The Tandy 1000 series WAS a clone of the PC Jr, why would you expect 100%
5150 compatibility? Tandy didn't have DMA unless you got the special RAM
upgrades, and they made sure to have all the ports different to sell you
Tandy cables (special joystick ports, serial ports of the wrong gender,
special printer ports, even the floppy drives were different then anything
I thought the Tandy 1000s were designed to use existing _Tandy_ cables
and joysticks. That is, the joysticks were the smae as for the CoCo, the
printer port was a 34 pin card edge (so as to use M1/3/4 cables) and so
on.
on a clone because the power was in the data cable).
The very last 1000's
ended up with VGA I think. Nobody with a clue would have purchased these
new.
Tandy and Amstrad machines had one accessory available that AFAIK was not
avaialbe for other clones (it was avaialbe for IB< 5150/5160/5170
machines). This accessory is rather important to me. I refer, of course,
to a schematic diagram.
-tony