Malfunctioning VT240 - help please

Charles charlesmorris800 at
Mon Jun 15 20:13:16 CDT 2020

Make that "fuse-link PROMs". My mistake.


On 6/15/20 10:41 AM, Tony Duell wrote:
>> My fear is that one of the PALs has altered itself from tin-whisker
>> migration (fuse regrowth) :(
> I've finally looked at the printset for the VT240 and I must be
> missing something....
> The only PALs I can find are the 'logic units' in the  video memory
> updating circuitry. That circuitry is pretty much the same as .... the
> Rainbow colour graphics board and I suspect the PAL logic is much the
> same too. I have the Rainbow's PAL equations if you need them but I
> doubt that's the problem.
> -tony

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