the little guys are only 256K by 1, so it takes 9 of them to make a 256K byte bank. PC memory has always been spoken off by the byte.
As for the Amiga, it will take 8 (or 9) to make each 256K byte upgrade. Of course, getting nit picky, 256K bytes could be thought of as a 2meg bit upgrade - it sounds impressive and it what a saleman would have said... LOL
I can understand your need to stick your face in mud rather than buy a PC... :)
best regards, Steve
-----Original Message-----
From: Doc Shipley <doc(a)mdrconsult.com>
Sent: Jun 9, 2004 3:09 PM
To: Steve Thatcher <melamy(a)earthlink.net>, General(a)mdrconsult.com,
Discussion@mdrconsult.com@null,
On-Topic and Off-Topic Posts <cctalk(a)classiccmp.org>, null@null
Subject: Re: Cheetah Cub board
Steve Thatcher wrote:
> hmmm, I thought there were four rows of 18 chips. That sounds like 8 banks of 256K which seems
> like 2meg to me... unless I got something wrong
No, I guess I got it wrong. I thought you meant 256K per chip, or
4MB per bank (16 * 256K plus 2 * 256K for parity).
So are these 256K per bank, or 256K per chip? IOW, if they turn out
to be compatible and I install 16 of them on the Amiga A2091, will that
be a 2MB or 0.25MB upgrade?
I'm a complete retard at memory components. It doesn't make sense to
me at all, even after a fair amount of reading and some explanation from
some Smart People.
> as for board worth, the 256K chips are worth a bit. I found a site that had them for sale at $0.75 each.
Well, that wouldn't suck. Of course that means they're really worth
about $0.20/each. :)
> If you need a PC to run it in, buy one on eBay... LOL (couldn't help that one)
Heh. I'd rather stick my face in the mud.... [family joke]
Doc
dear friend:
i cant somehow reach that board directly anymore
could you pls broadcast the following message under
decstation cache in boston
i have a dozen or so mostly decstations and vax vlc4000 and vaxstations to give away. the decstations are mostly loaded with ram (96mb?) and many boxen have ultrix loaded. in addition i have cables, tapdrives, cdroms and yes megamonitors, terminals, scsi hubs (?) and connectors galore.
trouble is: all is in one heap, i forgot which goes to what! incl passwords! other trouble: all has to go in one fell swoop, no cherry picking. other trouble: it wont fit in a gmc suburban, u need a van. other trouble: i wont lift the junk. other trouble: its in downtown boston, you can park in front of the house, and no, the hydrant has been moved.
last trouble: its free.
contact me at 617 723 5768 after 6pm, so we can make funeral arrangements....
fred
I started to worry about lead paint problem when
buying an old house. I bought a lead test kit and
tested the paint chips from the windows and fould them
to be positive. Then I tested some computer boards,
and the result was postive too. Have you ever found
white powders near solder on your vintage board? They
are most likely lead dioxide. When you power up your
vintage computers, some lead dust will be blown to the
air and inhaled by your kids... Well, the last
sentence is my pure imagination. Has anybody done any
research on this issue? To be safe, I am going to
throw most of my boards to attic, which are lying on
the floor and accessible to my two year old daughter.
vax, 3900
__________________________________
Do you Yahoo!?
Friends. Fun. Try the all-new Yahoo! Messenger.
http://messenger.yahoo.com/
okay, 16 - 256kx1 chips will not give you 2meg... it is only 0.5meg. If the docs you have say 256kx4 then that is the chip you need and the ones on the ISA board are not the right ones.
the 256Kx4 DYNAMIC ram chips that you would need were usually used in VGA cards for display memory.
best regards, Steve Thatcher
-----Original Message-----
From: Bill Sudbrink <wh.sudbrink(a)verizon.net>
Sent: Jun 9, 2004 8:22 PM
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk(a)classiccmp.org>
Subject: RE: Cheetah Cub board
> Back to the DRAM nomenclature, the 1 bit vs 1 byte
> explanation helps a lot. I'm still confused about
> the multiplier.
>
> The Amiga docs show 16 256Kx4 DRAMs for a total of
> 2MB, so does that mean that these chips are 256Kx1?
Exactly!
>1. Are all LaserWriters 100% pure PostScript printers, speaking nothing
>but PS? I know the very original one was, but I'm not sure about whatever
>happened later and whatever they make now.
No, some models spoke postscript, some spoke quickdraw. Many spoke
postscript and other languages (like Diablo, ESC-P, PCL). In fact the
original Laserwriter speaks both Postscript and Diablo 630.
Apple has a listing of the printers they made, and what languages they
spoke. <http://www.info.apple.com/support/applespec.legacy/laser.html>
>2. Were there any LaserWriters made with duplex printing capability? If
>so, what's the earliest duplex LaserWriter?
Yes, and I'm not sure what the earliest one was (I'm also not sure which
models supported duplex. Probably the Pro series and the 12/600, 16/600,
8500 series... I know at least the 12/640 rates a duplex page speed, but
I believe others besides it also had a duplex option)
>3. The original LaserWriter had a serial port. But given the assault on
>serial ports coming from all directions, I don't expect the current ones
>to have one, or do they? When was the last LaserWriter made with a serial
>port? Was there ever a LaserWriter new enough to support duplex printing
>but old enough to have a serial port?
Actually, most of them up thru the end have serial. The problem is, the
serial port doubles as the localtalk port, and it may or may not have
been configurable for connection to a PC. As far as TRUE serial
(RS-232/422 in the form of a DB25 or DE9), I think the Pro 810 may have
been the last to carry that AND talk postscript. I don't know for sure if
there is a duplex option for it or not. Later printers may very well also
support PC serial via the Localtalk connector (which IIRC is really a
RS422 with additional smarts to handle the localtalk protocol)
>4. Are LaserWriter serial ports standard EIA-232 DB25 or something Apple
>proprietary? If the latter, what kind of adapter would I need to make?
Ones that had true serial were standard 232 and/or 422 ports in a DB25
package (there may also have been DE9 connectors, I don't remember for
sure). So no adaptor should be needed. For those that handled serial via
the mini din 8 connector's localtalk port, you would just need a mini-din
8 to D connector of your choice. Those should be 422 ports... but I can't
say for sure that all of them were usable as regular serial. Some may
have been localtalk only (and others may have done serial but weren't
configurable, so you had to be able to know what it expected to have)
Hope some of that is helpful.
-chris
<http://www.mythtech.net>
Does anyone know for sure that if the 4 batteries on the Lisa motherboard
are dead, if that will prevent it from powering up? This machine was working
about 3 years back when it went into storage. Thanks for any tips.
Hi Guys,
I have a friend who has recently retired an Apple IIe in favor of
running a simulator. He was able to use ADT and a serial card to
transfer most of his disk images over to the PC for use with the
simulation, however certain copy-protected games could not be
transferred.
Does anyone know if there is software available to transfer Apple II
disk images on a raw-binary basis (ie: not necessarily well formed
sectors), and if so, are there any simulators which can make use of
such images?
I know this would be fairly complex, as the Apple could do half
tracks etc., and timing can be critical to many Apple copy protection
schemes. These factors would also have to be delt with somehow - is
there anything available which can do this?
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html
I located a handful of these, they are never-used, brand new. I don't have a use for them any more, maybe you do.
They are $92 a piece new from l-com, I'd be willing to let them go for less :-)
Specs are here:
http://www.l-com.com/jump.jsp?lGen=detail&itemID=2789&itemType=PRODUCT&iMai…
Drop me an email if interested.
Thanks.
I met a guy over Memorial day weekend, that says the best place for lobster
is at "Anthony's Pier 4"...
That said, has there been any headway WRT lodging arrangments & whatnot for
VCF East?
Thanks,
Roger "Merch" Merchberger
--
Roger "Merch" Merchberger | "Profile, don't speculate."
sysadmin, Iceberg Computers | Daniel J. Bernstein
zmerch(a)30below.com |
that is a Micron part number for a 100ns 256K ram. It is probably an EXPANDED memory card unless it has two bus connectors then it might be EXTENDED memory (didn't we just have a conversation about PC memory...)
It is more than likely one of the two memory standards and will work in any OLD PC.
best regards, Steve Thatcher
-----Original Message-----
From: Doc Shipley <doc(a)mdrconsult.com>
Sent: Jun 9, 2004 12:07 PM
To: General(a)mdrconsult.com, Discussion@mdrconsult.com@null,
On-Topic and Off-Topic Posts <cctalk(a)classiccmp.org>, null@null
Subject: Cheetah Cub board
I have a full-length ISA board marked "Cheetah Int'l Cheetah Cub
2Mbyte Fast Memory". Copyright 1986
It has 4 banks of 18 socketed memory chips marked:
USA 8726 B
MT 1259-10
I'm guessing those are 10ns 32KB chips?
I'm really curious what this board will work with and its history.
Google seems not to know it exists.
Doc
