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SiriusHardware · 12th Sep 2017, 7:16 pm

Peter, what is the make / model number of your generator and what exactly is the fault history here?

Have you always (or at least for quite some time) owned this item and did it work OK originally?

Did this problem start off as small / occasional and progressively get worse, or was it working one day, and then straight on to relatively severe problems the next?

One possibility is that you are the victim of 'bit rot', which is the gradual fading away (over time) of the code stored in the firmware eprom.

If so, the only cure would be to obtain a copy of the original code from someone with a working unit and refresh the content of your eprom, or have someone program that code into the same kind of EPROM and swap it into your CPU board.

I'm guessing you don't have a general purpose EPROM programmer / reader, since you've already stated that you are more familiar with single chip microcontrollers such as PIC devices, and not so familiar with classic 'discrete' CPU systems like Z80, 6502, 6800 and so on.

12th Sep 2017, 7:16 pm	#9
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: Help with 6802 Microcontroller Peter, what is the make / model number of your generator and what exactly is the fault history here? Have you always (or at least for quite some time) owned this item and did it work OK originally? Did this problem start off as small / occasional and progressively get worse, or was it working one day, and then straight on to relatively severe problems the next? One possibility is that you are the victim of 'bit rot', which is the gradual fading away (over time) of the code stored in the firmware eprom. If so, the only cure would be to obtain a copy of the original code from someone with a working unit and refresh the content of your eprom, or have someone program that code into the same kind of EPROM and swap it into your CPU board. I'm guessing you don't have a general purpose EPROM programmer / reader, since you've already stated that you are more familiar with single chip microcontrollers such as PIC devices, and not so familiar with classic 'discrete' CPU systems like Z80, 6502, 6800 and so on.