Dec 132017
TCHK Turbo C library. Contains HUNDREDS of useful function.
File TCHK21.ZIP from The Programmer’s Corner in
Category C Source Code
TCHK Turbo C library. Contains HUNDREDS of useful function.
File Name File Size Zip Size Zip Type
BUG.DOC 5167 1185 deflated
INCLUDE.ZIP 37112 32049 deflated
PACKING.LST 4620 1333 deflated
READ.ME 10620 3703 deflated
REGISTER.DOC 4172 1108 deflated
TCHK.DOC 128232 32355 deflated
TCHK.GEN 553 306 deflated
TCHK.MSG 1477 695 deflated
TCHK.PRO 255 194 deflated
TCHK.ZDR 370 253 deflated
TCHKF.DOC 457100 71376 deflated
TCHKS.LIB 172814 56682 deflated
TCHKS.TC 1690 436 deflated
TURBOC.CFG 225 123 deflated

Download File TCHK21.ZIP Here

Contents of the READ.ME file

Last minute notes for TCHK 2.1:

Just a couple of quick notes that didn't make it into the documentation.

- The file list in the documentation is not accurate. Refer to the
file PACKING.LST for the most up to date list of files

- TCHK 2.1 is distributed in 3 parts:

TCHK21.ZIP - Documentation, Library, Header and Support files
TCHK21EX.ZIP - Examples for TCHK 2.1 (source and executables)
TCHK21NG.ZIP - Norton Guide for TCHK 2.1

- In addition to those benefits listed in the documentation,
registered users will also receive the source to the Norton Guide
for TCHK 2.1

- The file TCHKS.CFG is a configuration file for TCHK for the command
line compiler. Since the .TC format for 2.0 is not compatible with
the 1.5 version, TCHKS.CFG is included for your convenience. Note
that TCHKS.CFG was created with Borland's utility TCCONFIG.EXE
operating on TCHKS.TC. The resulting file had all -D options removed
from it (Compiler Defines). See the documentation for the data types
byte, word and bboolean for more information.

- TCHK 2.1 should work with Turbo C 1.5 as well as 2.0. The only
changes made from TC 1.5 to 2.0 were debugging and compiler/linker
speed. The actual libraries have not been changed (except for some
minor bug fixes). I have not personally tested this, but several
people have inquired and after telling them it should work I never
heard from them again. Borland did not change any object/library
file formats from 1.5 to 2.0, so everything should be kosher. Patches
for the 1.5 libraries still work with the 2.0 libraries, so TCHK
should be compatible also.

- Due to some problems with the mouse on my system, I have not been
able to fully test all the mouse functions. Fortunately, the demo
was compiled before any of these problems started appearing, so
it should be fine. However, due to an oversight on my part,
the mouse functions are not fully documented. Each individual
function is documented, but programming a mouse in general is not
explained to my satisfaction. Microsoft Press has recently released
a book about mouse programming which I recommend for you serious
rodent fans. For those of you without MS's book, see the end of this
file for some general explanations of how the mouse works. By the
next release the mouse functions will be expanded to provide greater
support, especially during text modes since dealing with the cells
per character is annoying.

Note that this is not intended as a mouse manual, but rather
a brief outline.

- A full blown demo of pretty much all the features of TCHK is in
the works, but is not yet ready for distribution and will not be
found with TCHK 2.1. See the examples provided in TCHK21EX.ZIP for
some smaller samples.

- Customized versions of TCHK for specialized applications can be
provided on request for a modest fee. Please contact me for further

Howard Kapustein

Author of TCHK


I. Screen Modes

The screen mode defines the number of pixels on the screen and the
types of objects that appear on the screen. The available screen
modes depend on the type of display adapter you have in your
computer. The following table lists these screen modes and adapters
that support them:
Display Screen Cell Bits/Pixel
Mode Adapter (X x Y) Size (Graphics Modes)
0 CGA,EGA,3270 640x200 16x8 --
1 CGA,EGA,3270 640x200 16x8 --
2 CGA,EGA,3270 640x200 8x8 --
3 CGA,EGA,3270 640x200 8x1 --
4 CGA,EGA,3270 640x200 2x1 2
5 CGA,EGA,3270 640x200 2x1 2
6 CGA,EGA,3270 640x200 1x1 1
7 MDA,EGA,3270 640x200 8x8 --
D EGA Not supported
E EGA 640x200 1x1 1
F EGA 640x350 1x1 1
*10 EGA 640x350 1x1 1
30 3270 720x350 1x1 1
Hercules 720x348 1x1 1

Mode values are hex (0x...)
3270 = IBM All Points Addressable Graphics Adapter (3270 PC)

The mouse software should support other video modes, but I only
have documentation for these modes. This is not intended to be a
mouse manual, just a brief outline.

* = Mouse will not display properly in this mode on an EGA card
with only 64K RAM; 128K RAM is needed

II. Virtual Screen

The mouse operates on the computer's screen as if it were a virtual
screen. The "Virtual Screen" column in the table above gives the
number of horizontal and vertical virtual points for each supported
screen mode. Whenever INT 0x10 is called to change the screen mode,
the mouse software intercepts the call and determines which virtual
screen to use. The mouse software also reads the screen mode and
chooses the appropriate virtual screen whenever ismouse() is called
to reset default parameters values in the mouse software.

Regardless of the screen mode, the software uses a pair of virtual
screen coordinates to locate an object on the screen. Each pair of
coordinates defines a point on the virtual screen.

Many mouse functions take virtual screen coordinates as input, or
return them as output. Whenever you refer to a pixel or character in
a mouse function, make sure that the horizontal and vertical
coordinates are the correct values for the given screen mode. If you
supply an incorrect value, the function rounds the value down before
continuing. The mouse functions always return correct vlaues for the
given screen mode.

1. Graphics Modes 6, E, F, 10, 30 and Hercules

Each point in the virtual screen has a one-to-one correspondence
with each pixel on the screen. The full range of coordinates in
the "Virtual Screen" column is permitted.

2. Graphics Modes 4 and 5

The screen has half the number of pixels that it has in the
other graphics modes. To compensate, the mouse software uses
only even-numbered horizontal coordinates. This means that every
other point in the virtual screen corresponds to a pixel.

3. Text Modes 2,3 and 7

Each character is an 8- by 8-pixel group (see the "Cell Size"
column in the table above).

Because the mouse software cannot access individual pixels in a
character, it uses the coordinates of the pixel in the upper
left corner of the character for the character's location. Since
each character is an 8- by 8-pixel group, both the horizontal
and vertical coordinates are multiples of 8. On a standard 80
column by 25 line screen, the virtual coorindates will range
from 0,0 (upper left corner) to 632,192 (lower right corner).

4. Text Modes 0 and 1

Each character is a 16- by 8-pixel group (see the "Cell Size"
column in the table above). See II.3. ("Text Modes 2,3 and 7")
for more details.

III. Graphics Cursor "Hot Spot"

Whenever a mouse functions refers to the graphics cursor location,
it gives the point on the virtual screen that lies directly under
the cursor's "hot spot". The hot spot is the point in the cursor
block that the mouse software uses to determine the cursor
coordinates. The coorindates can be within the range -16 to 16;
however, in modes 4 and 5, the horizontal coordinate must be an even
number. In all graphics modes, the coordinates are relative to the
upper left corner of the cursor block.

IV. Software Text Cursor

Using MCursorText() the cursor in text modes can be changed. If the
software cursor is used, the 16 bits of screen data are illustrated

bit 15 14 12 11 10 8 7 0

b background i foreground character

b = blink
background = background color
i = intensity
foreground = foreground color
character = ASCII character

The high order byte is the attribute and the low order byte is the
ASCII character.

The screen data is ANDed with the screen mask (parm1) and then XORed
with the cursor mask (parm2). See the MCursorText() call in
DEMOMOUS.C for an example.

The text cursor does not have a hot spot.

V. Mouse Unit of Distance: The Mickey

The mouse unit of distance is called a mickey, which is
approximately 1/200 of an inch.

The number of pixels that the cursor moves does not have to
correspond one-to-one with the number of mickeys the track ball

VI. Internal Cursor Flag

The mouse software maintains an internal flag that determines when
the cursor should be displayed on the screen. The value of this flag
is always 0 or less.

- When the flag is 0, the cursor is displayed
- When the flag is any other value, the cursor is hidden

Application programs cannot access this flag directly. To change the
flag's value, the program must call MCursorOn() and MCursorOff(),
which increment and decrement the flag, respectively.

Calling ismouse() resets the flag to -1 and hides the cursor.

Your program can call either MCursorOn() or MCursorOff() any number
of times, but if it calls MCursorOff() it must call MCursorOn()
later on to restore the flag's previous value. For example, if the
cursor is visible and your program calls MCursorOff() five times,
you must call MCursorOn() five times for it to be visible again.

- fini -

 December 13, 2017  Add comments

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