First, I would like to register my *profound* gratitude to all the
folks who 'rescued' this list.. thank you for your dedication and
time. My Old Computer hobby would be much the poorer were it not for
classiccmp. Thanks again! :)
Second: I have an 11/15 and two expansion boxes. The 11/15 itself
is front-panel, backplane, and power supply only... it never had
cards. One of the expansion units is *full* of old "G" series and a
few "M" series flip-chip style small cards. The second expansion box
is empty. The CPU front panel is cosmetically good, nothing is
damaged.. it could use some soap and elbow grease, though. I have
never had power on to them... electrically unknown therefore.
These items are outside of my area of interest, and I need to free
up some rack space. They are available without charge to the
individual who is fool^H^H^H^H adventureous enough to come and get
them.. all-up weight is about three hundred pounds and I'm not even
going to *consider* shipping them... not that the excersise wouldn't
be beneficial... ;}.
I am in Los Angeles, CA.
Will also trade for Kennedy 9300 or DEC TU16 magtape and formatter
cards.... if in reasonable distance of LA, I can provide transport
for this scenario.
Cheers
John
I thought the PC/XT-286 was basically an AT motherboard in an XT case. At
least that's what I remember from a previous discussion about the XT-286.
--
-Jason Willgruber
(roblwill(a)usaor.net)
ICQ#: 1730318
<http://members.tripod.com/general_1>
-----Original Message-----
From: David C. Jenner <djenner(a)halcyon.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Saturday, November 21, 1998 5:52 PM
Subject: Re: 16-bit 8088/8086?
>Sounds like you are describing almost exactly the IBM PC/XT286.
>
< My idea was either an 8088 or an 8086 with a 16-bit AT-style bus. (keep
< mind that it's a theoretical idea, and not an actual project -- yet)
The 8086 can be used onthe 16bit ISA bus, its a 16 bit cpu with a 16bit
bus and 20 address lines. That will do.
< -Would it be possible to have CPU cache with an 8088 or 8086?
Not needed as the fastest 8086(V30) is 12mhz (there may be faster)
and most moden Dram can keep up with that making cache unnecessary.
Cache is a was to make a fast ram keep up with a really fast cpu.
< - I'd use the 8 MHz 8086 or 8088.
Why not the 12mhz parts. Also the 8086 has a small performance advantage.
< If this would work at all, what performance would come out of it? Would
< perform like an XT, a 286, a TRS-80, or what?
It would be a turboXT. IT's been done, check on the design of the IBM
PS2/25 or 30. PS2/m30 was a 8086/8mhz, used 30 pin simms, it was
ISA8bit (the performance difference was small there).
Two cpus require far more complex software and operating system to have
any value and the improvement will not be 2x, more like 20%, though
multitasking may bo slightly better.
< My final question is another slight disagreement with my friend. He sa
< that it would be possible to piggyback (like IBM did with the early AT R
< chips) a second 8-MHz 8088 onto the existing 8088 in an XT to make it 1
< MHz. I told him that I didn't think it would work.
Your right. It would likely not work at all as both cpus are not
guarenteed to be in sync and if one gets out of sync they will crash
each other.
< What exactly would happen if this was done? Would it run at 8 MHz? Wou
< it run at 16 MHz, or something in-between? Would it speed up, slow down
< melt down, or just fry everything?
Crash.
Allison
Does anyone have a spare copy of the Maxtor XT-2190 manual, or is anyone
willing to make me a photocopy of it? A Maxtor XT-1140 manual would be
almost as good.
Thanks!
Eric
On Sat, 21 Nov 1998 20:40:06 EST SUPRDAVE(a)aol.com writes:
>harrumph; typical clueless non-computer type that thinks any old
>computer is
>worth plenty. there's a guy at an established flea market that tries
>to get
>the same price out of old machines. i bought a northgate 386/20 from a
>guy at
>work and even got the great northgate keyboard too for only $20!
<SNIP>
Hah! That's nothing! I snarfed a couple of 386's from work for *NOTHING*.
I asked the sysadmin if these were left over from the company sale.
"Yep! Nobody wants 'em. Take 'em!"
One was an Everex with a mondo-scarce RLL drive. . .
Jeff
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Could it be possible?
I was talking with a friend of mine, and we somehow got on the topic of what
would be a cool "custom computer" to have.
My idea was either an 8088 or an 8086 with a 16-bit AT-style bus. (keep in
mind that it's a theoretical idea, and not an actual project -- yet)
-It would probably involve using dual processors, (and probably dual math
processors) to make up for the 16-bits.
-It would probably have 1 MB RAM, with 30-pin expansion slots.
-Would it be possible to have CPU cache with an 8088 or 8086?
-I would probably try to use the basic layout from a PC/AT motherboard, and
hand wire everything (so I don't have to fool around with etching
chemicals).
- I'd use the 8 MHz 8086 or 8088.
If this would work at all, what performance would come out of it? Would it
perform like an XT, a 286, a TRS-80, or what?
My final question is another slight disagreement with my friend. He says
that it would be possible to piggyback (like IBM did with the early AT RAM
chips) a second 8-MHz 8088 onto the existing 8088 in an XT to make it 16
MHz. I told him that I didn't think it would work.
What exactly would happen if this was done? Would it run at 8 MHz? Would
it run at 16 MHz, or something in-between? Would it speed up, slow down,
melt down, or just fry everything?
ThAnX,
--
-Jason Willgruber
(roblwill(a)usaor.net)
ICQ#: 1730318
<http://members.tripod.com/general_1>
Does anyone have copies of software or manuals for equipment from
The Digital Group?
I'd be interested in most anything at all for it, but particularly in
PHIMON software, and in manuals and schematics.
Thanks!
Eric
< > >We all make mistakes (or at least I do :-)). It is worth checking thi
< > >Why DEC didn't use polarised connectors here is a mystery to me...
< >
< > This is indeed a bone-headed thing DEC did. I bet a lot of field engin
< > were cussing about that. Must have been two different design departmen
< > between RK's and RL's (Allison. . . comments?)
DEC Field circus created CSSE (Customer Services Support Engineering)
to keep an eye on the design, testing and manufacturing processes
at the product level to engineer out things like that. That was back
in the 70s, by 1991 they put themselves out of business as they had
"trained" engineering and manufacturing well.
< Yes. On every DEC drive I own (and I guess most others), track 0 is at
< the outside edge of the disk and the highest track is closest to the
< spindle. Allison/Tim will now post a list of exceptions :-)
I'm sure there are exceptions but not many. The oddballs I know of are
most fixed head disks and of course drums.
Speaking of drums, has anyone seen any out there?
Allison
If someone can help this fellow with front-panel schematics, as noted in
his message, please contact him directly.
Thanks!
-=-=- <snip> -=-=-
From: mlaman(a)home.com
Newsgroups: alt.sys.pdp11
Subject: Looking for schematics (or pointers to them) for PDP 11/70 and
PDP 11/40 Front Panels
Message-ID: <365681d0.44505453@news>
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Date: Sat, 21 Nov 1998 09:05:44 GMT
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Hi,
I looking for schematics for PDP 11/70 and PDP 11/40 Front Panels.
Pointers to where I might find them are helpful too.
Thanks in advance,
Mike
-=-=-=-=-=-=-=-=-
Bruce Lane, Owner and head honcho,
Blue Feather Technologies -- kyrrin (at) bluefeathertech [dot] com
Web: http://www.bluefeathertech.com
"...No matter how we may wish otherwise, our science can only describe an object,
event, or living thing in our own human terms. It cannot possibly define any of them..."
I agree that he is somewhat clueless, but I don't agree that it's for that
reason. Many people feel bad that they got an expensive computer only
recently, and are forced to sell it for next to nothing. They want some kind
of return on it. I guess it's too bad. One simply has to explain to these
people that it simply doesn't work this way with computers. PCs and XTs are
usually under $20, though I've seen some selling over $50, for the same
reason. Then again, if the computer is very clean and has the original
manuals, it may be worth it to a collector.
>harrumph; typical clueless non-computer type that thinks any old computer
is
>worth plenty. there's a guy at an established flea market that tries to get
>> They had a no-name 386 clone, complete with color monitor, in working
>> condition for $175, and a 486, no monitor, unknown condition (most
likely
>> working though) for $250.
>>
>> Seemed very high to me, as I've picked up working 8080 PC's and XT's for
>> under $20. . .
>>
>> (They did also have an old Mac 128, but I didn't inquire about it, as
>> those are not exactly rare either)
>>
