22 Oct
2004
22 Oct
'04
9:09 a.m.
Hi
I guess the next thing is to find a pinout for
the 23512 to see if they have a select that is inverted
that might need to be patched around to read on
a standard programmer.
Dwight
From: birs23(a)zeelandnet.nl
Dwight, not missing the discussion ;-)
At 19:15 22-10-2004, you wrote:
From:
ard(a)p850ug1.demon.co.uk
>
> Hi,
>
> I know very little about electronics and eproms so this question might be
> really easy. I would like to know what the difference is between a 23512
> eprom and a 27512 and if there are any differences if its possible to
make
I thought the 23512 was the mask-programmed part (not an EPROM), and is
otherwise the same device. You should be able to read it (unless your
programmer tries to be clever and read the manufacturer's ID word, etc).
-tony
Hi Tony
I think you are right about the 23xxx being mask versions.
The problem with the newer EPROM parts is that they do not
require pulsing of the programming voltage. Many programmers
simply leave the programming voltage high while reading or
verifying. This is real bad for mask parts. Also, most mask
parts use the programming voltage pin as another select.
This means that it may need to be in the opposite state that,
even a programmer that allows setting of the program voltage,
may not be in the right state to read.
Also, I think this fellow is off the list and doesn't realize
that he is talking to a list. I suspect he is missing our
conversations related to his issue.
Dwight