14 Oct
2001
14 Oct
'01
11:15 a.m.
The '582 is carry lookahead generator if memory serves. Used to speed
up addition of long words.
Allison
-----Original Message-----
From: Dave McGuire <mcguire(a)neurotica.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Sunday, October 14, 2001 7:05 PM
Subject: Re: Unknown IC
On October 14, Jim Donoghue wrote:
> Anybody know what a 74F582 is? 24-pin DIP, it's on a processor board
along
with several
74LS181's and various others. Thanks.
Ahh, the 74LS181s are ALUs, as is the 'F582. Interesting that they
used both. I'm curious...what kind of processor is this?
-Dave
--
Dave McGuire
Laurel, MD 
16 Oct
16 Oct
5:18 a.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
Went to a new thrift store this week. Ended up with way more stuff
than I expected to. The big items were a complete Amstrad PC 6400
(8-bit PC clone, dual half-height floppies, 3 ISA slots, proprietary
monitor that powers the base through a monster DIN connector,
proprietary keyboard with 9-pin joystick connector) and a nearly complete
PCjr w/128K and parallel port sidecars (got non-chicklet keyboard w/cable
and CPU, but no PSU). How much should a PCjr PSU run me? What cartridges
were there for it? The company I used to write kids games for (Software
Productions - makers of "Alphabet Beasts and Company, Micro Mother Goose,
Micro Habitats, etc.) did support it, but I was the C-64 dude, not the
PeeCee dude. (ob digression: when the company closed, we _did_ hold the
door open with the PCjr - it really was a doorstop ;-)
The scary part is that the Amstrad was about triple the cost of the Peanut
(~$6 (after markdown from $11) vs ~$2). I guess size does matter.
So far in my digging, I've found that the Amstrad PC 6400 is the
American name for the Amstrad PC 1640, and I found a good Amstrad
resource at http://web.ukonline.co.uk/cliff.lawson/index.htm
Any other good tips?
-ethan
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8:49 a.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
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9:47 a.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
[...]
I did think of that. It's obviously not complicated.
a nearly complete PCjr ...no PSU).
To buy or to build? My PCjr was also missing the power supply when I got
it, so I had to make one. If you also want to build one, I can tell you that
it's about 17V AC, at
about 50VA-100VA (so say about 3A-5A maximum). The outside 2 pins on the
power connector are the AC inputs, the middle one is earth ground (and is
_not_ connected to a centre tap on the transformer winding, no matter
what some ancient posts here said).
Perfect. Just what I would need to know to make one.
You can make a PSU...connector... by cutting down a
disk drive power
socket)
I wasn't sure the pins on the back of the PCjr were the right size for
that (there are a couple diameters of Molex pins), but I could try it.
It wouldn't be as nice as a molded connector, but it would work.
I assume you have the PSU board that fits inside the
PCjr (it has the
power connector and switch on the back edge).
I have that part. The innards are intact. The only thing missing was
a plastic divider between one of the sets of pins on the back (it was
broken off and hanging by a sliver when I picked up the unit). Hardly
catastrophic.
I am now debating upgrading the sidecar from 128K to 512K (it involves
removing 16 x 4164 chips, adding low-profile sockets and 16 x 41256 DRAMs
and moving a jumper). If I ever intend to use this, I'll probably do it.
If I don't, I can spend the time elsewhere. I have plenty of chips. The
part I thought was funny was that it's essentially the same core circuit
as the COMBOARD-II - a 74S409, a fist-full of DRAM and some 33Ohm
resistors on the CAS and RAS lines (it took our engineers a bit of work
to realize they needed the in-line resistors to dampen the lines from
ringing and undershoot) I still have multiple kilograms of 74S409 chips
if anyone wants to attempt a classic DRAM design. It would even work
with 256K 30-pin SIMMs, so you don't need to layout a board with DIPs...
Even our final design for the VAXBI used it, but with 44256 chips instead
of 41256 chips to save space.
-ethan
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10:45 a.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
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1:41 p.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
I have a copy of the PCjr Technical Reference Manual. I bought a PC-Jr for
my brother years ago and got the Reference but never used it. "L@@K RARE
computer book".
On page 2-135
"The system power supply is a 33 watt, three voltage-level, two stage
supply"
Appendix D-1
Transformer
Input: 110 Vac 60Hz
Output: Pin 1 - 17Vac, Pin 2 - GND, Pin 3 -17 Vac
I put scans of the internal Power Supply schematic and PCB here:
http://members.home.net/swtpc6800/PC_JR/
Download them now before AtHome goes out of businness.
-----------------------------------------------
Michael Holley
holley(a)hyperlynx.com
-----------------------------------------------
17 Oct
17 Oct
8:25 a.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
I tried to get these scans but they wouldn't come up on my browser alas.
Lawrence
I have a copy of the PCjr Technical Reference Manual.
I bought a PC-Jr for
my brother years ago and got the Reference but never used it. "L@@K RARE
computer book".
On page 2-135
"The system power supply is a 33 watt, three voltage-level, two stage
supply"
Appendix D-1
Transformer
Input: 110 Vac 60Hz
Output: Pin 1 - 17Vac, Pin 2 - GND, Pin 3 -17 Vac
I put scans of the internal Power Supply schematic and PCB here:
http://members.home.net/swtpc6800/PC_JR/
Download them now before AtHome goes out of businness.
-----------------------------------------------
Michael Holley
holley(a)hyperlynx.com
-----------------------------------------------
Reply to:
lgwalker(a)mts.net
3:06 p.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
These are jpeg files created with Adobe Photoshop 5.0 LE. Did anyone else
have problems?
-----------------------------------------------
Michael Holley
holley(a)hyperlynx.com
-----------------------------------------------
----- Original Message -----
From: "Lawrence Walker" <lgwalker(a)mts.net>
To: "Michael Holley" <swtpc6800(a)home.com>om>;
<classiccmp(a)classiccmp.org>
Sent: Wednesday, October 17, 2001 1:25 PM
Subject: Re: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
I tried to get these scans but they wouldn't come
up on my browser alas.
Lawrence
18 Oct
18 Oct
4:28 a.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
--- Michael Holley <swtpc6800(a)home.com> wrote:
These are jpeg files created with Adobe Photoshop 5.0
LE. Did anyone else
have problems?
I did not have a problem viewing the files.
Thanks for making them available.
-ethan
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17 Oct
17 Oct
4:33 a.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
The 1640 reminds me of the IBM 2011 with the power supply in the monitor
unit. There was an informative thread a while back on the mail list in the
spring of 1999 regarding the 1640. I have one but alas no K-B. I did win one
on e-bay but was never able to get a reply from the seller.
I also have a PCjr and like you don't have the PSU. They come up on e-pay
occasionally but either I haven't had the money at that time or else the seller
wouldn't ship to Canada. I have managed to acquire some manuals for it,
including the IBM one, however, as well as some cartridges but they are
buried somewhere among my stuff which is still in disarray due to my move
this summer. When I run across them I'll let you know.
Lawrence
Went to a new thrift store this week. Ended up with
way more stuff
than I expected to. The big items were a complete Amstrad PC 6400
(8-bit PC clone, dual half-height floppies, 3 ISA slots, proprietary
monitor that powers the base through a monster DIN connector,
proprietary keyboard with 9-pin joystick connector) and a nearly complete
PCjr w/128K and parallel port sidecars (got non-chicklet keyboard w/cable
and CPU, but no PSU). How much should a PCjr PSU run me? What cartridges
were there for it? The company I used to write kids games for (Software
Productions - makers of "Alphabet Beasts and Company, Micro Mother Goose,
Micro Habitats, etc.) did support it, but I was the C-64 dude, not the
PeeCee dude. (ob digression: when the company closed, we _did_ hold the
door open with the PCjr - it really was a doorstop ;-)
The scary part is that the Amstrad was about triple the cost of the Peanut
(~$6 (after markdown from $11) vs ~$2). I guess size does matter.
So far in my digging, I've found that the Amstrad PC 6400 is the
American name for the Amstrad PC 1640, and I found a good Amstrad
resource at http://web.ukonline.co.uk/cliff.lawson/index.htm
Any other good tips?
-ethan
__________________________________________________
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Make a great connection at Yahoo! Personals.
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Reply to:
lgwalker(a)mts.net
4:52 a.m.
New subject: Blame Microsoft! (in bad taste)
Where did the idea come from? One way or another, we always knew that
there would be a way to blame Microsoft.
At Foothill, along with some other stuff, I got a 1988 copy of Microsoft
Flight Simulator. The picture on the box is very stylized view of a
[small] jet flying in front of WTC! The text on the back of the box goes
on to suggest trying to fly your plane between the towers (they missed?)
--
Grumpy Ol' Fred cisin(a)xenosoft.com
5:48 a.m.
New subject: Blame Microsoft! (in bad taste)
Speaking of bad taste,
Did anyone notice that there was a picture of the WTC
expolsions published in 'Wired' before the 11th?
(apologies in advance) Fact. The October issue has
no Written reference to the event because it was obv.
made before 11-Sep. However, on p.170 there is a
very realic picture from an ultrabad taste (now)
CD called Party Music of The Coup. where the artwork
depicts two tower explosions.
So... blame Wired?
John A.
I think the A-bomb folks are getting Me 'wired'
12:10 p.m.
New subject: allain@panix.com
I know this is a long shot, but ... some time back I received a check from
someone, possibly you, possibly someone else, ( I don't keep emails that far
back) for a classic computer item that was returned not too long ago by the P.O
for want of an address, as the address label was scuffed off the box. If you
can tell me what the item was, how much money you sent, and the number of the
account into which your check was deposited, I'll send the package again, at my
own expense. If that's not you, then please forgive me for disturbing you. If
it was you then please send me the address again, and I'll paste it onto a
label, print it, and ship it off forthwith.
regards,
Dick
----- Original Message -----
From: "John Allain" <allain(a)panix.com>
To: <classiccmp(a)classiccmp.org>
Sent: Wednesday, October 17, 2001 11:48 AM
Subject: Re: Blame Microsoft! (in bad taste)
Speaking of bad taste,
Did anyone notice that there was a picture of the WTC
expolsions published in 'Wired' before the 11th?
(apologies in advance) Fact. The October issue has
no Written reference to the event because it was obv.
made before 11-Sep. However, on p.170 there is a
very realic picture from an ultrabad taste (now)
CD called Party Music of The Coup. where the artwork
depicts two tower explosions.
So... blame Wired?
John A.
I think the A-bomb folks are getting Me 'wired'
6:05 a.m.
New subject: Blame Microsoft! (in bad taste)
On Wed, 17 Oct 2001, Fred Cisin (XenoSoft) wrote:
Where did the idea come from? One way or another, we
always knew that
there would be a way to blame Microsoft.
At Foothill, along with some other stuff, I got a 1988 copy of Microsoft
Flight Simulator. The picture on the box is very stylized view of a
[small] jet flying in front of WTC! The text on the back of the box goes
on to suggest trying to fly your plane between the towers (they missed?)
Try to sell it on eBay, and if they attempt to remove your auction, sue
them!
:)
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
8:55 a.m.
New subject: New aquisitions: PCjr (minus power supply) and Amstrad PC 6400
--- Lawrence Walker <lgwalker(a)mts.net> wrote:
The 1640 reminds me of the IBM 2011 with the power
supply in the monitor
unit.
PS/1?
There was an informative thread a while back on the
mail list in
the spring of 1999 regarding the 1640. I have one but alas no K-B.
I was smart enough to recognize that the keyboard was special when I saw
it on the shelf 20 feet from the CPU. The big tip-off that it was a
strange system was the humongous DIN connector on the end of one of
the monitor cables.
...some cartridges... buried somewhere... When I run
across them I'll
let you know.
Thanks,
-ethan
__________________________________________________
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8467
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14 comments
9 participants
participants (9)
-
ajp166＠bellatlantic.net -
allain＠panix.com -
ard＠p850ug1.demon.co.uk -
cisin＠xenosoft.com -
edick＠idcomm.com -
erd_6502＠yahoo.com -
foo＠siconic.com -
lgwalker＠mts.net -
swtpc6800＠home.com