15 Jun
2020
15 Jun
'20
6:13 p.m.
Make that "fuse-link PROMs". My mistake.
-Charles
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