Re: [volt-nuts] EPROM Programmer

[Todd Micallef]

Randy,

I use the GQ-4X from mcumall.com. It works great and I have had no problems
with it. I have bought a few adapters to support PLCC and SOIC packages.

For the NVRAM, don't overlook the STMicroelectronics memory. I have used
the M48Z12 as a direct replacement.with no issues. The only thing I didn't
like was the date code format on the part. They only list the last digit of
the year and week. I guess if you replace it every 10 years it is not an
issue.

Todd.

On Tue, Nov 7, 2017 at 10:08 PM, Randy Evans 
wrote:

> Can someone recommend a good low-cost method to program the DS1220 and
> DS1230 NVRAMs for the HP-3458A?  I downloaded the CAL contents and I need
> to program new NVRAM chips to replace the older (very old) NVRAMs still in
> the unit.
>
> Also, will the DS1220AD and DS1230AD chips work in place of the
> existing DS1220Y
> and DS1230Y NVRAMs in the HP-3458A?  The AD versions have different timing
> "power good" specifications and they don't work as a plug-in substitute in
> all cases.  I assume some 3458A users have changed out the NVRAMs with the
> new Dallas parts ( Dallas no longer makes the DS1230Y NVRAM, but does still
> make the DS1230Y NVRAM, according to their data sheet).
>
> Thanks,
>
> Randy Evans
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[volt-nuts] EPROM Programmer

[Randy Evans]

Can someone recommend a good low-cost method to program the DS1220 and
DS1230 NVRAMs for the HP-3458A?  I downloaded the CAL contents and I need
to program new NVRAM chips to replace the older (very old) NVRAMs still in
the unit.

Also, will the DS1220AD and DS1230AD chips work in place of the
existing DS1220Y
and DS1230Y NVRAMs in the HP-3458A?  The AD versions have different timing
"power good" specifications and they don't work as a plug-in substitute in
all cases.  I assume some 3458A users have changed out the NVRAMs with the
new Dallas parts ( Dallas no longer makes the DS1230Y NVRAM, but does still
make the DS1230Y NVRAM, according to their data sheet).

Thanks,

Randy Evans
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