Electronics > Microcontrollers

UVPROM

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Peabody:
I remember the UV parts as being pretty tolerant of abuse like that.  Perhaps you should at least try them to see if they will program.

veedub565:
Yeah the older stuff like that is more tolerant then the more modern stuff. I will give them a try, It's not ideal though, and a little frustrating. Such is the vagaries of EBAY I suppose.

m k:
It's very irritating when people are dealing with these things seemingly without any idea of ESD.
Legendary is a situation where seller has opened the package and placed components on what ever surface, beside the package.

One other thing, I don't understand this ROM access time uncertainty, it's just a memory.
Maybe it's an understanding of not available, it's not complete, something is always available.

If you upgrade a computer memory you're checking how fast replacement is still accessed faster.

Last time I bought 256k 28-series EEPROMs.
They are also drop in replacements for 64k and 128k of 27-series.
Of course for non authentic cases only.

veedub565:
Well I got around to erasing these chips, 1hr with a Stag prom eraser. My friend was going to program them for me, but it turns out his Dataman 48UXP doesn't list that device. I think he said he'd have to spend £150 to get a license or something, not worth it.

Any suggestions ?

Dataman 48Pro2 does list that device, but really expensive to buy.

I'm looking to see if there are any businesses nearby that would program them for me.

Or I could use one of the other IC's previously mentioned, and maybe a cheaper prommer would work.

PCB.Wiz:

--- Quote from: veedub565 on June 16, 2023, 04:45:03 pm ---Well I got around to erasing these chips, 1hr with a Stag prom eraser. My friend was going to program them for me, but it turns out his Dataman 48UXP doesn't list that device. I think he said he'd have to spend £150 to get a license or something, not worth it.

--- End quote ---

My EEtools programmer says this about those chips
Manufacturer:AMD, Device name:Am27256
Package Info.:DIP28, Organization:8000h x 8 bit, Adapter name:None, Manufacturer ID.:0001, Device ID.:0004, Algorithm:Quick, Vcc pin(s):28, Gnd pin(s):14, Vpp pin:1, Vccp:6.25V, Vpp:12.75V, Tpwp:100us


So you may be able to select a same-algorithm device ?

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