<Compupro made a Z80 slave card that supported between 64K and 256K or RAM
<that had a RS-232 port. If I recall correctly you could only put 8 of thes
I don't see it in my old catalogs. the closest one was MPX-1 with an 8085,
16k ram, Transient master and interrupts(8259a).
Teltek, Konan, Macrotek and SDS did make them however.
<There was another method of placing multiple CPU on your bus. That basical
<ment building a Single Board Computer (SBC) that could use the S-100
<Temporary Master Access (TMA) hand shaking. The S-100 supported up to 16 o
<these TMA on a bus. The advantages is the TMA's tended to use the bus more
<efficiently comparied to slaves boards with requried a bus master present
<servicing them. I don't know who use to make SBC that fully IEEE 696
<standard for TMA access but do know that they were out there.
Been there done that. Used 4 z80s in a symetrical loosely coupled
multiprocessing system. One requirement is local and public pool memory
that any DMA (device or transient master) can address.
Allison
An aside, if anyone is interested in a IIgs, IIe, or Atari 800, please let
me know; there's a thrift shop hereabouts with them.
FYI... Reply to:
>From: DUpah19927(a)aol.com
>I was browsing through your web site about the old computers that you
collect.
>I have a couple of old computers myself that I am looking to sell. If you
>would like to have them or know of anyone else that would like them, please
>let me know.
>
>I am attaching the pictures of the computers I have right now. The first is
>an Apple IIc+. The other is an Epson Apex, built in 1980.
>
>Let me know,
>D
>
>Attachment Converted: "C:\DOWNLOAD\ATTACH\EPSON.zip"
>
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
roger(a)sinasohn.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.sinasohn.com/
>I have an old IBM motherboard in front of me, and not really sure if it's
>worth keeping/trading or (gasp) trashing. It's marked "16KB-64KB CPU" on
>the top, 3 of the 4 banks or RAM are occupied. IBM chips are dated
>1981/1982. Otherwise I don't really know what to look for in identifing
>this.
Well I'd keep it.
Thats the original IBM PC motherboard. The only other question would be
which of the first few bios revisions it has.
Speaking of wooden laptops... check out
http://www.luddite.com/ludditehome/product.html
- Joe :-)
----- Original Message -----
From: Nev Dull <nev(a)bostic.com>
To: /dev/null <nev(a)bostic.com>
Sent: Thursday, February 04, 1999 1:05 PM
Subject: HTML O' The Day
>
>http://www.luddite.com/
> ... the finest in custom wooden computing.
>
Computers do what you tell them to do, not what you want them to do (some of
us can manage both;)
Francois
>A classic misconception, fostered by humans... When your bill is wrong,
>your bank
>account balance screwed up, your paycheck short.. They say IT WAS A
>COMPUTER ERROR!
>
> Will
>
>
>Max Eskin wrote:
>>
>> Hi,
>> I'm thinking of putting together an FAQ-like document intended to combat
>> the stupid ideas people have about computers. So, does anyone have any
ideas
>> for common misconceptions about computers that I should address? So far,
I
>> have the places various things originated (i.e. IBM did _not_ invent the
>> PC, Apple did _not_ invent the GUI, etc.)
>>
>> --Max Eskin (max82(a)surfree.com)
>
I don't think that 2/5/99 is a more valid date than 5/2/99
Anyways the Europeans got it right you are the one writting the date
backward. The proof is that everyone in europe places the day first so they
must be right. Hint the Europeans go in increasing relevance: day/month/year
and not the very unelegant month/day/year. Why don't you set the time in
Minutes:Seconds:Hours while you're at it?
Francois
Disclaimer: I've adopted the US standard now but I think it sucks.
>Are you sure you're entering the time in the "correct" format (i.e. not
>like those silly Europeans who put the day before the month?)
>
>Sellam Alternate e-mail:
dastar(a)siconic.com
>---------------------------------------------------------------------------
---
>Always hasslin' the man.
>
> Coming in 1999: Vintage Computer Festival 3.0
> See http://www.vintage.org/vcf for details!
> [Last web site update: 01/15/99]
>
I have a chance to get an old system but I'm having trouble locating info
for it....
It's a homebrew (s-100??? mounted on plywood for chriscakes). Thinker toys
Wunderbuss, 11 slot mb, 2x8" drives, 2x(stringy?)wafer drives, alot of
wirewrap boards... maybe a punchtape/reader :) !!!
Can anyone give me more/any info on this type of setup??
Thanks
- Mike
Marvin <marvin(a)rain.org> wrote:
> BASIS Incorporated
> 5435 Scotts Valley Drive
> Scotts Valley CA 95066
> (408) 438-5804
>
> This would seem to imply that there should be quite a few more over here
> somewhere.
Hmm. I'm just flipping through some issues of the First Basis Users
Group newsletter, and it looks like Basis in Scotts Valley was out of
business by October 1983 (with its inventory being bought by an
"investor" and re-sold through a couple of other companies on west and
east coasts), and other attempts at establishing a distributorship
through other US-based companies met with varying degrees of failure,
with the end result being that if you wanted a Basis you had to buy it
>from Basis in Germany or find a dealer willing to do that for you.
And it looks like there was some sort of Basis in Germany into at
least 1987 when I run out of newsletters.
But yeah, I have one, a friend has one, he had another one when he
lived back east, I've seen others go by, and they were very nice
machines, superior to Apple ][s in several ways. So I don't think the
108s are that uncommon in the US. A 208, now....
-Frank McConnell
> so don't get the idea that you can
> run it in your house or garage.
My parents have 3-phase electricity at home, but I don't (yet). But I
think it's more common in the UK than in the US. (BTW my parents have a
16th century farmhouse which they heat electrically during the winter.
Maximum load we've measured, 36kW.)
I am told (I think it was Toy Duell first pointed it out to me) you can get
reasonable 3-phase using a largeish induction motor (say a mechanical
rating 2 or 3 times the electrical load you want to connect), without a
mechanical load: wiring one phase to ground, a second to line, and the
third to line through a capacitor for an approximate 60 degree phase shift.
The induction motor will also act as a generator, and produce enough emf to
tidy up the phase relationships and voltage imbalance. But be warned - you
will not have the right voltage, and one of the phases (rather than the
star point) will be at ground potential. A bank of three single-phase
isolating transformers should do the trick if either of these is critical
(a single autotransformer, upstream of the converter, will also work if
only voltage is critical.)
Also be warned. I am confident that this works _in theory_ but I have
never tried it.
Philip.
