Wolfgang,
Philip Pemberton is right... it's not difficult, and for programming 2716,
2732 and 2532, it's even easier. The 4040 CMOS counter has exactly the
right number of outputs to handle all 12 address lines on a 2?32, and the
programming specifications for all those devices allow for a fixed-length
programming pulse, so the programmer can receive the byte, set BUSY on the
Centronics interface, time the 50ms locally, then clear BUSY to accept the
next byte... print your EPROM!
I know this well, because that's how I did it. I've used it with a
Sol-20, OSI Superboard 2, and IBM XT clone. If you would like the
schematics for my version (which assumes 2 unidirectional parallel
interfaces - one each direction - very common at the time), just let me know
and I will scan them (2 letter-size pages) into your preferred format and
e-mail them. The BASIC program I wrote is for the Superboard, so the
hardware stuff won't apply, but the program is reasonably structured... for
BASIC.
Best regards,
Bob Maxwell
> -----Original Message-----
> (snip...)
> There were many Eprom Programmers back when the 2532 etc.
> were actual which
> were designed for popular homecomputers (I own one for my
> Pet too and know
> of many for C=64). Many of these devices were "homebrewed
> gear" or sold as
> kits. But after lots of time googling around I haven't
> found much stuff
> about this old eproms. Okay, I have at least a bunch of
> datasheets and some
> schematics where ex. the 2532 were used and learned a lot
> of early 1980's
> hardware basics :) But I could not find some schematics
> (and software) of
> Eprom programmers dedicated to this chips. My (maybe dumb)
> question: Does
> anyone have some schematics and software (would be great)
> for a little
> homebrewed Eprom Programmer which works with a standard PC
> parallel-port or
> ISA slot? This would be a great project for rainy winter
> days :)
>
> Best Regards,
> Wolfgang
>From: Dan <cmonique(a)dodo.com.au>
>
>Chris,
>I was told that you have some documents on the Shure AMS8000 mixer.
>Is it possible for you to email me a copy of them?
>
>Kind regards
>
>Dan Allen
>
Hi
Doesn't anyone find it just a little suspicious that we got
two request for information for the same rare information? This
seems to be the typical type of request that we see. I realize
that it has been stated before that these may in fact be valid
request from someone looking at the archives. I just don't
believe it! I get the feeling that these are some kind of
automatic ( with some intelligence ) address mining bots.
Am I just paranoid or does anyone else see what I see.
Dwight
Holy moley! Speaking of word usage, I sure hope there's nobody from
Wales on this list.
-W
> Date: Tue, 27 Jul 2004 20:56:17 -0400
> From: "Joe R." <rigdonj(a)cfl.rr.com>
> Subject: Re: Cirris 1000
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk(a)classiccmp.org>
> Message-ID: <3.0.6.32.20040727205617.00b46680(a)pop-server.cfl.rr.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Jim,
>
> Yes I still have it. The winnng bidder welshed out and
> never paid for it. BTW note my address above. The address
> that you sent the message to is for a mailing list.
>
> Joe
>
besides the fact that it isn't possible to read sd disks with a controller that can only do dd..
so what does the diagnostic track read function of the 765 do (given that it is trying to read dd data)?
-----Original Message-----
From: Fred Cisin <cisin(a)xenosoft.com>
Sent: Jul 27, 2004 11:01 PM
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk(a)classiccmp.org>
Subject: Re: H89 disk imaging
On Tue, 27 Jul 2004, Dan Lanciani wrote:
> Did you ever get this going? I'm looking at a different approach, reading
> the single density disks a track at a time in double density and then doing
> the data separation in software.
A double density read with a PC FDC isn't going to work.
In fact, the NEC 765 type FDC (as is used in ALL of the PCs)
doesn't HAVE a track read; instead it has a "smart"
multi-sector read.
OTOH, if you use different hardware than a PC type FDC,
a track read of flux transitions can work.
Perusers of the American hobby publication "Nuts and Volts" are directed
to the August, 2004 edition (Vol 25; No 8) upon whose cover, and within
whose pages, can be found a lovely vacuum-tube preamp (off topic) by none
other than our own Robert Armstrong (on topic) of 'Spare-Time Gizmos' fame
- originator of the SBC 6120 PDP-8 emulator - and other similarly fabulous
devices.
www.sparetimegizmos.com
Good Show, Bob! Keep 'em Glowing!
Cheers
John 'Space Charge' Lawson
Did you ever get this going? I'm looking at a different approach, reading
the single density disks a track at a time in double density and then doing
the data separation in software.
Dan
Hi
If someone on the list replies to this ( or these ) fellows,
I'd like to know if they get any response. I've tried
to send to two of these types request in the past and
gotten no response. ( they didn't seem to care that
I had what they were requesting. )
In fact, I'd like to know if anyone that has sent to
one of these off list request has ever found that they
where actually talking to a real person.
I'll have to admit that this particular request looks
real. Still, from my past experience, I have my doubts.
The two request that I replied to in the past also seemed
as valid as this one.
As you will note, I have no problem responding to
those I recognize as being on the list or just responding
to the list in general. These off list request tend to
be about as close to form type request as the various
Nigerian scam letters I receive. They're all a little
different but all seem to have some common elements.
Dwight
>From: "Doc Shipley" <doc(a)mdrconsult.com>
>
>Dwight K. Elvey wrote:
>>>From: Dan <cmonique(a)dodo.com.au>
>>>
>>>Chris,
>>>I was told that you have some documents on the Shure AMS8000 mixer.
>>>Is it possible for you to email me a copy of them?
>>>
>>>Kind regards
>>>
>>>Dan Allen
>>>
>>
>>
>>
>> Hi
>> Doesn't anyone find it just a little suspicious that we got
>> two request for information for the same rare information? This
>> seems to be the typical type of request that we see. I realize
>> that it has been stated before that these may in fact be valid
>> request from someone looking at the archives. I just don't
>> believe it! I get the feeling that these are some kind of
>> automatic ( with some intelligence ) address mining bots.
>
> It's a little odd, but I have a very time believing that even an
>intelligent mining bot is going to turn out a request as detailed and
>coherent as the other request for Shure info. I'd come closer to
>believing that it's two techs at the same shop, or even the same guy
>posting from work and then from home.
>
>> Am I just paranoid or does anyone else see what I see.
>
> Not gonna go there, Dwight. :)
>
>
> Doc
>
Is anyone interested in IBM PS/2 models? I have a bunch of various models
available if anyone wants them for $10 each plus shipping:
Model 50
Model 50Z
Model 35 SX
...and some others. I'd rather they go to someone rather than be
scrapped, which is what's going to happen to them by the end of the week.
So make an offer if you're interested.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
>From: "Dan Lanciani" <ddl(a)danlan.com>
>
>Did you ever get this going? I'm looking at a different approach, reading
>the single density disks a track at a time in double density and then doing
>the data separation in software.
>
> Dan
>
Hi Dan
Unless you know something I don't about disk formats, you
can not read double single density format with a double
density controller. It isn't that you'll just get 16 bits
instead of 8 bits, things like sync makers will not work.
In any case, I currently have a method of transferring
hard sectored 40 track disk images to and from the following
platforms to a PC running DOS:
Z/H90 w/ serial card
H89 w/ serial card
H8 w/ H8-5 serial/cassette card
H8 w/ H8-4 serial card
( Note: The H8's may be either an 8080 w/ PAM8 or a Z80 w/ XCON8 ).
The DOS machine needs a serial port.
My setup can also be used to bootstrap a machine that one
has no access to disk with code on them. You only need the
blank disks to copy the images to to bring up a system.
Dwight
ps I hope Dan is on our mail list because I no longer email
directly to queries from off list. See my previous post.
