OT: 2708 Programer
Rich Beaudry
Sorry for the off-topic post, but I have another dumb question (well, maybe
a couple!):
Is there a commercial, still in production, EPROM programmer that will read
and write 2708 EPROMs? I realize with their mixed voltages (especially
+12V) that may be asking a lot, and it seems that all of the ones I can find
are 2716 and up...
If not, does anyone have schematics and software for a unit to read/write
2708s? I'm not afraid to build one, but again, even the kits I've seen on
the web seem to be 2716 and up...
Before anyone volunteers to read and/or write for me, I'd like to have my
own unit. I have many Multibus and S-100 cards that use 2708s, and I have
literally a stack of 2708s that I'd like to rescue before bitrot sets in.
Thanks for any pointers!!
Rich B.
Stewart and Leta Marshall
I think that there were schematics for three 2708 programmers,
including one which interfaced with a host computer, in Steve Ciarcia's
old book, Build Your Own Z80 Computer. If you can't find a copy, I have
it somewhere in my pile. Best Wishes for now,
Cheers, Stewart
cbfal...@my-deja.com
25 years ago I built a 2708 programmer. It got retired as soon as
2716s became available (and I had to build that programmer too). The
only thing worse is 1702's (and I made one of them).
I think you would be much better off building some sort of interface
to mount 2716s in 2708 sockets, even if you only use half the address
space. I assume the cards involved want to use them as ROMs. I
don't think the pin assignments changed that much from 2708 to 2716.
Thus a PC board with a socket and two header strips (to plug into
the original socket) and some traces should do it. The header
strips will probably eventually ruin the original sockets, because
they are wider than DIP pins, but you are going to plug things into
the new socket anyhow.
--
Chuck Falconer (cbfal...@my-deja.com)
http://www.qwikpages.com/backstreets/cbfalconer/
Sent via Deja.com http://www.deja.com/
Before you buy.
Steve
>
> Hello all,
>
> Sorry for the off-topic post, but I have another dumb question (well, maybe
> a couple!):
>
> Is there a commercial, still in production, EPROM programmer that will read
> and write 2708 EPROMs? I realize with their mixed voltages (especially
> +12V) that may be asking a lot, and it seems that all of the ones I can find
> are 2716 and up...
>
> If not, does anyone have schematics and software for a unit to read/write
> 2708s? I'm not afraid to build one, but again, even the kits I've seen on
> the web seem to be 2716 and up...
>
> Before anyone volunteers to read and/or write for me, I'd like to have my
> own unit. I have many Multibus and S-100 cards that use 2708s, and I have
> literally a stack of 2708s that I'd like to rescue before bitrot sets in.
>
>
> Rich B.
The closest to it is http://www.ZWS.com Epromr2 By Lewin A. R. W.
Edwards. You can change the pins of the socket and supply your own
voltages and if you set it for 2716 voltage and timing it should work!
-Steve
--
-Steve Walz rst...@armory.com ftp://ftp.armory.com/pub/user/rstevew
-Electronics Site!! 1000 Files/50 Dirs!! http://www.armory.com/~rstevew
Europe Naples, Italy: ftp://ftp.unina.it/pub/electronics/ftp.armory.com
Joe R.
the book but you have to step through each address manually and the
data is displayed on eight LEDs. However if you know much about
interfacing to a PC using the parallel port you shouldn't have too
much trouble connecting it to a PC.
Rich, I owe you for the books that you sent me so if you want this
one let me know and I'll send it to you.
Joe
Rich Beaudry
I greatly appreciate the offer, but believe it or not, I HAVE this book!!!!
Big DUH! on my part....
I had a complete mental breakdown, and thought the EPROM programmer
described in the book was for 2716s....
I checked, and sure enough, there is a 2708 reader/writer schematic. Three
of them actually, progressing from a simple manual model, to an automatic
one that connects to a host computer. Looks pretty easy to build, and looks
like cake to interface to a parallel port...
Thanks all, and sorry for the "senior moment" ... But I'm only 32! :-)
Rich B.
"Joe R." <rig...@intellistar.net> wrote in message
news:3a0964c4...@news.intellistar.net...
Steve
>
> Joe,
>
> I greatly appreciate the offer, but believe it or not, I HAVE this book!!!!
>
> Big DUH! on my part....
>
> I had a complete mental breakdown, and thought the EPROM programmer
> described in the book was for 2716s....
>
> I checked, and sure enough, there is a 2708 reader/writer schematic. Three
> of them actually, progressing from a simple manual model, to an automatic
> one that connects to a host computer. Looks pretty easy to build, and looks
> like cake to interface to a parallel port...
>
> Thanks all, and sorry for the "senior moment" ... But I'm only 32! :-)
>
> Rich B.
Hey, Rich, I have people ask me for a schem for a 2708 EPROM burner all
the time. If you have the capability I would love a scan of that book
project!! Just a raw scan and I can do the image processing, and I will
add a parallel interface to it.
Rich Beaudry
> the time. If you have the capability I would love a scan of that book
> project!! Just a raw scan and I can do the image processing, and I will
> add a parallel interface to it.
> -Steve
Steve,
I do not own a scanner (but it is tops on my list of things to get!)....
The best I could do is mail you a photocopy. Contact me off-list, and we
can work it out...
Rich B.
cbfal...@my-deja.com
> > Hello all,
> >
> > Sorry for the off-topic post, but I have another dumb question
> > (well, maybe a couple!):
> >
> > Is there a commercial, still in production, EPROM programmer that
> > will read and write 2708 EPROMs? I realize with their mixed
> > voltages (especially +12V) that may be asking a lot, and it seems
> > that all of the ones I can find are 2716 and up...
> >
> > If not, does anyone have schematics and software for a unit to
> > read/write 2708s? I'm not afraid to build one, but again, even
> > the kits I've seen on the web seem to be 2716 and up...
> >
> > Before anyone volunteers to read and/or write for me, I'd like to
> > have my own unit. I have many Multibus and S-100 cards that use
> > 2708s, and I have literally a stack of 2708s that I'd like to
> > rescue before bitrot sets in.
>
> 2716s became available (and I had to build that programmer too). The
> only thing worse is 1702's (and I made one of them).
>
> I think you would be much better off building some sort of interface
> to mount 2716s in 2708 sockets, even if you only use half the address
> space. I assume the cards involved want to use them as ROMs. I
> don't think the pin assignments changed that much from 2708 to 2716.
> Thus a PC board with a socket and two header strips (to plug into
> the original socket) and some traces should do it. The header
> strips will probably eventually ruin the original sockets, because
> they are wider than DIP pins, but you are going to plug things into
> the new socket anyhow.
I recently ran into the following - it claims to handle 2708s.& 1702s
http://www.elnec.com/lprog_uk.htm
http://www.elnec.com
Rich Beaudry
>
> http://www.elnec.com/lprog_uk.htm
> http://www.elnec.com
>
> --
> Chuck Falconer (cbfal...@my-deja.com)
Sorta cool, but still needs additional modules to do 1702s and 2708s. Also,
no US distributor is listed....
I guess Steve Ciarcia wins! :-)
Rich B.
Stewart and Leta Marshall
cheaper ZIF sockets into the original socket on your board (assuming you
have enough space between boards for the extra height, or can move the
board to a less crowded end of the backplane. Jameco, for example, has
an Aries 24 pin ZIF for just $6.95, their number 103991. Jumper traces
could live beneath the ZIF if needed and then changing eproms for
various experiments is a cakewalk. After the experimenting phase, the
ZIF is always useful somewhere else because it hasn't been soldered or
otherwise altered.
Cheers, Stewart
dwight_...@my-deja.com
>
> Rich B.
>
>
Hi Rich
Watch eBay and such for a thing called a 8K Byte Saver.
It is a S-100 board that will work as a PROM board or
one can program 2708's as well. I have one of these
that I use to deal with these old EPROMs. I transfer
the data from my CP/M box over the serial to my PC.
For 1702's I have a 4004 developement system that
programs them. I had to write a program to translate
standard formats to BPNF tape format, for it.
Dwight
Barry Watzman
and write 2708's. They are fairly plentiful, and appear every few months on
E-Bay. There has been one on E-Bay within the last couple of weeks.
There were 3 bytesavers: The original one, the Bytesaver II and the 2716
bytesaver. The first two both did 2708's, the II model had bank select. The
2716 Bytesaver did ONE TYPE of 2716's, but not all types of them.
Rich Beaudry wrote:
> Hello all,
>
> Sorry for the off-topic post, but I have another dumb question (well, maybe
> a couple!):
>
> Is there a commercial, still in production, EPROM programmer that will read
> and write 2708 EPROMs? I realize with their mixed voltages (especially
> +12V) that may be asking a lot, and it seems that all of the ones I can find
> are 2716 and up...
>
> If not, does anyone have schematics and software for a unit to read/write
> 2708s? I'm not afraid to build one, but again, even the kits I've seen on
> the web seem to be 2716 and up...
>
> Before anyone volunteers to read and/or write for me, I'd like to have my
> own unit. I have many Multibus and S-100 cards that use 2708s, and I have
> literally a stack of 2708s that I'd like to rescue before bitrot sets in.
>
Richard Erlacher
voltages. The 2716's are pretty common and MUCH easier to program.
If you need to build your own programmer, keep in mind that there are
numerous ways to get the cat skinned, but the place to start is with
the Intel spec for the device. Once you've got that, the EPP parallel
port on your PC will provide the signals to effect programming, and,
once you've built the programmer, it can handle your other needs as
well, and all from a piece of 'C' code you've crafted yourself, and,
hence, canadapt and modify all you want.
Dick
Charles Richmond
>
> Hello all,
>
> Sorry for the off-topic post, but I have another dumb question (well, maybe
> a couple!):
>
> Is there a commercial, still in production, EPROM programmer that will read
> and write 2708 EPROMs? I realize with their mixed voltages (especially
> +12V) that may be asking a lot, and it seems that all of the ones I can find
> are 2716 and up...
>
> If not, does anyone have schematics and software for a unit to read/write
> 2708s? I'm not afraid to build one, but again, even the kits I've seen on
> the web seem to be 2716 and up...
>
> Before anyone volunteers to read and/or write for me, I'd like to have my
> own unit. I have many Multibus and S-100 cards that use 2708s, and I have
> literally a stack of 2708s that I'd like to rescue before bitrot sets in.
>
covers how to build a 2708 programmer for the S-100:
"2708 EPROM for the S-100", by Bill Walters, Kilobaud, Issue 33, September,
1979, pages 78 through 82
If you have trouble finding this article, email me and I'll see about getting
the information to you...
--
+-------------------------------------------------------------+
| Charles and Francis Richmond <rich...@plano.net> |
+-------------------------------------------------------------+
Steve
>
> Hello all,
>
> Sorry for the off-topic post, but I have another dumb question (well, maybe
> a couple!):
>
> Is there a commercial, still in production, EPROM programmer that will read
> and write 2708 EPROMs?
ANY programmer should be able to READ them if you supply all the
voltages that old EPROM needs, and route the pins where they have to go,
then that solves the problem of "bit-rot". It is far simpler, however,
to write them to newer EPROMs in cross-over sockets which will last far
longer and be far more easy to have reproduced.
> I realize with their mixed voltages (especially
> +12V) that may be asking a lot, and it seems that all of the ones I can find
> are 2716 and up...
>
> If not, does anyone have schematics and software for a unit to read/write
> 2708s? I'm not afraid to build one, but again, even the kits I've seen on
> the web seem to be 2716 and up...
>
> Before anyone volunteers to read and/or write for me, I'd like to have my
> own unit. I have many Multibus and S-100 cards that use 2708s, and I have
> literally a stack of 2708s that I'd like to rescue before bitrot sets in.
>
> Thanks for any pointers!!
>
> Rich B.
--------------------
I would need the specs on the 2708, even MY Intel manuals don't go back
before 1981, but if I have them I can tell you how to make an adapter to
read them and probably write them with a trivial add-on for any EPROM
programmer. Anybody got that old datasheet chapter in PDF form???
Lee Hart
> read and write 2708 EPROMs?
Which reminds me. I have several tubes of Texas Instruments TMS2716
EPROMs (2kx8, but requires 3 supply voltages). I have no programmer for
them, either. If anyone has a use for these parts and would like them,
please contact me directly.
--
Lee A. Hart Ring the bells that still can ring
814 8th Ave. N. Forget your perfect offering
Sartell, MN 56377 USA There is a crack in everything
leeahart_at_earthlink.net That's how the light gets in - Leonard Cohen
Bill Dawson
"Steve" <rst...@armory.com> wrote in message
news:3A0C89...@armory.com...
> --------------------
> I would need the specs on the 2708, even MY Intel manuals don't go back
> before 1981, but if I have them I can tell you how to make an adapter to
> read them and probably write them with a trivial add-on for any EPROM
> programmer. Anybody got that old datasheet chapter in PDF form???
> -Steve
Complements of FreeTradeZone:
http://www.swtpc.com/chips/1702/intel_1702a.pdf
http://www.swtpc.com/chips/2708/2708.pdf
Regards,
Bill