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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.
-
-