Electronics > Microcontrollers
UVPROM
veedub565:
Hope this is the right part of the forum for this. I have a HP 8341B Signal Generator with four UVPROM's containing the firmware on the processor board. The firmware is an old version and I want to update it. I want to retain the old UVPROM's so I still have a good copy of the old firmware.
The UVPROMS's are AMD AM27256-1DC and long since obsolete now.
Couple of questions,
1. Is there a suitable modern alternative ?
2. Is it worth buying used UVPROM's ?
Andy Watson:
I've purchased a few batches of EPROMS from ebay without any problems. All of them used. Note, you'll probably want a UV eraser to make sure that theyr're blank.
Alternatively, take a copy of the erpoms that you have and then re-program them.
veedub565:
Thanks Andy, got a Stag prom eraser available to me to wipe them with.
Peabody:
They appear to still be available. Jameco has a few hundred in stock, which I assume are new.
But I wonder if an AT28C256 EEPROM would work. But the old UV version may be cheaper and easier to find.
srb1954:
--- Quote from: veedub565 on May 10, 2023, 04:56:25 pm ---Hope this is the right part of the forum for this. I have a HP 8341B Signal Generator with four UVPROM's containing the firmware on the processor board. The firmware is an old version and I want to update it. I want to retain the old UVPROM's so I still have a good copy of the old firmware.
The UVPROMS's are AMD AM27256-1DC and long since obsolete now.
Couple of questions,
1. Is there a suitable modern alternative ?
2. Is it worth buying used UVPROM's ?
--- End quote ---
If you are doing a simple S/W update and don't need to repeatedly erase and reprogram parts you should also consider OTP (one-time-programmable) parts e.g. Microchip AT27C256R-70PU. These are still available new from reputable distributors and are somewhat cheaper as they are packaged in a standard plastic DIP package rather than the expensive windowed ceramic package.
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