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- │ Documentation for KACK v1.0 ██
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- ┌─────────────────
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- │ Quick start █
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-
- KACK is short for Key Accelerate & Click Key. It is a program
- which speeds up the typematic rate of the keyboard and/or gives
- a click each time pressing a key. Entering only `KACK' at the
- command line gives you this message:
-
- Usage: KACK /<C n Px U>
- /C for key Clicks
- /n (1..4) keyspeed
- /P x = tone period (100..10000)
- /U unload from memory
-
- Case of the argument is irrelevant. Some examples of usage:
-
- KACK /1 gives lowest repeat rate (about 7.5cps).
- KACK /4 gives fastest repeat rate (about 30cps).
- KACK /C /4 as above plus making clicks.
- KACK /C4p200 as above with higher tone
- KACK /U remove from memory if resident.
-
- The program goes resident if the click function (/C) is chosen.
- No click is heard when a key is released, neither when pressing
- a shift-key (Alt, Ctrl, LeftShift or RightShift). Changing type-
- matic rate is only possible on an AT or better. The PC/XT hasn't
- the 8042 keyboard processor which does this possible.
-
-
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- ┌─────────────────
- │ █
- │ Technical notes █
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-
- As a TSR, KACK will occupy only 160 bytes. This exceptional low
- memory usage is accomplished by using assembly language and by
- disposing most of the PSP. Most of this PSP area is of no use to
- this program. Many textbooks warns agains modifying values below
- 5Ch, but the word at 5Ch (DOS function dispatched) is a left-
- over from the CP/M days. I have found no program that rely on
- this value. Certainly not this program. (BTW, PkLite 1.14 puts
- the word 4B50h ('PK') at this location).
-
- If you wish to use a similar technique when making TSRs, be sure
- to leave the start of the PSP unchanged as this area is used for
- restoring interrupt vectors when exiting the program. Consult
- your technical literature for information on the PSP. The inter-
- rupt list edited by Ralf Brown is an indispensable tool. Look
- for INTER30?.ZIP or later on BBSes or at a shareware supplier.
-
- The program also releases its environment block when going TSR.
- Thus making the program invisible to memory mapping utilities
- like MapMem or Manifest when running MS-DOS prior to MS-DOS 5.
- To make the memory hole left by the environment block as small
- as possible, reduce your environment as much as possible. If
- installed in your AUTOEXEC.BAT place the call before your PATH
- or PROMPT statement. If your are using 4DOS, a simple trick is
- to put a `@' before `KACK'. This will reduce some environment
- space.
-
- To unload the program enter `KACK /u' at the DOS prompt. This
- frees the memory used (even if loaded high). If any TSR loaded
- after KACK grabs the keyboard interrupt, unloading becomes impos-
- sible. KACK will have no way of knowing the last owner of INT 9.
- This is the only interrupt KACK is hooking. If the memory block
- associated with KACK has become destroyed, execution halt with
- an error message. See the source code in KACK.8 for details.
-
- This program is released as FreeWare. Use the accompanied source
- code with caution. You are free to modify it as you pleases, but
- leave my name in as the originator of the code. The program has
- undergone tests on several PCs with MS-DOS 3.2, MS-DOS 5.0 and
- DR-DOS 6.0. No problems has been noted. If you have any problems
- using KACK, or find any errors or incompatabilities please drop
- me a message through one of the following channels:
-
-
- InterNet: giva@oscar.bbb.no
- Fido: 2:502/503
- PolarNet: GISLE VANEM @YRO (for Norwegians mostly)
- RIME conf: Software or shareware
- ILink conf: Shareware & Reviews
- Snail-Mail: Gisle Vanem, Breimyra 56
- 5091 Flaktveit, Bergen, NORWAY
- tel. +47-5-188249
-
-
- Enjoy!
-
-
-
- 9. July 1992
-