[time-nuts] IOTECH 488 EPROM

[J. L. Trantham]

Joe,

The NI GPIB-232CV-A uses an ST M27C256B-15C1 One Time PROM in a PLCC 32 pin
package.  However, a Winbond W27E257 EEPROM is a pin for pin substitute.
The M27C256B and the W27E257 both come in a 28 pin DIP package (0.6 spacing)
so you should be able to use a programmer with that chip support and a DIP
to PLCC adapter, wired appropriately, to do the programming.  The 28 pin DIP
packages are UV erasable.  I've never seen a PLCC UV erasable package.  Do
they exist?

In any event, I can program the chip for you if needed.  I have some spare
W27E257P-10 chips and can burn one for you as well and send it to you if
needed.  I am in Northwest Florida.

Joe


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Joseph Gray
Sent: Sunday, March 18, 2012 2:18 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] IOTECH 488 EPROM

The text file accompanying the EPROM file on KO4BB's site mentions
using this EPROM image with a NI controller. I have a NI GPIB-232CV-A.
Can I use the image with this controller? If so, I assume that I then
have the equivalent of an IOTECH controller?

I partially disassembled my GPIB-232CV-A and from peering between the
boards, it looks like the EPROM is a PLCC. I can't burn one of those.
If I can use this image with my controller, can someone burn a chip
for me? I'll pay for the chip and shipping, of course.

Joe Gray
W5JG

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