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speedkey.doc
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1995-06-16
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N O T E S O N S P E E D K E Y
by John B. Zuckerman
1. To use SPEEDKEY, simply type "SPEEDKEY" at the DOS prompt. The
program then loads, initializes, and returns to DOS. You may now
run any other DOS program (except BASIC, see below). SPEEDKEY is
completely invisible to other programs.
2. I have attempted to keep the operation of the keyboard exactly the
same except for the speedup. Without SPEEDKEY, the keyboard
produces some bizarre effects at times (especially when the BIOS
keyboard becomes full). These effects are also present with
SPEEDKEY.
3. The interrupt handlers do something that from a programming
standards perspective is blatantly illegal. They actually jump
into the middle of a ROM BIOS routine rather than enter the
routine via the conventional method (using the INT instruction).
Because this is in violation of the established programming
standards, I have included extra code in the initialization part
of the program to verify that the version of BIOS encountered is
one of the recognized versions (there are four of these, in
total).
4. I have tested the program on both PC's and XT's, with DOS 1.1 and
2.0, and with a variety of software. The only program that I have
found so far that will not work properly with SPEEDKEY is BASIC
(and BASICA). Actually, BASIC runs fine, but the repeat function
is defeated. Curiously, when you exit BASIC (with SPEEDKEY
installed), the repeat function is reinstated!
5. Should you find a bug or error caused by this program, I would be
grateful if you would report it to me.