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Hi, this is "Dave Dunfield" - best known here for being the site owner of
"Daves Old Computers" and the author of "ImageDisk"
No longer have the email I used to use to access cctalk... (hence the
change)
Just in case anyone is interested:
I've been working on a "retirement" project:
I am publishing some 40+ years worth of source code to "stuff I've written".
This includes my DDS products, lots of "internal tools and utilities" and
other misc. "stuff". Of special interest to cctalk members, this include my
Altair, Horizon, H8, D6809, MOD8, ImageDisk and some other related
material.
Most of it is C (mainly for my own compiler - one of the items), some in
assembly, and a few "custom languages".
Available from my personal site:
https://dunfield.themindfactory.com
or go to: "Daves Old Computers" -> "Personal"
Please note that I no longer monitor these forums on a regular basis.
Anyone wishing to reach me, please see the "contact" link on my site.
Dave
--
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Search "Dave's Old Computers" see "my personal" at bottom!
Sorry if not linked correctly - looking through the list via the archives..
"reply" option doesn't seem to work (at least for me - older Chrome)
>but my understanding was that the 4004 and 8008 were effectively developed
>at the same time? And were announced or available about within one month
>of each other?
I believe they were, although I never had much experience with the 4004...
I did play a bit with the 8008 - and wrote a simulator/emulator for the
8008 system I had, a Canadian:
MIL (Microsystems International Limited) MOD8 (Modular-8)
it was also available as:
GNC8 (Great Northern Computers) 8008
You can get MOD8 simulator from "Daves Old Computers" and actually
experience
using an 8008 based system including the built in "MONITOR-8" ROM software
as
well as "Scelbi 8008 BASIC" (one of the earliest) - source to both
provided.
If you care to, I included ASM88 (my 8008 cross assembler) so you can try
writing and running 8008 code!
-Be aware that MOD8.COM itself is pretty old and is 16-bit DOS software.
This means it WON'T run under modern Windows, but it does work well in
DosBox (I recommend the one I have on my site)
Dave Dunfield - https://dunfield.themindfactory.com
--
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Search "Dave's Old Computers" see "my personal" at bottom!
Folks,
While looking for something else I found few iPaqs. There are two later
models, mud coloured with plastic screen covers both work fine. Sadly the
silver one with the battery has a broken clip, so you need to secure it some
how works if you do this. The one with the missing door does nothing. There
are two power bricks, one USB lead, one docking station. No stylus. Can't
remember when I last looked at these. Free collection from Manchester.
Dave
> Rob Jarratt 25 Nov 2023 8:47 a.m.
> Of course the worry is, why? There could be a fault on the board.
> I am hesitant just to replace the fuse and try it...
An older CRT terminal is probably a bit too much current draw for this, but
you can prob use it in a setup to test parts...
A very handy gadget you can make very easily, which I use all the time when
testing small devices in "unknown operational state" is a simple current
limiter. (following discussion based on North America power, numbers may be
different if you are in a different part of the world).
The "smallest" typical line circuit is 15A which is more than enough to
cause
damage to small devices experiencing excessive power draw through a fault
(often indicated by a blown fuse).
The "limiter" relies on the fact that an incandescent light bulb will
draw/pass
a fair bit of current when it is cold, and much less when it's warm. (this
is
because they are designed to "turn on" fast)
In my case, I have three light sockets wired in parallel, all in series with
the hot side of a receptacle. This lets me change from a single 25w bulb
(very
little current possible) up to 3 100w bulbs (a good part of amp before it
seriously limits). For example, 100w bulbs draw .833ish (100/120) when
operating fully lit - x3 = 2.5A max current - this would only happen if the
device under test was "shorted", presenting 0 series resistance and would
therefore effectively have 0 volts across it.
In practice, you could prob. draw 1/2 amp (160ish ma per bulb) without
warming
them "too much" to seriously drop a lot of voltage. Much more than that and
the
bulbs will light up rather than hearing "popping" sounds from the device
under
test :-)
-- Btw, I've given most of my CRT terminals away - For VT100's I use my
"PC100"
program - It provides very good VT100 emulation using an old DOS (or DosBox)
PC - it remains "text" mode, so it turns "smooth scroll" into "slow scroll"
and
large fonts into "double spaced" fonts - but in all other respects nothing
I've
used it on has been able to tell it's not an actual VT100!
(I'm sure there are better/graphical VT100 emulations "out there")
Dave
--
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Search "Dave's Old Computers" see "my personal" at bottom!
Hello list,
there is a PDP 11/23 Plus with two RL02 drives available near Stuttgart, Germany.
The configuration corresponds to the one shown here:
http://www.cosam.org/computers/dec/pdp11-23/cabinet.html
Contact me off-list if you are interested.
Cheers,
Pierre
-----------------------------------------------------------------------------
http://www.digitalheritage.de
Not a COMPUTER but I have a Pro-log M900 EPROM burner that has a second source INS4004 on the board. This isn't my M900 (my INS4004 is white/gold), but here is a view of the board/chip: http://www.wolfgangrobel.de/programmer/img_m900/m900_06.jpg
-W
Date: Wed, 22 Nov 2023 09:36:19 -0500
From: Paul Koning <paulkoning(a)comcast.net>
Subject: [cctalk] Re: Intel 4004(sp?)
To: ED SHARPE <couryhouse(a)aol.com>, "cctalk(a)classiccmp.org"
<cctalk(a)classiccmp.org>
Message-ID: <7ECB8A1C-DB41-45E7-9416-F71AD3289C94(a)comcast.net>
Content-Type: text/plain; charset=us-ascii
> On Nov 22, 2023, at 3:51 AM, ED SHARPE via cctalk <cctalk(a)classiccmp.org> wrote:
>
> Was there ever a COMPUTER using a 4004 that you cud really do something or did tat finally arrive with the 8008 as in the skelby shelby sp? 8008 i now there was an Intel INTELIC 4 (?sp) could n that use 4004 or one of the later 4000 numbered proc. We have an intelec 8 and 8 inch floppy drives here at smecc musem .... always wanted a 4!Ed
Don't know about commercial products. But a classmate of mine got Honors in Independent Study for a project where he built a useable general purpose computer out of a 4004, plus a boatload of other stuff. It filled a wire-wrap panel board about 8 x 10 inches. He wrote some software for it as well, and took it to a summer internship at one of the National Labs (in the Midwest -- Argonne?) where as I understand it they liked it enough to ask him for a copy of the system. He graduated in 1975, so the work was done in the year or so leading up to that.
One complication was the terminal I/O (Teletype 33); originally he had a bit-banging interface for that, which isn't easy on a 4004. At some point he finagled a UART chip out of one of the DEC field service engineers, I think that was one of the first single chip UARTs, used in the earlier DEC PDP-11 terminal adapters.
paul
