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Re: New (to me) 7854 scope

 

The original mask ROMs (Mostek? Motorola?) have poor long term reliability and
not just in the 7854. Assuming you can find some 2364 pinout EPROMs, the
easiest option is to copy the ROMs to them or burn directly from the available
firmware images.

Originally I planned on using a couple of 2364 pinout to 2764 pinout converters
and 2764 or 27C64 EPROMs but my 7854 is a later version which does not use the
2364 style parts.

On Sat, 18 Jan 2014 15:54:01 -0800 (PST), you wrote:

Howdy,

? ?I saw the posts on this topic earlier this past week and they didn't register in my head. ?But how concerned should I be about this "ROM rot"? ?What is the cause? ?What is the cure? ?I have an old-school PROM burner. ?Can I just copy the chips?

? Do we have some statistics on how frequently it occurs? ?Chip date code ranges for bad chips, etc...?

? Dan
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