Author Topic: Password protection on an old EPROM  (Read 610 times)

Offline Den123

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Password protection on an old EPROM
« on: October 15, 2021, 08:52:39 AM »
Hi Older guys.
Remember the old 27C128 range of EPROMS? Has anyone heard of password protection on these devices?
I didn't think it was possible.

Offline DACMan1

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Re: Password protection on an old EPROM
« Reply #1 on: October 15, 2021, 11:22:06 AM »
I don't see that mentioned in any datasheets. How do you know it is password protected?

Offline Shonver

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Re: Password protection on an old EPROM
« Reply #2 on: October 15, 2021, 11:27:37 AM »
They only mention code protection, which is usually an option you configure when you blow the firmware. There should be more info on this in the application data book/doc, because there is nothing else in the data sheet.
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Offline Den123

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Re: Password protection on an old EPROM
« Reply #3 on: October 16, 2021, 09:56:27 AM »
My mate needs to copy one and his electronic chap says it is password protected.

Offline marantz123

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Re: Password protection on an old EPROM
« Reply #4 on: October 21, 2021, 10:41:33 PM »
Hi Older guys.
Remember the old 27C128 range of EPROMS? Has anyone heard of password protection on these devices?
I didn't think it was possible.

I repaired and programmed cash registers (Olivetti/Uniwell range) many moons ago and regularly wiped and reprogrammed eproms (the SGS Thomson 27C128s /256s) for these machines over a few years and recall the software program running on the terminal had a comprehensive menu.. Very possibly password protection was a feature on there. We never used it though. Get hold of any cash register repair business, their techs will advise if password protection is on there and if theres a way around it. These machines are still in use today, so you will have some luck. I think it may be a user-programmed password though. Try scratching around for some documentation from SGS Thomson, might just find something.
Keep that little glass window covered (with a label/sticker) Exposure to UV for long enough will erase the data on there if left uncovered.
« Last Edit: October 22, 2021, 09:38:06 AM by marantz123 »