Hello to the group
Joe here are the exact model numbers that I have and do indeed work.
IOmega488a
IOtech Micro 488a
IOtech 488ex
IOtech serial 488a
Black Box 232 to 488a
If I would run across other units at $5 as I have in the past I would
indeed try the mod.
I think the key to the discussion is the MPU board needs to actually have a
eprom socket.
Regards
Paul.

On Sun, Mar 18, 2012 at 1:56 PM, paul swed <paulsw...@gmail.com> wrote:

> Joe
> Its been a while since I posted those eproms and info.
> I need to do 2 things. Look specifically at my models tested and listed
> and see what that means in the context of your question. Perhaps later
> today.
> Regards
> Paul.
> WB8TSL
>
>
> On Sun, Mar 18, 2012 at 11:38 AM, J. L. Trantham <jlt...@att.net> wrote:
>
>> Paul,
>>
>> Have you tried this in an NI GPIB-232CV-A or a GPIB-232CT-A?  I have tried
>> to swap the data between a 232CT-A and a 232CV-A with no joy.  The two
>> units
>> are fundamentally different.
>>
>> That's why I have the chips.
>>
>> Joe
>>
>> -----Original Message-----
>> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
>> Behalf Of paul swed
>> Sent: Sunday, March 18, 2012 9:38 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] IOTECH 488 EPROM
>>
>>
>> Hello to the group.
>> Indeed the prom changes the behavior to a full controller and the ones I
>> listed were changed and worked. Because those were the units I had found
>> over the years. No idea about this particular prom and such. Regards Paul
>> WB8TSL
>>
>> On Sun, Mar 18, 2012 at 10:12 AM, J. L. Trantham <jlt...@att.net> wrote:
>>
>> > 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-boun...@febo.com [mailto:time-nuts-boun...@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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