Google sez:
Vmark was founded in 1984; Unidata in 1986. I did not find a date
for PI/Open.
If I remember correctly Vmark built the first releases of PI on
Unix for Prime.
Highly doubtful. Vmark was a direct competitor of Prime. The
original Prime Information was written by Devcom in Bellevue, Wa, in
the very late '70's. Substantial portions were written in PMA (Prime
macro-assembler). Most of the rest was written in Fortran or
Bootstrapped in Basic.
PI/Open was a fresh start, written by a collection of Brit's, in
large part, who did a good job of separating/abstracting the function
of the product from the OS that it was running on. They rewrote the
product from scratch in C.
Prime was parted out in 1988, and I think that may have been when
Vmark bought PI/Open.
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