29 Mar
2007
29 Mar
'07
11:44 a.m.
-----------------Original Message:
Date: Thu, 29 Mar 2007 07:48:55 +1000
From: Doug Jackson <doug at stillhq.com>
Subject: Re: 2708 EPROM progreammer - old magazines designs
John S wrote:
I have a programmer designed by Steve Ciarcia from BYTE - It uses an
8051AH-Basic (The 8051 with basic embedded) as the controller - and
still works a treat - to this day. - Standalone board, interface via
serial. It was fun to see peoples faces when you shipped a ^C down the
serial line, and dropped through to a READY prompt.
I can find the doco for yo, but it is a high end solution to a simple
problem.
Alternately, I'm more than happy to read an eprom for you, and email
contents - I'm in Oz though. Perhaps there is somebody in the US who
could do the same.
Doug
-----------------Reply:
I have one of those as well; alas, it does NOT do 2708's.
To the OP:
I can scan the KB article for you, but the 2708 programmer is
intended to work with a Motorola MEK6800-D2, and consists of
nothing more than 3 transistors to switch the 27V (and a couple
of switches and a socket for the EPROM). It's all done in software.
mike
As 2708s are
obsolete few moern programmers support them, apart from a few
that cost many $100s. So I thought why not try and build one? I've found
references to the following classic magazines, and I would be willing to pay
a small fee for photocopies or scans of the articles:
Program your next EROM in BASIC. Schematic for a 2708 erasable read only
memory reader and programmer which uses parallel IO ports to set data and
address. The software to drive the programmer is written in BASIC.
Byte - March 1978 page 84 on (main article)
Byte - April 1978 page 62 (Byte Bugs)
23 Nov
23 Nov
9:50 a.m.
A simple reader for 2708's can be made with a 24 pin wirewrap socket
with legs that are at least 1 inch long. Bend out the -5 and +12 legs
and hook them up to small batteries (no real current draw) and then
simply read the device as a 2716 in ANY Eprom burner. Works for me! You
can replace 2708's with 2716s by simply bending (on the 2716) the two
pins that engage the -5 and +12 and jumpering them to pin 12 (ground) -
use the Eprom burner to copy the data from whichever half the data is
found in (most likely 0 - 3FFh)... I recommend that you program the data
in both halfs of the 2716 (0 - 3FFh and 400 - 4FFh) for redundancy.
John :-#)#
M H Stein wrote:
-----------------Original Message:
Date: Thu, 29 Mar 2007 07:48:55 +1000
From: Doug Jackson <doug at stillhq.com>
Subject: Re: 2708 EPROM progreammer - old magazines designs
John S wrote:
I have a programmer designed by Steve Ciarcia from BYTE - It uses an
8051AH-Basic (The 8051 with basic embedded) as the controller - and
still works a treat - to this day. - Standalone board, interface via
serial. It was fun to see peoples faces when you shipped a ^C down the
serial line, and dropped through to a READY prompt.
I can find the doco for yo, but it is a high end solution to a simple
problem.
Alternately, I'm more than happy to read an eprom for you, and email
contents - I'm in Oz though. Perhaps there is somebody in the US who
could do the same.
Doug
-----------------Reply:
I have one of those as well; alas, it does NOT do 2708's.
To the OP:
I can scan the KB article for you, but the 2708 programmer is
intended to work with a Motorola MEK6800-D2, and consists of
nothing more than 3 transistors to switch the 27V (and a couple
of switches and a socket for the EPROM). It's all done in software.
mike
--
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
www.flippers.com
"Old pinballers never die, they just flip out"
As 2708s
are obsolete few moern programmers support them, apart from a few
that cost many $100s. So I thought why not try and build one? I've found
references to the following classic magazines, and I would be willing to pay
a small fee for photocopies or scans of the articles:
Program your next EROM in BASIC. Schematic for a 2708 erasable read only
memory reader and programmer which uses parallel IO ports to set data and
address. The software to drive the programmer is written in BASIC.
Byte - March 1978 page 84 on (main article)
Byte - April 1978 page 62 (Byte Bugs)
26 Nov
26 Nov
11:10 a.m.
On Friday 23 November 2007 12:50, John Robertson wrote:
M H Stein wrote:
> I have a programmer designed by Steve Ciarcia from BYTE - It uses an
> 8051AH-Basic (The 8051 with basic embedded) as the controller - and
> still works a treat - to this day. - Standalone board, interface via
> serial. It was fun to see peoples faces when you shipped a ^C down the
> serial line, and dropped through to a READY prompt.
I have one of those too. And then you could type LIST and get a listing of
what was in there. But I never did make much sense out of what I saw then...
Since those days, I've collected a bit of info on that chip off the 'net,
though I haven't digested it yet.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
5:04 p.m.
On Nov 26, 2007, at 2:10 PM, Roy J. Tellason wrote:
I know that chip (both the 8052 and the BASIC interpreter that
shipped with that version of it) quite well. I've ported the BASIC to
more modern mcs51 implementations like the Philips 89C66x family, and
I've added functionality and fixed a few things. I've not released my
code but am considering it. The original code is unbelievably
tight...it FILLS the 8KB ROM space on the 8052, and gains density by
doing crazy stuff like jumping backward to access the RET instruction
> I have a
programmer designed by Steve Ciarcia from BYTE - It uses an
> 8051AH-Basic (The 8051 with basic embedded) as the controller - and
> still works a treat - to this day. - Standalone board, interface via
> serial. It was fun to see peoples faces when you shipped a ^C down
> the
> serial line, and dropped through to a READY prompt.
I have one of those too. And then you could type LIST and get a
listing of
what was in there. But I never did make much sense out of what I saw
then...
Since those days, I've collected a bit of info on that chip off the
'net,
though I haven't digested it yet. from a previous subroutine, etc. Not very readable,
but very, very
dense. Part of my effort was spent un-densifying it for clarity and
ease of maintenance. It's a very good BASIC interpreter in my opinion.
Before doing all that stuff, though, I spent a good bit of time
hacking with it burned into 8752 chips. The hex files and manual (as
PDF) used to be readily available online, but if anyone wants them, I
can provide them. I can also supply 8752 chips with the BASIC
interpreter burned into them for a nominal fee.
-Dave
--
Dave McGuire
Port Charlotte, FL
6235
days inactive
6478
days old
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