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Questions tagged [eprom]

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3
votes
4answers
181 views

Can an EPROM be “refreshed” without UV erasing?

I have lots of AM27C512 65k x 8b EPROMS (with the UV window) which are quite old (1980's.) Using a Xeltek SuperPro 3000U, most can still be read and verified. A few have failed outright and were ...
1
vote
2answers
81 views

EPROM memory - the theoretical possibility of recovering data from memory after erasing the exposure with ultraviolet light?

I have a small question. We have a EPROM memory. Is there a theoretical possibility of recovering data from memory after deleting with ultraviolet light? Is this theoretically possible? Or maybe it ...
0
votes
0answers
48 views

EPROM M27C801 Writing to address

I am having trouble time writing the EPROM chip, like the datasheet told me to have 12-13v connect to VPP while GVpp is on high, I add 8 more volts with button so 4.5 plus 8v is 12.5-13v(8-9v battery ...
2
votes
2answers
178 views

Switch between power and signal with MCU

I am trying to make a basic EPROM programmer using an Arduino. It is designed to programme M27c322/160/800 devices. One problem I am encountering is that these 3 devices have a couple of the pins ...
0
votes
1answer
116 views

EPROM programmer voltage/signal switch

I am trying to make a basic EPROM programmer for M27C322/160/800 chips, mainly as an learning exercise since I know I can buy adaptors for programmers I already own. I found a very useful resource in ...
5
votes
1answer
76 views

Is it safe to reconnect a presumably broken PROM connector pin?

I am trying to understand (and fix) a soda machine that doesn't seem to accept 1€ and 2€ coins while all stickers (inside and outside) seem to imply that they should work (5ct to 50ct do work). I ...
2
votes
1answer
89 views

How to replace TTL PROMs in a design operating at 20MHz

I am attempting to come up with a reasonable way of implementing a design that was intended for cheap computer applications in the 1980s and which was originally designed to use a pair of TTL PROMs (a ...