UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Non-working Commodore PET 3016

SiriusHardware · 8th Apr 2021, 10:37 pm

Colin may not know that the 28C16 is a more modern equivalent of the 2716 EPROMs he is currently running test code in. Programming a conventional EPROM requires a special mix of unusual voltages and programming algorithms, and to erase them so you can use them again you need to shine a particular wavelength of u-v light on them for about 20 minutes. In other words you need a specific programmer unit and an EPROM eraser unit.

The 28C16 can be programmed -and- erased using no more than 5V and something which can generate the right programming / erasing signals, such as an Arduino. Once you have that setup you can write bits of code yourself, and programme them into a 28C16 and drop it into the UD9 position (with the same adaptor you use for 2716s).

8th Apr 2021, 10:37 pm	#1458
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: Non-working Commodore PET 3016 Colin may not know that the 28C16 is a more modern equivalent of the 2716 EPROMs he is currently running test code in. Programming a conventional EPROM requires a special mix of unusual voltages and programming algorithms, and to erase them so you can use them again you need to shine a particular wavelength of u-v light on them for about 20 minutes. In other words you need a specific programmer unit and an EPROM eraser unit. The 28C16 can be programmed -and- erased using no more than 5V and something which can generate the right programming / erasing signals, such as an Arduino. Once you have that setup you can write bits of code yourself, and programme them into a 28C16 and drop it into the UD9 position (with the same adaptor you use for 2716s).