On Sun, 2004-01-25 at 20:23, Fred Cisin wrote:
On Sun, 25 Jan 2004, Tom Jennings wrote:
> I AM NO EXPERT on this, but I'd like to point out that the meaning of
> "compatible" was far more slippery then than now. AFAIK the Phoenix BIOS
> was the first true compatible (eg. the number of incompatibilities was
> very, very small).
I agree that NOTHING was 100% compatible!
But, I don't understand what your point is,...
That 1982 claims of "compatible" are utterly different than the same
claim today or even 1992. I don't mean nit-picky microscopic differences
(a broad grey zone I admit :-) but will-it-run-95%-out-of-the-box-IBM PC
software. Few did in 84.
The usual video for the Compaq portables was CGA
(connected
with a mid-board connector to the internal B&W monitor)
IIRC, it responded pretty much identically to the IBM CGA,
in terms of INT10h, and to direct video writes to segment B800h.
In what ways was its video interface (except for the extra
internal connector) different?
Unfortunately I cannot think of a hard example, I was going by my
general recollection of incompatiblity in a number of areas, compaq vs.
IBM. It is possible that my recollection is faulty, but we were in the
compatibility business then so my incompatibility-recollections may be
amplified by that.
(It was also the beginning of the end of uPs for me; product development
is sooooo dull to me.)
Also, PSA's BIOS was *for sale*, allowing other manufacturers to get
into the game, so they were sideway-competing with Compaq (we visited
Compaq in TX some time in that period and saw some early laptop, I long
forget the details).
Seigmar Schmidt, a consultant who worked for PSA a lot, and whom I
worked with, did a lot of good work for PSA, and was all around a very
smart and pleasant person to work with. Random googles don't show as
much on him as her deserves.