Texas Instruments P-Card
The P-Card by Texas Instruments is an expansion card for the TI-99/4A
Peripheral Expansion System which gave the TI-99/4A the capability to use
and program software for the UCSD Pascal P-System. For those not familiar
with the P-System, it was an early attempt at platform-independent software
and all software written in accordance with it's specifications were to be
usable on any system, regardless of platform, which was using the P-System
software, and without modification. The P-System was available for quite
a few systems, including the TI-99/4A, IBM PC-XT, and Apple II. The P-Card
for the TI-99/4A actually took over the computer and early versions
required that you physically remove the card in order to use the TI in it's
normal modes. Later versions though added a switch to the rear of the card
that allowed you to turn it on and off without removing it from the system.
When switched on, the P-Card boots from it's onboard ROM and directly into
the P-System and it's menus.
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