I am pretty sure it's for an Apple II or Franklin clone. says "CH" as
the manufacturer and has a DIP plug on the end of the cable.
$8.00 shipped in the US.
http://tinypic.com/view.php?pic=25ssvue&s=5
thanks
Charles
>>> Incorrect I can see, but how can you be "unethical" with a gearbox?
Marchant contends (with a bunch of evidence, not speculation) that Price made some important technical decisions that were easy and emotional, rather than professional and scientific.
Price's "Gears from the Greeks" is still the most * popular * article about the device, because for a very long time it was the only article. But a large amount of new research in the past few years uses much more advanced technical imaging and includes analysis of forgotten pieces of the device to which Price never had access -- pieces that severely change the device's story.
Actually, the factory fix was a "bucking transformer", a whole second power
transformer installed out of phase in series with the primary power
transformer so that the voltages were subtractive. There is a factory ECN
on this topic. But the bridge regulator solution was common among the user
base (I myself have used it) as a lot simpler and cheaper, and almost as
effective.
------------------------------
Message: 3
Date: Sat, 28 Feb 2009 11:07:56 -0600
From: Jim Battle <frustum at pacbell.net>
Subject: Re: S-100 power supply voltage ranges
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Message-ID: <49A96F6C.6060602 at pacbell.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Chuck Guzis wrote:
> All of the S100 boards I've seen use simple linear regulators, so you
>
> need some headroom--but not too much. A lot of S100 7805s and LM323-
> 5s were operated within an inch of their maximum current ratings (some
> had bypass resistors installed) and generated a lot of heat. I
>
> wouldn't run the supply rails any higher than I had to.
>
> Cheers,
> Chuck
>
>
The Sol-20 had an app note about this problem. Apparently they shipped them
for a while with transformers that were out of spec with the end result that
the unregulated power ran high. The recommended fix was to take a power
bridge, mount it to the case, and wire it in series with the positive
voltage run in order to get a ~1.4V drop.
> Please mail me, if you are interested in the data i was reading from the ROMs.
> It is in Binary format.
Sorry to post this here, but email to the address you used appears to be bouncing.
I'm interested.
>
>Subject: S-100 power supply voltage ranges
> From: "Andrew Lynch" <lynchaj at yahoo.com>
> Date: Sat, 28 Feb 2009 10:03:10 -0500
> To: <cctalk at classiccmp.org>
>
>Hi! What are acceptable voltage supply ranges for an S-100 power supply? I
>am assuming 115VAC input. My intended application is a small home brew
>S-100 backplane.
>
>I have seen the S-100 voltage rails vary but I believe +15VDC, -15VDC, and
>+9VDC would be sufficient. Herb's S-100 page lists the voltages as +18VDC,
>-16VDC, and +8VDC but I have seen other voltages used.
>
>Thanks and have a nice day!
>
>Andrew Lynch
The minimim voltages are +8, +15 and -15 or otherwise said at least 3V greater
than the on card regulator.
The maximum is generally +10, +18, -18v the caveat here is while most of the
regulators used will accept up to 25-30V excessive voltages leads to overheating
especially on the +8 buss where the highest current users are.
Ideally well filterd voltages at the minimum on the +8V, +15V busses are desired
and there were a few S100 boxes that did exactly that.
Allison
>
>
>> I am assuming the problem relates to following a lxi sp instruction
>> immediatly with a call instruction, I can see how pipelining
>> instructions could cause this failure. I cant immagine how calling
>> the address which happens to match the sp would be an issue.
>
>
>As far as we could determine, it was precisely the issue.
>> My thought was that most cp/m programs either left the sp alone, and used
>> the stack provided by cp/m, or set up a local stack early on in the
>> program. In either case this bug could be completly avoided. Am I wrong
>> here? Is the bug related to calling the address which happens to be in
>> the sp?
>
>
>Again, yes.
I am sorry I am so slow here. Which is the problem? The value or the sequence?
>Probably not a bug, but definitely a factor in determining if I
>should have bothered to use the V20/30 for emulation at all.
>Certainly, I wondered if the lack of Z80 instruction set support
>would have been an issue. It was--and I supplied a software emulator
>for that. Fortunately, I also included an software 8080 emulator, so
>even users of JRT Pascal weren't left hanging.
The Z80 thing is an interesting point. Before I started running CP/M on a V20, I allways ran on a 8085. I would get annoyed when cp/m software required a z80, because it was not a z80 operating system. I later did build a few z80 systems, a laptop and a 20mhz sbc system, but all of the coding I did for them was 8080, except for using the 16 bit io address features of the z80.
>To clarify my point, would you try to run CP/M on a Rabbit uC with
>all of its "we're just like a Z80 except when we're not" instruction
>set? I've never tried, as the compatibility issues are just too
>severe.
I assumed the rabbit was a z180, you learn something new every day. I have done a few designes with z180's, but I cant even rememer what language tools I used at this point.
Les
--------------------------
Hi Vern and Randy,
I'm also interested in the Antikythera project. I _think_ I ordered the book, "Decoding the Heavens," but I won't know until it actually arrives. Ordered it indirectly via Amazon.com, but my money was soon quickly and unceremoniously refunded. I think and hope I then found another copy via bookfinder.com. I recently received an email claiming that it has been sent.
Making something like this must be pretty prohibitively expensive wouldn't it?
Still, I am interested.
Thanks,
Robert Greenstreet
Message: 1
Date: Sat, 28 Feb 2009 10:39:50 -0800 (PST)
From: Vernon Wright <vern4wright at yahoo.com>
Subject: Re: Antikythera fans
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID: <278829.9301.qm at web65503.mail.ac4.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Hi Randy,
I responded quite favorably to your proposal. I'm wondering whether you got any other people really interested in the Antikythera device, and whether you are going to go on with the project.
It'll probably be a couple of months before my shop is workable again; moving and all that. But I am interested.
Regards,
Vern Wright
--- On Sat, 2/21/09, Randy Dawson <rdawson16 at hotmail.com> wrote:
> From: Randy Dawson <rdawson16 at hotmail.com>
> Subject: Antikythera fans
> To: "classic computers" <cctalk at classiccmp.org>
> Date: Saturday, February 21, 2009, 7:30 PM
> wondering if you guys love this as much as I do.
>
> I would like to make a user group/club for it if there is
> enough interest
>
> For myself, I am fully equipped here with machine
> capability and stage one is to make the model (2005) as
> currently known.
>
> Stage 2 is heck make these in volume, its a marvelous thing
> and may be profitable.
>
> You cannot find a better classic computer than this.
>
> Randy Dawson
Hello Mr. Lynch,
I found your N8VEM project on web. I'm interested in JUHA SD interface for my own computer (http://homecomputer-ddr.de.vu/z9001/z9001_sdcard.htm)
It is possible to get contact to Mr. Juha for some special questions?
Sincerely yours,
Volker
(I send this email once again, now with header)
--
Mit freundlichen 8 Bit
Volker Pohlers
homecomputer-ddr.de.vu
- Z9001, Z1013, LC80, ... -
Computer Bild Tarifsieger! GMX FreeDSL - Telefonanschluss + DSL
f?r nur 17,95 ?/mtl.!* http://dsl.gmx.de/?ac=OM.AD.PD003K11308T4569a
Hi all; I realize that this sorta overlaps with a previous thread or
two, but I thought I'd start a new one rather than practice
necromancy.
So, I've got both a VAXstation 4000-60 and an AlphaStation 250 here
and after playing with it for a bit I've decided I don't really care
for VMS so much that I want it on both of them. I'd like to find an
interesting, preferably AT&T-style UNIX to run on one of them, so I'm
hoping some of you can help me figure out my options. So far, I know I
can run:
-NetBSD
-Probably some DEC/HP UNIXes (Tru64 on the Alpha?).
I'd really appreciate perspectives on these different systems,
user/admin experience, etc. I'm not looking to accomplish anything in
particular here, I just want something to play around with on my DEC
hardware while I wait for the PDP-11 :)
Thanks
John Floren
--
"I've tried programming Ruby on Rails, following TechCrunch in my RSS
reader, and drinking absinthe. It doesn't work. I'm going back to C,
Hunter S. Thompson, and cheap whiskey." -- Ted Dziuba
Hey, all:
I'm hoping for some info about older micros and heat failure. We have an
archaic system at work which is going stupid on us, and we're looking at
repair-or-replace options.
Let's say you have a system which is locking up due to heat problems. I
suspect we've all seen that from time to time. We're talking failures
where you can cool things down and reboot and the system comes back and
works again, not failures where things are visibly melting and/or
burning. :)
Is there a "typical" mechanism by which heat causes a system to go south?
If you get a system which is knocked out by heat, does it make it more
prone to being knocked out by heat in the future? In other words, do heat
failures make a system physically more susceptible to more such
failures - is the damage cumulative?
Any relevant info appreciated. Thanks!
-O.-
