Hello, all:
I got my hands on a PC-based EPROM programmer S/DRAM tester IC tester. There
is an ISA add-in card and an external box with ZIF sockets. The only thing
that I am missing (doh!) is the software diskette.
The board is manufactured by Yih-Lung (Hong Kong), model# YL-23. It has two
microcontrollers, both are Motorola 6821.
I know that this is a loooong shot, but can anyone point me in any direction
to find a replacement disk. Thanks!
+============================================+
| Rich Cini/WUGNET
| <rcini(a)msn.com>
| MCP Windows 95 and Windows Networking,
| Charter ClubWin! Member (6) and a
| collector of classic computers
+============================================+
In im Kansas, and have plenty of space, but no means by which to transport.
----------
> From: Scott Ware <s-ware(a)nwu.edu>
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: Re: VAX RESCUE NEEDED: Ilinois area
> Date: Wednesday, September 10, 1997 3:00 PM
>
> On Wed, 10 Sep 1997 kyrrin2(a)wizards.net wrote:
>
> > Heads up! Got an 11/780 that needs rescue in Ilinois. Contact the
> > fellow directly for details.
>
> As an apartment dweller, an 11/780 is out of my league; however, I may be
> able to assist in the rescue if anyone else has space available and just
> needs help, especially if there are "extra" SMD drives involved.
>
> I'm in Chicago, as is the contact. The machine is near Milwaukee.
>
> Anyone?
>
> --
> Scott Ware s-ware(a)nwu.edu
Heads up! Got an 11/780 that needs rescue in Ilinois. Contact the
fellow directly for details.
-=-=- <snip> -=-=-
Xref: xyzzy comp.sys.dec:14845
From: eric(a)oxygen.aps.anl.gov (Eric Lindert)
Newsgroups: comp.sys.dec
Subject: VAX 11/780 Free to good home
Date: 9 Sep 1997 21:28:06 GMT
Organization: Argonne National Laboratory, Chicago Illinois
Lines: 14
Distribution: world
Message-ID: <5v4f16$81i(a)milo.mcs.anl.gov>
NNTP-Posting-Host: oxygen48.aps1.anl.gov
Path:
xyzzy!uunet!in2.uu.net!198.174.169.7!winternet.com!news.myna.com!www.nntp.primenet.com!globalcenter1!news.primenet.com!nntp.primenet.com!howland.erols.net!vixen.cso.uiuc.edu!milo.mcs.anl.gov!oxygen!eric
VAX 11/780 free to good home:
Have VAX 11/780 with 3 FUJITSU hard drives, 9 track tape transport,
2 consoles, all documentation, software, cards, racks, etc.
Have moved, and do not have room any longer. System is in Shorewood,
WI (near University of Wisconsin-Milwaukee). Must sacrifice soon.
Please respond directly, not to newsgroup, as I don't have time to
address each.
Eric Lindert
eric(a)aps.anl.gov
home: (630)493-1837
wk : (630)252-9424
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, SSG Computing Support
(253) 773-8576 Bldg. 18-04.2, Col. G1
Boeing ISDS, Kent Space Ctr.
b.lane(a)pss.boeing.com
"...No matter how hard we may try, our science can only describe an
object, event, or living creature, in our own human terms. It cannot,
in any way, define any of them..."
Who is the illinois contact?
----------
> From: kyrrin2(a)wizards.net
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: VAX RESCUE NEEDED: Ilinois area
> Date: Wednesday, September 10, 1997 2:16 PM
>
> Heads up! Got an 11/780 that needs rescue in Ilinois. Contact the
> fellow directly for details.
>
> -=-=- <snip> -=-=-
>
> Xref: xyzzy comp.sys.dec:14845
> From: eric(a)oxygen.aps.anl.gov (Eric Lindert)
> Newsgroups: comp.sys.dec
> Subject: VAX 11/780 Free to good home
> Date: 9 Sep 1997 21:28:06 GMT
> Organization: Argonne National Laboratory, Chicago Illinois
> Lines: 14
> Distribution: world
> Message-ID: <5v4f16$81i(a)milo.mcs.anl.gov>
> NNTP-Posting-Host: oxygen48.aps1.anl.gov
> Path:
>
xyzzy!uunet!in2.uu.net!198.174.169.7!winternet.com!news.myna.com!www.nntp.pr
imenet.com!globalcenter1!news.primenet.com!nntp.primenet.com!howland.erols.n
et!vixen.cso.uiuc.edu!milo.mcs.anl.gov!oxygen!eric
>
> VAX 11/780 free to good home:
>
> Have VAX 11/780 with 3 FUJITSU hard drives, 9 track tape transport,
> 2 consoles, all documentation, software, cards, racks, etc.
> Have moved, and do not have room any longer. System is in Shorewood,
> WI (near University of Wisconsin-Milwaukee). Must sacrifice soon.
> Please respond directly, not to newsgroup, as I don't have time to
> address each.
> Eric Lindert
> eric(a)aps.anl.gov
> home: (630)493-1837
> wk : (630)252-9424
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Bruce Lane, SSG Computing Support
> (253) 773-8576 Bldg. 18-04.2, Col. G1
> Boeing ISDS, Kent Space Ctr.
> b.lane(a)pss.boeing.com
> "...No matter how hard we may try, our science can only describe an
> object, event, or living creature, in our own human terms. It cannot,
> in any way, define any of them..."
Tim:
>>According to the "Edited Option/Module List" that I have, there are >>no
fewer than 21 variations of the M7551, ranging from 1 to 4 >>MBytes of
memory. Generally, the -A suffix indicates 1 Mbytes, >>the -B indicates 2
Mbytes, and the -C indicates 4 Mbytes. The >>next letter in the suffix
indicates the source of the DRAM chips.
At least I'm not crazy (in spite of what people may say!) about the RAM size.
My M7551 carries the "CF" suffix. Is there a way that I could get a copy of
your module list?? The one that I have from the VAX forum on CompuServe seems
to leave out key information. It would be helpful to me for when I go shopping
at Temple U. in October.
Here's the revised configuration (I actually coppied the numbers down this
time).
Slot TOP BOTTOM function
8 open open
7 M7512 open buss extender
6 M8639-YA {same} RQDX1 disk controller
5 M9047 M7504 continuity / Ethernet
4 M3104 {same} serial EIA mux-8
3 M7551-CF {same} memory
2 M7135 {same} processor 1
1 M7136 {same} processor 2
Slot 1 is the first slot on the right facing the bulkhead. The buss extender
is used to connect to an external RD52 hard drive.
Thanks again.
-------------------------------------------------
Rich Cini/WUGNET
<rcini(a)msn.com>
- ClubWin Charter Member (6)
- MCP Windows 95/Netowrking
Forwarded from the COMMPUTERSEUM:
From: mib(a)juno.com (Morton I. Bernstein)
Date: Tue, 09 Sep 1997 02:06:19 EDT
Do you know anyone who wants an early serial number Britton-Lee Data Base
machine. The first of the kind. It can be had for the cost of
transporting it from Los Angels to wherever.
Mort Bernstein
I get a 554 code ?? Thanks loads for the info and I hope this code is not
a bad one.
At 10:36 AM 9/8/97 -0400, you wrote:
>> 1. IBM Powerstation 320 with a 19' monitor 6091-19 with cable (3 BNC),
>> anyone having some info this unit I could use it. Can't get it to show
>> anything on the monitor. All lights are on.
>
>What does the numeric display on the box do? It should spew out lots of
>different numbers (POST (Power On Self Test) and results - a blinking 888
>is really BAD, getting stuck on other numbers can also be bad). I have the
>service manual for the beasts, and it describes all of the codes. Let me
>know what your machine does.
>
>> 2. IBM Powerstation 220 with 17" monitor this unit is locked in service mode
>> and I did not get a key. Any info this one would be great.
>
>Without a key you are in trouble. They are special keys that are basically
>unique to the machine (unlike the famous DEC key). At least in service
>mode, you should be able to get the cover off - if it were in "secure" or
>"normal", the cover would also be locked.
>
>> 6. About 10 very large boxes full of IBM PS/2's and other parts. I have
>> very busy weekend with these boxes.
>
>If there are MCA cards in there, check to see if any are for the RS/6000s
>- they are different, but look fairly similar to the PS/2 variety.
>
>William Donzelli
>william(a)ans.net
>
>
>
A couple people (Richard Cini, William Hayes) were interested in the
terminals and requested more information. Here's some blurbs from the
manuals:
First the CIT-101e Video Terminal by CIE Terminals (a C.Itoh electronics
company):
The CIT-101e is directly interchangeable with the Digital Equipment
Corporation (DEC) VT100 Video Terminal. The CIT-101e can operate in one
of two modes, ANSI or VT52. In ANSI mode the CIT-101e is compatible with
American National Standards Institute (ANSI) programming standards. In
the VT52 mode the CIT-101e is software compatible with DEC VT52 terminals.
Standard features include a full and half duplex communication channel,
RS-232-C or 20 mA current loop communication interface, an auxiliary full
duplex port, an alternate character set, and temporary storage of up to
three display pages.
Next, the AT&T Information Systems DataSpeed 4425 Display Terminal:
Hmmm, well there's no real good descriptive blurb to type up like the CIE
manual had. This terminal can be configured in the setup to do VT52
escape sequences. I don't think it has a current loop interface as I
don't see any mention of one. It does have an "integral modem", which is
actually an external box. It goes up to 1200 baud. You can dial the
modem right from the terminal by hitting the F1 key.
Both these terminals can do 132 columns. I don't know if that excites
anyone but I thought I'd mention it.
I'll tell the guy to hold off on dumping them until you folks have made up
your minds. Again, there's also a ton of switchboxes, cables and gender
changers.
Sam Alternate e-mail: dastar(a)siconic.com
-------------------------------------------------------------------------------
Computer Historian, Programmer, Musician, Philosopher, Athlete, Writer, Jackass
Attend the First Annual Vintage Computer Festival
See http://www.siconic.com/vcf for details!
On Mon, 8 Sep 1997 07:40:47, Tim Shoppa <shoppa(a)alph02.triumf.ca>
wrote:
>>Part of the confusion may have arisen because the Richard (the owner of
>>the Microvax I, if I follow the attributions correctly) didn't
>>post the full M-numbers of all the cards. It's possible that he
>>has a 4 MB memory card that is only half-populated; the alphabetic
>>suffix to the M-number determines how it was populated at the factory.
I thought it odd that the M-number for the memory card is listed in some info
that I have as "1mb MOS memory card", but Ultrixboot reports 4mb of RAM. I
don't recall seeing a letter suffix, but frankly, I wouldn't have known to
look -- this is my first DEC system, so I'm not familiar with their numbering
conventions. I also haven't yet pulled the cards from the backplane in order
to inspect them. My time has been spent rebuilding the power cable and trying
to get the external RD52 to work.
From "memory", here's the backplane configuration:
Slot TOP BOTTOM function
8 open open
7 {M7954?} open buss extender
6 M8639 {same} RQDX1 disk controller
5 M7502 {M7948??} Ethernet / {slot filled}
4 M3104 {same} serial EIA mux-8
3 M7551 {same} memory
2 M7135 {same} processor 1
1 M7136 {same} processor 2
I can't remember what's in the remainder of slot 5, but since the unit has
floppies, the M7948 is a guess. I'll take a better inventory tonight.
More to come...
-------------------------------------------------
Rich Cini/WUGNET
<rcini(a)msn.com>
- ClubWin Charter Member (6)
- MCP Windows 95/Netowrking
this was posted on comp.sys.zenith.z100. $100 seems high to me given the
condition of this machines and the fact that it's a bare bones
configuration - i recently got one of these plus tons of software for free.
these puppies are heavy too so watch the shipping costs.
on the plus side: this is a very nice CP/M machine. S-100 bus; dual CPUs
(8085 and 8088) and much of the CP/M BIOS actually executes on the 8088
CPU! please reply to the original poster (not me). tx.
- glenn
From: "John Pfuntner" <mrbruno(a)earthling.net> 8/24/97 12:21
Subject: z-100 for sale (circa 1984)... cheap?
I'm offering the following dinosaur for sale:
Zenith Z-100 computer (bought as a student at Clarkson College in 1984):
256K RAM (I will also throw in the original 192K chips) Monochrome display
2 5-1/4" "Half-height" Floppy Drives Video memory for shades of grey *NO*
hard drive!
Software for above: DOS, Z-BASIC, Multiplan, Pascal/Fortran Compilers,
Turbo Pascal A few other disks with games and utilities.
Condition: good, a couple of keys don't work too well. Computer has not
been used in the past 6 years.
Price: I'm looking for $100 *plus* shipping but will consider any offer. I
want to get rid of it by December or else it will probably end up in the
computer graveyard.
For more info or bids, contact: John Pfuntner, pfuntner(a)pobox.com.
+=========================================================+
| Glenn F. Roberts, Falls Church, VA
| Comments are my own and not the opinion of my employer
| groberts(a)mitre.org
I know a guy who has a few old dumb terminals which are brand new in the
box (with the original packaging tape on them) circa 1982 or
thereabouts. I bought a couple from him at a weekend swap meet for $5 a
piece. He still has about 4 or 5 more. He also has a bunch of new in
box 3to1 or 2to1 switchboxes, as well as a whole mess of brand new
shielded serial cables, some in lengths of 20' and perhaps 50'. All this
will go to the dump unless someone wants them. He's willing to ship and
will take very little for them. So if anyone wants a brand new dumb
terminal or some cables, let me know and I'll pass you along his number
(I don't have it on me right now). He's local to me and I could arrange
to ship.
Sam Alternate e-mail: dastar(a)siconic.com
-------------------------------------------------------------------------------
Computer Historian, Programmer, Musician, Philosopher, Athlete, Writer, Jackass
Attend the First Annual Vintage Computer Festival
See http://www.siconic.com/vcf for details!
I just got some service manuals for the old Zenith system today and will
send you some info as soon as I read them.
At 10:03 AM 9/8/97 -0700, you wrote:
>Just when I think you can't find any genuinely old computer stuff in
>thrift stores anymore, I come across something that changes my mind.
>
>This weekend it was a beautiful, mint condition Heath H88. Don Maslin,
>keeper of the CP/M disk archives, has CP/M for the Heath H89, but
>doesn't list the H88. Does anyone know what the difference is between
>an H88 and H89? Externally, they look identical except for the badging.
>Are they software compatible?
>
>thanks
>
>Kai
>
>
>
> Opps! Read "floppy disk controller" for "hard disk controller" in the
> original reply.
Silly me; I assumed you meant "hard sectored disk controller". In this
case, a synchronous serial chip with its SYNC input attached to the drive's
Index pin.
Roger Ivie
ivie(a)cc.usu.edu
Wayull...I don't deal im Macs, so I don't know prices. I'm just passing
along what he wants. What's it worth?
$300!? I know its not april fool's day. I must have got a deal of the
century
when I got a mac ][cx and 3.5 drive for $25...
david
In a message dated 97-09-06 14:26:50 EDT, you write:
<< A friend (yes, Virginia, I do have a friend) has a Mac plus for sale. 80
MB
HDD (I think)...software includes Claris Works and some other stuff. He
wants $300 US, but will probably be willing to negotiate.
manney(a)nwohio.com >>
This one has a built in Percom floppy (the kind with the big door), so
it must be an H89. It says H88 on the back, but if an H89 is just an
H88 with the floppy controller + drive, then this one has been upgraded
to an H89. Cool, I'll order the H89 CP/M from Don.
The front badge just says "Heathkit Computer".
thanks
Kai
> ----------
> From: David C. Jenner[SMTP:djenner@halcyon.com]
> Reply To: classiccmp(a)u.washington.edu
> Sent: Monday, September 08, 1997 10:32 AM
> To: Discussion re-collecting of classic computers
> Subject: Re: Difference between Heath H88 and H89?
>
> Kai Kaltenbach wrote:
> > Does anyone know what the difference is between
> > an H88 and H89? Externally, they look identical except for the
> badging.
> > Are they software compatible?
>
> The H88 was a cassette-based Z-80 system. I got one by upgrading an
> H-19 terminal. (I believe you could also buy it as a system.) When
> you
> upgraded, you replaced the H-19 "badge" with an H-88 "badge".
>
> You could also upgrade the H-88 to an H-89 by adding a hard disk
> controller and floppy disk. When you upgraded, you replaced the H-88
> "badge" with an H-89 "badge".
>
> So, it's quite possible that not only do they look identical
> externally,
> they look identical internally. If what you saw DOESN'T have a floppy
> disk, then maybe it is the cassette-based system. Look inside. I
> have
> the cassette software, if you are masochistic enough to want a copy of
> it.
>
> You might be able to find a hard disk controller and make it into an
> H-89, if you like. It shouldn't be too hard to find a floppy drive
> that
> works, just plug in a DEC RX50 dual floppy! My H-89 has in fact the
> original prototype (DAM Drive) of the dual floppy, made by T and E
> Engineering. DEC later bought them out for the Rainbow/uPDP/uVAX,
> etc.
> If you need an RX50 drive, I can get you one.
>
> Dave
>
Just when I think you can't find any genuinely old computer stuff in
thrift stores anymore, I come across something that changes my mind.
This weekend it was a beautiful, mint condition Heath H88. Don Maslin,
keeper of the CP/M disk archives, has CP/M for the Heath H89, but
doesn't list the H88. Does anyone know what the difference is between
an H88 and H89? Externally, they look identical except for the badging.
Are they software compatible?
thanks
Kai
<Allison wrote:
<> The uVAX-II
<> offered 1meg of ram on card, FPU and a faster memory interface(PMI)
<> along with denser 1mb, 2mb, and 4mb (and later 8/16mb) cards. This made
<> a 5mb microvax-II possible in two cards instead of 7 using uVAX-I!
<
<AFAIK the MicroVAX I can't do 5MB no matter how many cards you have. It's
<a pure QBus machine; all memory lives on the QBus and there is no
<scatter/gather map to allow it to get to more memory than the QBus can
<address, which is 4MB.
Right you are. But in the context of what I said, you see that 5mb uVAX-I
was difficult for power and bus space reasons as well... the fact that
the microvax-1 didn't not have PMI(over the top memory connect) and Q22
could not address more than 4mb was just one more limitation. What happend
in real world cases is the total load on the power supply was way to great
or you ran out of slots!
The one I ran for a while back in 86 at DEC was 2meg running microVMS.
That box was full! 2 quads for the cpu, 2 quads for the memory, 1 quad
DHV11, 1 quad RQDX2, 1 dual for tk50, 1 dual for DEQNA, 1 RD53. The power
supply on that one ran at 95%. It was slow but I was one of the few with
a vax under my desk!
ONE ITEM: BA23 boxes have a cable from the power supply to the backplane.
There are two different ones. There is one with variable length wires that
looks neat and tidy making the bend. That cable is bad news! It was ECOed
back in the late 80s as the +5 and ground are parallel lines! The cable had
different length leads and the shorter ones having lower resistance would
hog all the current. This would cause a serious overload of the connector
pins with resulting is possible destruction of the power supply and
backplane. This would occur at less than rated load! The correct cable
has ALL of the wires the same length to circumvent this problem. The revised
cable was tested at 200+% of rated load and did not exhibit the failure
mode. So if you playing with MicroPDP-11s or VAXen in the ba23 box check for
that flaky cable and replace it if possible or at least check it for signs
of overheating at either connector. It's molex pins and if not damaged the
connector bodies can be reused.
Allison
Hi!
I have a lead on a computer, a Burroughs 6800, that is apparantly being
kept in a store-room and not being used. It seems I should be able to get
it if I asked. My question is - do I want it? Mostly I have limited
myself to micros, as they are small and fit my own interests, but I have
always been willing to accept larger systems. But as a result I know
nothing about Burroughs - is this thing huge, or what? Is it rare, common,
powerful or just dull? Any information would be greatly appreciated,
especially where it fits into the general history of computers.
Thanks heaps,
Adam.
Allison wrote:
> The uVAX-II
> offered 1meg of ram on card, FPU and a faster memory interface(PMI)
> along with denser 1mb, 2mb, and 4mb (and later 8/16mb) cards. This made
> a 5mb microvax-II possible in two cards instead of 7 using uVAX-I!
AFAIK the MicroVAX I can't do 5MB no matter how many cards you have. It's
a pure QBus machine; all memory lives on the QBus and there is no
scatter/gather map to allow it to get to more memory than the QBus can
address, which is 4MB.
Roger Ivie
ivie(a)cc.usu.edu
> From: adam(a)merlin.net.au (Adam Jenkins)
>
> I have a lead on a computer, a Burroughs 6800, that is apparantly being
> kept in a store-room and not being used.
Adam,
The Burroughs 6800 is a large mainframe. It will require 208-220v
3-phase power and probably air conditioning. I suppose you probably
don't want it.
Burroughs machines are rare, especially one this old. Burroughs had a
policy of taking back their old machines in trade, which they would then
destroy to avoid having used machines in competition with their new
ones. It is an interesting machine historically, although possibly not
the most interesting in the line which is now called the A-Series.
Probably about the first in the line was the B5000. The famous early
machine was the B5500, there was one at the University of Wisconsin and
it was about the first machine I ever used. I remember one of the UW
professors contributed to the 6800 architecture (suggestions, at least)
and there was a big fuss about whether to get it or a Univac. They ended
up with the Univac 1108. The 6800 was to have been a big improvement
over the 5500 but was quite late or something.
The A-series computers are stack machines. Its a very interesting
architecture. At the time of the B5000 series it was considered ahead of
its time, but now that architecture is essentially dead. The most recent
new stack machine I know of is the original HP 3000 minicomputer from
the late 70's early 80's. It is inherently difficult to get a stack
machine to run very fast, like today's superscalar microprocessors. But
a stack architecture results in small code. The virtual machine for Java
byte code is a stack architecture.
There are a number of other historically and architecturally interesting
things about the Burroughs A-series line and probably the 6800 in
particular. If you remember TRON, the evil "MCP" gets its name from the
Burroughs operating system (Master Control Program.) There is a
Burroughs thread running at the moment in alt.folklore.computers.
Please find out if its just the machine or if there is documentation
and/or software. I would like to see the whole machine saved, but if
that turns out to be impossible at least maybe good docs can be saved.
Ideally there would be hardware manuals including user reference manuals
and schematics, diagnostic software and manuals, operating system and
application software and manuals. Possibly if the closet contains only
the machine other folks may have documentation in their office.
If you don't want it I would be very interested, but if you are in
Australia it could be very expensive to haul it back here. Please keep
in touch and let us know what you find out.
Paul Pierce
http://www.teleport.com/~prp/collect/
I know someone locally who's trying to sell a complete boxed Commodore
Plus/4 for $25. If anyone's interested I'll hook you up with him.
Sam Alternate e-mail: dastar(a)siconic.com
-------------------------------------------------------------------------------
Computer Historian, Programmer, Musician, Philosopher, Athlete, Writer, Jackass
Attend the First Annual Vintage Computer Festival
See http://www.siconic.com/vcf for details!
I spent the morning at an auction and got the following;
1. IBM Powerstation 320 with a 19' monitor 6091-19 with cable (3 BNC),
anyone having some info this unit I could use it. Can't get it to show
anything on the monitor. All lights are on.
2. IBM Powerstation 220 with 17" monitor this unit is locked in service mode
and I did not get a key. Any info this one would be great.
3. MAC LC III with full display monitor unit works and is loaded with software.
4. MAC SE FDHD works great and is also loaded with software.
5. Apple TechStep testing unit with case, manuals, software, and cables. Now
I really do some unit testing.
6. About 10 very large boxes full of IBM PS/2's and other parts. I have
very busy weekend with these boxes.
well that's it. see ya
The floppy drive incidently, works on other c64's just fine, and I have
cleaned and calibrated it.
----------
> From: jpero(a)mail.cgo.wave.ca
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: Re: Sick C-64c
> Date: Monday, September 08, 1997 4:38 AM
>
> > Date: Mon, 8 Sep 1997 08:22:06 -0500
> > Reply-to: classiccmp(a)u.washington.edu
> > From: "Bill Girnius" <thedm(a)sunflower.com>
> > To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
> > Subject: Sick C-64c
> > X-To: "Classic" <classiccmp(a)u.washington.edu>
>
> > I recently aquired a stack of c64's, these are the old brown type. Of
(4),
> > One works fine, 1 boots, and can run catridges, initializes the floppy
on
> > boot, but can never access it after boot, the other two have power but
no
> > video. Any ideas on these folks?
>
> Checkerboard or no display usually means memory is bad, replace all
> 64k ram chips.
>
> Oddball problems usually traced to the VIA ic's blown by unbuffered
> lines. Real easy to do to blow it if careless!
>
> Make sure you put the shield back on with those finger "pads" coated
> with bit of heatsink paste on them, they're like poorman's heatsinks!
> The video IC get brutally hot!
>
> Monitor the voltages for stablity and good idea to replace those big
> capacitors just in case. The floppy drives I think is belt driven
> type and needs bit of cleaning. I had a problem with one, inside
> that small can there's 2mhz crystal and one TTL chip, That TTL chip
> was baddie.
>
> Jason D.
> From: Greg Mast <gmast(a)polymail.cpunix.calpoly.edu>
> > Subject: Re: FS: Mac Plus
>
> > 20 of them just got trashed, but if you want a couple I'll be stopping
in
> That's amazing! 20 computers probably worth at least $25 each tossed in
the
> dumpster? What a waste! $500! Mac plusses are really still good machines.
I
> managed my business using Excel, Word and quicken on one until a couple
years
> ago (until I sold the business). The local shop here parts them out for
repairs.
There are regular wanted ads in Austalian newsgroups from a guy who turns
them into fishtanks. Apparently a whole bunch of people do this.
> Date: Sun, 07 Sep 1997 08:39:09 -0500
> From: "John R. Keys Jr." <jrkeys(a)concentric.net>
> To: classiccmp(a)u.washington.edu
> Subject: Re: FS: Mac Plus
> 20 of them just got trashed, but if you want a couple I'll be stopping in
> the shop later this week and if they have a new batch in I will pick you up
> a couple. We can settle up after I get them. They also have alot of SE's,
> 512's, and sometimes the 128's. There is also a thrift store here that
> sells all computers for 80 cents including taxes. Everyone has started going
> here and it's getting harder to catch any good machines there. If anyone
> reading this is looking for HP stuff let me know as I passed on a complete
> HP3000 for $10.
That's amazing! 20 computers probably worth at least $25 each tossed in the
dumpster? What a waste! $500! Mac plusses are really still good machines. I
managed my business using Excel, Word and quicken on one until a couple years
ago (until I sold the business). The local shop here parts them out for repairs.
I did see our goodwill toss a Radio Shack Model 4P(??) and an Osborne the other
day alond with a pile of PC Jr's and Commodore stuff. I almost grabbed them
until I remembered I have a pile to get rid of and no time to play with them.
Every Friday they clean (dumpster) the electronics section.
