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Questions tagged [eprom]

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19 views

Combining two schematics of 1kx3 NOR MOS PROM components into a 2kx6 PROM component

Today after class we were left with an exercise of creating schematics and combining two components we learned about today. The exercise is to combine two 1kx3 NOR MOS PROM components into a 2kx6 PROM ...
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0answers
51 views

old 80C31 circuit not working. EPROM data retention issue?

I have an old piece of pro-audio gear in for repair. It dates from 1990. It was a fairly high-end piece of gear at the time and still has some value so it is worth repairing. But the symptoms I see ...
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4answers
229 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 ...
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2answers
86 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 ...
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50 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 ...
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2answers
188 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 ...
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1answer
138 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
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1answer
87 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 ...
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1answer
98 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 ...