>
>Subject: Re: newbie building a scratch-built computer
> From: Dave McGuire <mcguire at neurotica.com>
> Date: Sun, 05 Aug 2007 14:43:16 -0400
> To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>
>On Aug 5, 2007, at 12:17 PM, Chuck Guzis wrote:
>> For that matter, why bother with UV erasers and UV EPROMs at all?
>
> Sorry to jump in, but I'd like to add my opinion. I have a few
>reasons why someone might use UV EPROMs.
>
> If you've got the right equipment, UV EPROMs are cheap, readily
>available, highly standardized, predictable, and generally pretty
>bulletproof.
Works for me. The larger Eproms like 27128, 27256 and larger
I have loads of from old PCs that were junked. A ready supply
of fast and large (often CMOS) eproms make it easier to do that.
Though I had to mod my Prommer to do parts larger than 27256
the code upgrade was easy.
Allison
>
> -Dave
>
>--
>Dave McGuire
>Port Charlotte, FL
>Farewell Ophelia, 9/22/1991 - 7/25/2007
>
>
> Marvin Johnston writes:
> Since I have a great deal of stuff to sell, I plan on bringing as much as I
> can with me :). It will be *wonderful* when I get the workbenches cleared off
> --------------------
>
> I thought you were making progress with the TRW and Livermore swap meets.
> That's a couple of loads a month!
Not enough progress!!! Most of the stuff I brought down last month was being
sold for other people. I'm getting ready to list a bunch of (appropriate) stuff
on VCM as well. The Zaca fire was close enough (about 10 - 15 miles) that I
wasn't comfortable going to Livermore last week. This weekend, I'm putting on an
ARDF practice here so I won't be going to DeAnza.
> Won't have much to sell. What is the VCF policy anyway? Can you do some
> dealing during the show? Or is it strictly show with the dealing outside or
> offline some where? If you can sell, what is the cost for a booth or table?
>
> Billy
The costs and policies will be posted on the VCF site once Sellam starts
publicizing VCF. AFAIK, it is no problem to make deals on or off the show floor
:). I'm also trying to get Dana Trout (Pickles & Trout) to come up. If he will
do that, it is possible that Sellam would put him on the list of speakers; he
has some fascinating stories to tell!
I have a SORD M243 Mark V system that came with PIPS, BASIC and SGL. This
Z80 system from 1982 seems to be interesting as it has a built-in color
monitor and graphics capabilities. But whenever I load SGL (Sord Graphics
Language) into memory I can't load anything other afterwards (like BASIC),
I get "memory exhausted".
The system has "only" 192 kB RAM and is expandable to up to over 700 kB. I
wouldn't mind building a memory expansion but I don't have the description
of the hardware, especially of the pseudo-S100 bus of this machine. Does
anyone have a hardware manual or the description of the I/O bus?
I'm also looking for other software like Fortran, MDOS distribution disks
or even CP/M (not sure if there was a CP/M for the M243).
Christian
>
>Subject: Re: newbie building a scratch-built computer
> From: "Chuck Guzis" <cclist at sydex.com>
> Date: Thu, 09 Aug 2007 09:37:12 -0700
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On 5 Aug 2007 at 17:21, Allison wrote:
>
>> Works for me. The larger Eproms like 27128, 27256 and larger
>> I have loads of from old PCs that were junked. A ready supply
>> of fast and large (often CMOS) eproms make it easier to do that.
>> Though I had to mod my Prommer to do parts larger than 27256
>> the code upgrade was easy.
>
>....but the OP had neither eraser nor programmer for the things--and
>that was my point. Why bother using slow, obsolete parts when there
>are better alternatives available?
Two reasons, cost and availability.
Allison
>
>Cheers,
>Chuck
>
> > *IF* you put on an event of your own and choose to call it the "Vintage
> > Computer Festival", *THEN* I will bury your event. Do what you like, but
> > find your own name.
>
> This is why I wouldn't call it VCF or have anything to do with the US
> VCFs in any case. The mere fact that someone has enough ego to go "It's
> *MY* name and if you use it I'll *crush* you, muahahahaha" puts me off
> any further involvement.
I don't know how many people feel as I do, but I would not attend a VCF that
Sellam was not a part of. He has put a great deal of time and money into
promoting this event, and for someone to feel they can dogtail onto his work
without his permission is just something I would not support.
And the feeling that the wheel needs to be reinvented when Sellam has made it
very clear he would support anyone wanting to put on a VCF, is beyond my
understanding.
And that said, how many people will be attending this years VCF at the Computer
History Museum in Mountain View? I have very much enjoyed being able to put
faces with names, and it is a great social event as well as being educational!
Since I have a great deal of stuff to sell, I plan on bringing as much as I can
with me :). It will be *wonderful* when I get the workbenches cleared off and I
have enough time and room to work with this stuff again.
Marvin Johnston writes:
And that said, how many people will be attending this years VCF at the
Computer
History Museum in Mountain View? I have very much enjoyed being able to put
faces with names, and it is a great social event as well as being
educational!
Since I have a great deal of stuff to sell, I plan on bringing as much as I
can
with me :). It will be *wonderful* when I get the workbenches cleared off
and I
have enough time and room to work with this stuff again.
--------------------
I thought you were making progress with the TRW and Livermore swap meets.
That's a couple of loads a month!
Yes, I will be at Mountain View. And have already lined up a couple of
people who want to see some of the old CDC machines I have. They are too
heavy for the VCF, but can have visitors out to the house.
Won't have much to sell. What is the VCF policy anyway? Can you do some
dealing during the show? Or is it strictly show with the dealing outside or
offline some where? If you can sell, what is the cost for a booth or table?
Billy
The Minimig:
http://home.hetnet.nl/~weeren001/minimig.html
I've read about this before but it all appears to be working now.
Impressive achievement, I feel.
--
Liam Proven ? Profile: http://www.linkedin.com/in/liamproven
Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com
Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419
AOL/AIM/iChat: liamproven at aol.com ? MSN/Messenger: lproven at hotmail.com
Yahoo: liamproven at yahoo.co.uk ? Skype: liamproven ? ICQ: 73187508
>
>Subject: Re: 8085 vs 8085A
> From: "Steven Canning" <cannings at earthlink.net>
> Date: Tue, 07 Aug 2007 01:11:07 -0700
> To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>
>
>> Hi,
>>
>> I was looking through my collection yesterday and was testing out an old
>> Intel SDK85 system. I noticed the main processor is stamped 8085, which
>> means this chip is either an 8085 or the "A" was not printed properly and
>> the chip is really an 8085A.
>>
>> I have a few 8085 systems and a box of 8085 CPUs. I checked them all and
>> every one of them is an 8085A. I don't think I have ever seen an 8085,
>> they've all been 8085A types.
>>
>> Other than the stamp on the chip, is there anyway I can tell the
>difference
>> between an 8085 and an 8085A? Furthermore, is the 8085 rare, and I should
>> put the chip away, or is it nothing special?
>>
>> Why did Intel bring out the 8085A? Were there issues with the 8085?
>>
>> Seeyuzz
>> River
>
>
>There were multiple versions of 8085 microprocessors. The original version
>of the 8085 microprocessor without suffix "A" was manufactured by Intel
>only, and was very quickly replaced with 8085A containing bug fixes. A few
>years after that, around 1980, Intel introduced 8085AH - HMOS version of
>8085A. There was also 80C85A - CMOS version of the 8085A. It's not clear if
>80C85 was ever manufactured by Intel or not, but it was produced by at least
It was. Supposededly the 8085 was used to proto the intel CMOS process
for the 80C48 and 80C188 and later parts.
>two second source manufacturers - OKI and Tundra Semiconductor. Tundra
>Semiconductor manufactured the fastest 8085 microprocessor running at 8 MHz.
I have a few 8mhz intel 8085AH-2s (16mhz clock crystal) HMOSII, those are
scarce but do exist. Intel did make the 8085AH (HMOSII) at 6mhz as well.
>Second source manufacturers: AMD, Mitsubishi, NEC, OKI, Siemens, Toshiba.
I have parts from all of them. I find the 8085 and Z80 to be good workhorse
8 bitters. Both enjoyed long sales lives.
Allison
>Best regards, Steven C.
>
>
>
>Subject: 8085 vs 8085A
> From: "river" <river at zip.com.au>
> Date: Mon, 06 Aug 2007 20:48:21 +1000
> To: <cctalk at classiccmp.org>
>
>Hi,
>
>I was looking through my collection yesterday and was testing out an old
>Intel SDK85 system. I noticed the main processor is stamped 8085, which
>means this chip is either an 8085 or the "A" was not printed properly and
>the chip is really an 8085A.
>
>I have a few 8085 systems and a box of 8085 CPUs. I checked them all and
>every one of them is an 8085A. I don't think I have ever seen an 8085,
>they've all been 8085A types.
>
>Other than the stamp on the chip, is there anyway I can tell the difference
>between an 8085 and an 8085A? Furthermore, is the 8085 rare, and I should
>put the chip away, or is it nothing special?
8085 (non A) is not rare but I have no data in my library for intel
to suggest any differnce between the non-A and the A part.
>Why did Intel bring out the 8085A? Were there issues with the 8085?
8085 was 1977 and the 8085A from what I have was soon before! Date
codes suggest late 1977 (week 52 1977) for one 8085A. I suspect
the differnces are processing only and they are interchangeable.
I should note that I only have a few intel 8085s in ceramic and
8085As in both ceramic and plastic. So there may be insignificant
process differnces. Also only the 8085A appears elsewhere (NEC, AMD)
so the upgrade may be a license issue.
Allison
>
>Seeyuzz
>River
>
