[time-nuts] IOTECH 488 EPROM

Joseph Gray jgray at zianet.com
Mon Mar 19 23:33:10 UTC 2012


Paul,

Thanks for that info. I'll keep an eye out for those models (cheap). I
guess my NI unit is too different to use that EPROM.

Joe Gray
W5JG

On Mon, Mar 19, 2012 at 12:42 PM, paul swed <paulswedb at gmail.com> wrote:
> 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 <paulswedb at 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 <jltran at 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-bounces at febo.com [mailto:time-nuts-bounces at 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 <jltran at 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-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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>>
>>
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