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 M27C Series EPROMs Device Programming Fix
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Posted - 11/29/2015 :  21:20:02  Show Profile  Reply with Quote
I just wanted to post some more corrections I made to the devices.txt file. Specifically for the 27C series of EPROMs.

I discovered this because I had a few EPROMs that didn't program properly with the voltages outside of the manufacturers specified range.

First off the generic devices (27C64, 27C128, etc) without a manufacturer specified:

The 27C256 had the wrong VPP 12 volts instead of 12.7. The specs in every datasheet I've read specify 12.7 volts +- 0.25 volts 12 volts is way out of tolerance. It also had the wrong WVCC 5.5 volts instead of the standard 6.2 volts.

The other generic devices simply had the wrong WVCC 5.5 volts instead of 6.2 volts which I corrected.

Generic 27C Corrections:


Now onto the NM27C and NMC27C series of EPROMs these are 27C series EPROMs made by National Semiconductor.

All of these had the wrong VPP according to the manufacturers datasheet 12 volts instead of 12.7 and the wrong WVPP 5.5 volts instead of 6.2 volts which I corrected.

National Semiconductor NM27C and NMC27C Corrections:

Name="NMC27C256B",ID="8F04",Class="27C256",Category="EPROM",MFG="National",VCC="5V",WVPP="12.7V",WVCC="6.2V",BVCC="5V",RVPP="5V";//by EZo

Name="NMC27C512A",ID="8F85",Class="27C512",Category="EPROM",MFG="National",VCC="5V",WVPP="12.7V",WVCC="6.2V",BVCC="5V",RVPP="5V";//by EZo

Edited by - Krankshaft on 12/03/2015 00:44:29
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2939 Posts

Posted - 12/03/2015 :  22:08:36  Show Profile  Reply with Quote
Thank you for all.
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