[Coco] PAL Coco 1/2 schematics/timings

[Torsten Dittel]

Bruce W. Calkins schrieb:
> No, the "F" or 283 board was the last version of the CoCo 1 and had a 
> lower limit of 16k, with hardware provisions for 64k accessable with 
> OS-9.  4k would have been a "D" or earlier board.  The "E" board had no 
> provisions for 4k, but required added wireing for 64k.  Few "C" or 
> earlier boards were released for sale, so data on them is limited.

Ah - thanks for freshing my mind up. I remember that expanding the 4K 
machine to 64K required some minor modifications. I further remember, 
Tandy had done an upgrade to 16KB Extended BASIC before on that 
particular machine...