those courses where it is appropriate.
OTOH it seems perfectly reasonable to me that *most*
people could care less about how their computer
works - after all most people seem to be that way
about their TV, car, DVD etc. I, for one, do
not particularly enjoy plumbing, for example.
> > replacement modules. People like Tony are few and far between.
>
> Probably because very few employers want people like me....
Economics again. Employers only need one of you
for every N field service engineers. Your kind
of skills cost money ... and if they don't you
aren't doing the rest of us any favours - stop it :-)
Antonio
On 7 Oct 2001 1:36:56 +0100 "Iggy Drougge" <optimus(a)canit.se> said:
> Philip Pemberton skrev:
> >I've got two Western Design Center W65SC02s (14MHz >6502s! Woohoo!) to
play
> >with, plus a Synertek SY6502A (the 2MHz one), two W65SC22s (10MHz WDC
6502s)
> >and two Synertek 6522s (1MHz).
> 14 MHz? You're kidding! That's criminally fast!
I kid you not! Go to www.6502.org, grab the datasheet for the W65SC02 and
look at page 43.
For $4, it's bloody good value. Anyone care to start another bulk-buy? Maybe
Mike Nabarezny (sp?), webmaster of 6502.org and the guy who did the original
6502 Bulk Order would care to do another one?
> > 2) Has anyone got a schematic for a fairly half-decent 16-colour (or
> >better) video card that can be modified to work on a 6502? I've had a
look
> >at the NASCOM schematics but I've heard Bad Things(tm) about the NASCOM
> >video system. Aparrently Gemini and a few others produced colour video
cards
> >for the NASCOM. Anyone got schematics for these? Graphics would also be
nice
> >(the NASCOM video system is text only).
> Tony mentioned teletext chips a few days ago. Don't know if those perhaps
are
> only 8-colour, though. Tony?
I've got an SAA5050. Anyone know how to use it without the SAA5020 timing
generator?
I've also got a Microvitec Cub 653 monitor. TTL input, composite sync. How
can I get Csync from Vsync and Hsync?
> > BTW, I'd like to avoid obsolete components if that's at all possible.
> >I've got a Hitachi HD6845 but if the 40-odd page datasheet is anything to
go
> >by, it's a real dog to use... And it only works in monochrome. I have got
a
> >MOS Tech 6568(?) VIC-II, the same one used in the UK Commodore 64. The
PSU
> >for this C64 is fried, took out some of the support components with it.
> The VIC is quite well-documented, and it would certainly be interesting to
see
> it in a non-C64, 14 MHz 6502 system. =)
I doubt a VIC will run at 14MHz.
Later.
--
Phil.
philpem(a)bigfoot.com
http://www.philpem.f9.co.uk/
