5 Mar
2012
5 Mar
'12
8:53 p.m.
Can anyone point me to a reasonably priced programmer for the 8755?
Lots of programmers but none seem to program this chip.
The one I have found is pretty expensive, as in out of my range ( a
couple of Elnec at $1k and more).
Was the 8755 that different?
Thanks in advance,
Kelly
5 Mar
5 Mar
9:36 p.m.
Hi
Is it a 8755 or a 8755A.
They program differently.
Someplace in one of the Intel books there
is programming instructions.
It didn't program like a 2716 if that is what
your asking.
Still one could wire wrap something that would
work, using the printer port of a PC.
Dwight
Date: Mon, 5 Mar 2012 22:53:15 -0600
Subject: programmer for 8755
From: kfergason at gmail.com
To: cctalk at classiccmp.org
Can anyone point me to a reasonably priced programmer for the 8755?
Lots of programmers but none seem to program this chip.
The one I have found is pretty expensive, as in out of my range ( a
couple of Elnec at $1k and more).
Was the 8755 that different?
Thanks in advance,
Kelly
9:55 p.m.
New subject: Johnson Motor
Hi
I'm using hot mail and I just saw an advertisement
for a book that tells one how to make what is called
a Johnson Motor ( one of the perpetual scams of
a few years back ).
I guess hotmail is willing to take ads from anyone
that is willing to pay for it.
As PT Barnum was said to have said.
"It is a crime to let a sucker leave with money
still in his pocket" ( or at least something like that ).
The book sells for $45. I bet there is at least 1000 people
that buy one.
Dwight
10:31 p.m.
New subject: Johnson Motor
On Mon, 5 Mar 2012, dwight elvey wrote:
I'm using hot mail and I just saw an advertisement
for a book that tells
one how to make what is called a Johnson Motor ( one of the perpetual
scams of a few years back ). I guess hotmail is willing to take ads from
anyone that is willing to pay for it. As PT Barnum was said to have
said. "It is a crime to let a sucker leave with money still in his
pocket" ( or at least something like that ). The book sells for $45. I
bet there is at least 1000 people that buy one. Dwight
There seems to be a lot of stuff going by the name of "Johnson Motor".
The first hit on Google is a company that manufactures perfectly ordinary
electric motors.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
6 Mar
6 Mar
2:12 p.m.
If you spend a bit of time with a data sheet you would find that the 8755
programs much like the 2716 and in many cases (dataIO) it was a
trivial adapter.
Programming is simple:
For each address DO;
Present address to AD0-7 and A8-10 and cycle ALE (low, high, low):
Present data of AD0-7:
Pull prog/CE1* to 5V (NMOS high):
pulse Vdd from 5V to 25V and back to 5V, the width of this pulse
is 50mS:
Remove data:
Until done
My first programmer for that part litterally was 10 switches (address/data),
and ALE pulse button (debounced buton) and a program button
(fired the Vdd and program pulse). The circuits were pretty trivial.
I would later modify a PrommerII to do that.
Allison
On 03/06/2012 12:36 AM, dwight elvey wrote:
Hi
Is it a 8755 or a 8755A.
They program differently.
Someplace in one of the Intel books there
is programming instructions.
It didn't program like a 2716 if that is what
your asking.
Still one could wire wrap something that would
work, using the printer port of a PC.
Dwight
Date: Mon, 5 Mar 2012 22:53:15 -0600
Subject: programmer for 8755
From: kfergason at gmail.com
To: cctalk at classiccmp.org
Can anyone point me to a reasonably priced programmer for the 8755?
Lots of programmers but none seem to program this chip.
The one I have found is pretty expensive, as in out of my range ( a
couple of Elnec at $1k and more).
Was the 8755 that different?
Thanks in advance,
Kelly
5 Mar
5 Mar
9:37 p.m.
On 03/05/2012 11:53 PM, Kelly Fergason wrote:
Can anyone point me to a reasonably priced programmer
for the 8755?
Lots of programmers but none seem to program this chip.
The one I have found is pretty expensive, as in out of my range ( a
couple of Elnec at $1k and more).
If you run out of options for getting a programmer of your own and
are in a pinch, I'm happy to burn 8755s for you here.
Was the 8755 that different?
It was not my impression that it was, no.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
4680
days inactive
4680
days old
5 comments
5 participants
participants (5)
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ajp166＠verizon.net -
dgriffi＠cs.csubak.edu -
dkelvey＠hotmail.com -
kfergason＠gmail.com -
mcguire＠neurotica.com