This sounds about right.
If I counted the number of characters before the repeat, couldn't I then
identify the stuck line?
Then, perhaps... I could go to the hardware? Am I making sense?
A
-----Original Message-----
From: Allison J Parent <allisonp(a)world.std.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Sunday, February 22, 1998 11:57 PM
Subject: Re: BBC Model B - video help
>Unlikely but possible. More likely is a memory address error. A stuck
>address line will cause data to repeat 2*n times in the display memory.
Hey!
I just landed pieces to an 1802 kit! I've got everything but
the hex keypoad and power supply (though I'm sure +12, +5, -5 would
do the trick). This is not one of those single board computers like
the ELF-II, it's made up of several boards which connect to the main
unit via ribbon cables. Here are descriptions of the boards:
Primary board with 1802
labled "Infinite"
Part Number UCE100001
dated 1976
This board has a rather large crystal which appears to run at
135khz (if I'm reading the markings right). A large blue 3000 MFD
capacitor, some smaller disk .01 uf capacitors, and these chips:
4) RCA 701 CD4001AE
1) RCA 631 4049AE
2) 2606B (I think this is the 256 bytes of RAM)
The board also has a two sided 36 connector per side edge
card, which connects to nothing. Next to the 1802 is a red ribbon
cable which attaches to another board containing four LED readouts and
a singfle LED light (attached to the Q bit I suppose). Each LED (but
the Q light) has F9368DC 7705 - one for each LED). The second board
is listed as INFINITE 1976, UCE30004.
On an unattached board are two LED's, four chips and a 24 pin
socket (empty - I guess for a monitor ROM). This chips are:
2) RCA 701 CD4001AE
1) M1-0110-5 (7649)
1) MC14013CP (7438)
The last unattached board contains three switches and three
buttons, with a metal faceplate labeled UC 1800. The buttons are
labeled Reset, Start/EF1, and Enter, the switched are labeled ON/OFF,
STNDBY Power, and Load Mode. This board also has four chips:
3) MC14013CP (7438)
1) RCA 636 CD4011AE
Both of the unattached boards connect to the primary board via
a ribbon cable terminated by a 14 pin DIP; there are two 14 pin DIP
sockets on the primary board. It's unclear which board should be
plugged into which socket.
I also snagged pices to an SC/MP kit, along with a bunch of
DOCS and old COMPUTE newsletters dating from 1978 or so (WOW!). Also
got a COSMAC Microprocessor Product Guide (think I could call up RCA
and order any of the things listed therein????? - HA!), and an
original RCA 1800 Users manual (WOW!), in almost pristine condition.
As a kid I put together an ELF-II in 1980 (I was 12), so I
have some familiararity with this line of processors (could never get
over the gethi instruction yuck yuck yuck). Looks like I need to put
together a hex keypad and P/S to get this up and running. Anyone have
any ideas? Also, this things is missing the CDP 1861 video driver
which my old ELF-II used to have - what's up with this? I wonder what
happened to all those old late 70's kit manufacturers... I don't see
any FAQs out on the net for those old ELF's, KIMS, SYMS, and AIMS. Oh
well, relpies by the curious and knowledgeable would be most
appriciated.
Thanks!
J. Maynard Gelinas
Well, at the hamfest yesterday I got a VT220 terminal, an HP-IL/HP-IB
converter(maybe now I can use my HP 2225B...), a Laser 128 with two
monitors(broken Zenith and working Apple Monitor III) two disk drives(Apple
Disk II and a clone) a box of Apple II cards(mostly printer cards), a Hayes
Micromodem II(110/300bps switchable, Apple II card and a box that sits
outside the computer), two huge 9600bps leased line modems(kinda useless,
but they were free!), an IBM 3180 terminal keyboard(but no terminal...),
and of course I couldn't leave without getting a battery for my TH-205
radio. Everything seems to work except the VT220 keyboard and the Zenith
monitor, and I have no way of testing the modems but they ligth up when
plugged in, and I'm hoping that the 3180 keyboard will work with my 3191...
-JR http://members.tripod.com/~jrollins/index.html - Computers
http://www.geocities.com/Area51/Lair/1681/ - Star Trek
I have a non-working Radio Shack Model 12 computer, some software, and some
documentation that I would gladly give to someone who could use them. I
don't think that the unit would be worth the cost of shipping as the
computer is probably useful only for parts for someone who has one already.
I know that one disk drive (it has two 8-inch drives) is bad. It was
physically ruining diskettes by scraping off the coating in a ring toward
the center of the diskette. In the process of inspecting the unit to check
out the drives, I managed to break off a nub of glass near the CRT socket
and the vacuum seal was broken. If someone wanted to fix this unit, he
would need one good 8-inch, half height drive and a new CRT. So far as I
know it has one good drive, a good motherboard, power supply, keyboard, and
whatever other electronic boards as might exist (I don't remember). The
computer was working at the time I finished it off mechanically except for
the bad disk drive.
I also have the Model 12 Owner's Manual and TRSDOS-II Reference Manual, a
brand new copy of TRSDOS 2.0B Version 02.0B.00 from Radio Shack special
orders dept., a copy of Pickles and Trout CP/M for the Model 12, and a copy
of SuperCalc 2 with P&T CP/M. I also have a plastic dust cover for the
Model 12.
I live in the Chicago area. If anyone is interested in picking up the unit,
send me an email, and we'll make arrangements. If someone wants the unit
enough to pay the cost of packing and shipping via Mailboxes Etc., I'll
check into costs, but I doubt that it would be a good investment. Let me
know of any interest.
Gerald
At 02:11 AM 2/22/98 -0500, you wrote:
>> <No, it's just something about REALLY LARGE frontpanel boxes that rules.
>> <The KA-10 is plain awesome.
>
>Yes, frontpanels do. It is a shame that no computer has had one since the
>1970s. There just is no need for them anymore.
>
>What was the last machine to have a switch register and lights? The oldest
>I can think of is one of the HP1000s (help me with the model number!).
HP1000s with front panels:
2114
2116
2108
2112
2109
2113
2111
2117
The 2117 was the last of the family. Its also known as the 21MX F series.
The 2114 was the first. A huge 4K of Core memory...
2108 and 2112 were the original MX family
2109 and 2113 were the MX-E series
2111 and 2117 were the MX-F series.
There were a few more flavors as well used in combination with instruments
like
the 2105A.
Regards,
Don
>Date: Sun, 22 Feb 1998 00:41:45 -0500
>Reply-To: classiccmp(a)u.washington.edu
>From: Ward Donald Griffiths III <gram(a)cnct.com>
>To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
>Subject: Re: Future Computing Trends
>
>Max Eskin wrote:
>>
>> I agree wholeheartedly with all you say with one exception. I have a
>> Pentium 75 overclocked to 100, 16MB ram. It runs Word 95 just fine,
>> and ran it fine when it had 8MB. Visual Basic and IE4 (I don't use
>> it regulary, Opera at www.operasoftware.com is much better: 1MB
>> download!)
>> work fine too. I can only imagine how Linux would run. But to put
>> this in a classical context, I agree that old computers are still
>> useful, but I so wish that they had better displays :)
>
>I defy _anybody_ to say that a "better" display would improve any
>Big Five Software arcade games as they ran on the 128x48 monochrome
>graphics of the TRS-80 1/3. And I defy anybody to find a better
>batch of arcade games, unless you really want to see the blood from
>kicked-in faces, a fetish I outgrew 25 or so years ago.
>--
Who says I want it for arcades? I don't play games much anyway.
Whatever happened to desktop publishing, CAD, photoediting?
What mostly annoys me is how little I can fit on an 80X25 text mode
screen compared to 1280X1024 resolution and small font.
>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
On Tue, 3 Jun 1997, Sam Ismail wrote:
> On a scarcely related note, has anyone ever seen (or does anyone have) a
> TI-99/4 (no "a")?
Andrew Gurudata has a page devoted entirely to the TI-99/4 at:
http://www.vex.net/~guru/ti/ti994nota.htm
--------------------------------------
Rich Polivka
Alternate e-mail: copguy(a)geocities.com or ti994a(a)technologist.com
TI Home Computer Page: http://w3.gwis.com/~polivka/994apg.html
My Ohio Police Pages: http://www.cop-spot.com/~OhioBlue
------------------------------------
I went to a trift store and found an interesting looking 5 1/4" disk. It's
copy righted to Vector Graphics and Digital Research and is labeled Vector
4 CP/M Version 1.0 Release 2. Does anyone know what it's for?
Joe
the 9533 i had was preloaded with os2 but now i'm running pcdos7 and win3.11
just fine. i trying to get a pcmcia nic to work but having problems. the nic
worked in my thinkpad but i dont remember how i had my autoexec.bat and
config.sys set up.
i do not remember the memory inclusions and exclusions that need to be set up.
david
<< What kind of networking problems are you having? Do you have the PCMCIA
model? Some of them had a token ring card instead of PCMCIA.
Obligatory 10-year-old-plus story: HSC also has a DG/One (I think they
want $45 for it) and an odd-looking Morrow portable that wasn't in very
good shape. I passed on both, so if anybody is looking for these things,
check with these guys:
http://www.halted.com/
-- Doug >>
I asked about this one a little while back.
Nobody knows what it is, apparently.
Datanumerics DL8A. It is 8080 based,
comes in a 19" rack mount case, has 4k 600ns ram, 1 current loop (I
think) port, and obviously a full front panel.
I ended up paying about US$150 for the DL8A, a Compucolor 2, and a PET 2032
A log? Maybe, but I'm curious about the DL8A. If there's any interest,
I'll place images on my website when it arrives.
A.
