10 Aug
2008
10 Aug
'08
3:10 p.m.
Message: 3
Date: Thu, 07 Aug 2008 17:28:19 -0500
From: Jim Leonard <trixter at oldskool.org>
Subject: Re: Where to find memory ICs?
To: General at mail.mobygames.com,
"Discussion at mail.mobygames.com":On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Message-ID: <489B7703.7050009 at oldskool.org>
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Glen Slick wrote:
I want to use these to populate an Above Board from 2MB to 8MB, and that
would require 6*9*1.89 = $102.06 for just 6MB of RAM.
Does anyone know of a cheaper way to get DRAM? $100 just so I can add
6MB of RAM to a card doesn't seem right...
I came to this discussion late, so apologies if I missed the point.
However, in answer to your last question, I have found desoldering
memory chips from old SIMMs to be a workable method.
I wanted a bunch of 16M X 4 FPM DRAM and the cheapest way to get it
was off of 128 MB 72 pin SIMMs which were selling for about $10 each
when carefully shopped for on Ebay. Each SIMM holds 16 chips so the
price was well under $1 per chip. Plus there were a handful on 16M
X 1 chips on boards as well for parity.
Anyway, your target memory chips might be cheaply available on old 30
pin or 72 pin SIMMs. The biggest obstacle would be a requirement for
DIPs. Most SIMMs have SOJ chips on board, rather than DIPs.
Jeff Walther
I just want a
few tubes of these to populate the board, I'm not looking
for a box of 'em :-) Any pointers?
www.unicornelectronics.com
511000-100 $1.89 quanity 25-99 
11 Aug
11 Aug
10:44 p.m.
Jeff Walther wrote:
I came to this discussion late, so apologies if I
missed the point.
However, in answer to your last question, I have found desoldering
memory chips from old SIMMs to be a workable method.
I thought of that but wasn't sure if they were compatible or not. I'm
not a hardware guru, just a guy who likes to restore old IBM
5150/5160/clones to working service.
I wanted a bunch of 16M X 4 FPM DRAM and the cheapest
way to get it was
off of 128 MB 72 pin SIMMs which were selling for about $10 each when
carefully shopped for on Ebay. Each SIMM holds 16 chips so the price
was well under $1 per chip. Plus there were a handful on 16M X 1
chips on boards as well for parity.
Oh, I have plenty of SIMMs -- if they're compatible, I'll start learning
how to desolder :-)
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
12 Aug
12 Aug
12:55 p.m.
Surely, the cheapest source of old memory ICs is removing them from old
memory boards. A J-RAM/J-Laser or Intel AboveBoard can yield a lot of
chips.
--
Grumpy Ol' Fred cisin at xenosoft.com
14 Aug
14 Aug
6:41 p.m.
Fred Cisin wrote:
Surely, the cheapest source of old memory ICs is
removing them from old
memory boards. A J-RAM/J-Laser or Intel AboveBoard can yield a lot of
chips.
It is an AboveBoard I am trying to *populate* with said chips...
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
6:49 p.m.
Jim Leonard wrote:
Fred Cisin wrote:
Maybe Fred has a
few (full?) AboveBoards kicking around ... save you a
lot of work.
Surely, the cheapest source of old memory ICs is
removing them from old
memory boards. A J-RAM/J-Laser or Intel AboveBoard can yield a lot of
chips.
It is an AboveBoard I am trying to *populate* with said chips...
7:06 p.m.
>> Surely, the cheapest source of old memory ICs
is removing them from old
>> memory boards. A J-RAM/J-Laser or Intel AboveBoard can yield a lot of
>> chips.
Jim Leonard wrote:
> It is an AboveBoard I am trying to *populate*
with said chips...
Sorry about that. When I needed to build some bookcases, a friend told me
that the cheapest source of planks was to buy old bookcases and break them
apart.
On Thu, 14 Aug 2008, bfranchuk at jetnet.ab.ca wrote:
Maybe Fred has a few (full?) AboveBoards kicking
around ... save you a
lot of work.
Sorry, I don't think that I have any AboveBoards around. But, in the
bottom of storage, I have a tote full of J-RAM/J-laser stuff. If I can
make it to VCF this year, I should load up my van.
--
Grumpy Ol' Fred cisin at xenosoft.com
7:07 p.m.
On Aug 14, 2008, at 10:06 PM, Fred Cisin wrote:
soda -> keyboard
-Dave
--
Dave McGuire
Port Charlotte, FL
>>
Surely, the cheapest source of old memory ICs is removing them
>> from old
>> memory boards. A J-RAM/J-Laser or Intel AboveBoard can yield a
>> lot of
>> chips.
Jim Leonard wrote:
> It is an AboveBoard I am trying to *populate*
with said chips...
Sorry about that. When I needed to build some bookcases, a friend
told me
that the cheapest source of planks was to buy old bookcases and
break them
apart.
7:40 p.m.
Fred Cisin wrote:
Sorry, I don't think that I have any AboveBoards
around. But, in the
bottom of storage, I have a tote full of J-RAM/J-laser stuff. If I can
make it to VCF this year, I should load up my van.
I appreciate the offer, but don't do it for my benefit; budgets are low
this year and I won't be making VCF until VCF Midwest 2009.
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
7:48 p.m.
Surely, the cheapest source of old memory ICs is
removing them from old
memory boards. A J-RAM/J-Laser or Intel AboveBoard can yield a lot of
chips.
It is an AboveBoard I am trying to *populate* with said chips...
8:03 p.m.
Cameron Kaiser wrote:
Sorry about that. When I needed to build some bookcases, a friend told me
that the cheapest source of planks was to buy old bookcases and break them
apart.
It took me almost a good half a minute to process that. I think I need a
CPU upgrade.
What book cases *Do you buy*? All the ones I have seen are that cheep
MFB stuff.
Surely, the
cheapest source of old memory ICs is removing them from old
memory boards. A J-RAM/J-Laser or Intel AboveBoard can yield a lot of
chips.
It is an AboveBoard I am trying to *populate* with said chips...
15 Aug
15 Aug
3:03 a.m.
Fred Cisin wrote:
Sorry, I don't think that I have any AboveBoards
around. But, in the
bottom of storage, I have a tote full of J-RAM/J-laser stuff.
The J-Laser was another thing we used when developing that
business graphics/presentation package. Really impressive
at the time, just for the size of the memory. And the direct
video interface to the laser printer was soooo fast...
--
John Honniball
coredump at gifford.co.uk
1:40 p.m.
The J-Laser was another thing we used when developing
that
business graphics/presentation package. Really impressive
at the time, just for the size of the memory. And the direct
video interface to the laser printer was soooo fast...
This interface was, of course, avaiable as an option for the PERQ (all
models). The normal PERQ OIO (Optional I/O) card could be populated with
either or both of an ethernet interface and a Canon CX-VDO laser printer
'video' interface. On the PERR, of course, the graphics 'raster op
machine' was used to generate the laser printer bitmaps, the interface
consisted of a FIFO buffer and a little state machine to control it and
synchronise it with the printer.
I have my home-made CX-VDO printer. It started off as a Canon LBP-8A1,
the formatter board failed and after many long nights of tinkering with
the mechanism, staring at a logic analyser and 'scope, looking at the
PERQ , etc, I got it going as the VDO model (no internal formatter
board). The 'video interface' is just the interface on the 34 pin header
on the engine controller (DC controller board) in a Canon CX printer.
Now that CX toner cartridges are essentailly unobtainable, I've been
wondering if any other printers supporr this interface? I know there was a
version of the SX (Laserjet II etc) which had a PCB of buffers in place of
the intenral formatter board and which had video interface which was
claimed ot be much the same thing. Alas that version seems very hard to
find. Was it supported on anything later?
-tony
5974
days inactive
5979
days old
11 comments
8 participants
participants (8)
-
ard＠p850ug1.demon.co.uk -
bfranchuk＠jetnet.ab.ca -
cisin＠xenosoft.com -
coredump＠gifford.co.uk -
mcguire＠neurotica.com -
spectre＠floodgap.com -
trag＠io.com -
trixter＠oldskool.org