[Coco] S-video Prospects...
zmerch at 30below.com
Sat Dec 17 14:15:36 EST 2005
So, according to my CoCo3 Service manual, the PAL CoCo3 motherboard does
seem to be different than the NTSC CoCo3... but if one were to acquire a
PAL board & change the crystals, (a la Sockmaster) one could generate S-Video.
Also, according to the manual, the GIME chip in the NTSC & PAL CoCo3s are
the exact same chip; so saying that chroma & luma are generated totally
internally on the NTSC CoCo3, whilst true, seems to be also true of the PAL
CoCo3 as well...
So if the PAL board is generating chroma & luma from RGB, and if one could
find a source of PAL boards but with NTSC crystals, anyone in the US could
have S-Video on their CoCo3, right?
That said, my service manual has the complete parts lists (right down to
the capacitors & resistors) and a PCB layout of both sides of the PAL
daughterboard. If all of the 3 chips are commercially available, other than
the actual building of the board, one _might_ be able to come up with a
source of PAL boards without having to destroy PAL CoCo3's in the
How much trouble would a person be in if he or she were able to...
"replicate" the PAL board? [[ Admittedly, it's not like said person would
be costing Tandy any lost profits... ]]
Just some random thoughts for a non-random Saturday...
Roger "Merch" Merchberger
Roger "Merch" Merchberger | "Profile, don't speculate."
SysAdmin, Iceberg Computers | Daniel J. Bernstein
zmerch at 30below.com |
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