Software

Code snippets/demos

Environment	Hardware and software interrupts	Video mode detect and set; framebuffer access	Raw keyboard input functions (kbhit and getch)
DOS; 16-bit Watcom C	wat16int.c	tcvbe.c	(use CONIO.H)
DOS; 32-bit Watcom C; CauseWay DOS extender	wat32int.c	wat32vbe.c	(use CONIO.H)
DOS; DJGPP (32-bit)	djint.c	djvbe.c	(use CONIO.H)
DOS; Turbo C (16-bit)	tcint.c	tcvbe.c	(use CONIO.H)
Linux	linuxint.c	linuxvid.c	kbhit.c
Win32	winint.c	winvid.c	winkey

Haruhiko Okumura's LZSS (de)compression program, modified to be compatible with files produced by Microsoft COMPRESS. The text file in this .ZIP contains a short but interesting history of data compression.

Copy a chunk of sound from one .WAV file to another. Good for editing gigantic sound files on systems with little RAM.

C code to recursively traverse a file hierarchy. Output is similar to that of 'dir /s /b' under MS-DOS.

A program to convert text Usenet messages to framed HTML. Here is a screenshot of the output.

play audio CD without MSCDEX (DOS)

C++ fixed-point class

Tetris for DOS (requires ANSI.SYS) or Linux

Assembly-language programs:

DOS program (NASM source) to put screen in 90x60 text mode
DOS program (NASM source) to put screen in 90x30 text mode
Assembly-language 'hello' programs for DOS (3), Win32 (4), and Linux (3); using various assemblers (NASM, TASM, AS, WASM) and linkers (ALINK, TLINK, ILINK32, LD).

DJGPP programs:

Graphics programs:

Dumps markers/segments in JPEG files
Generate HTML <IMG> tag with proper WIDTH and HEIGHT from a GIF, PNG, or JPEG file.
Animated GIF viewer (DOS). Under construction. This code desperately needs some kind of color-reduction algorithm. The PNG code doesn't work yet, and I've removed the BMP and PCX code for now.
Add comment block to JPEG image file
Add comment block to GIF89 image file
Disable transparency in .GIF files. This is mainly for .GIF files containing anti-aliased text and graphics. Observe:
- Before. Assuming a white background, are we?
- After. One bit in the .GIF file was changed.
Code snippet to read BMP file into memory.

Taliesin GUI/graphics library

Updated Nov 29, 2005. Still lots of functionality missing. The main improvements are:

Support for RGB color (16-, 24-, and 32-bit)
blit() and blot() functions for VBE 1.x banked framebuffer have been debugged.

Screen shot. The menus don't work and the windows don't do anything.

In-memory bitmaps and screen bitmap (framebuffer) are indistinguishable to the programmer.
Written in C, with one function (shift) in asm.
Works in both 16-bit real mode and 32-bit pmode.
Very modular; can leave out the bits you don't want/need.
Support for non-Latin text (e.g. Arabic)
"Virtual" screen; larger than displayed screen area; scrolls when mouse is moved against the screen edge.
1-bit (monochrome), 2-bit packed pixel (4-color), 4-plane (16-color), and 8-bit (256-color) bitmaps.
Loads and displays BDF fonts.
Windows. Efficient clipping engine.

Known bugs:

Breaks in the horizontal parts of the lasso (selection rectangle).
Banked 8-bit driver is unstable, and causes segfaults.
2-bit (4-color) driver is incomplete.

sndpkg

Sound player for DOS with Windows Sound System (WSS). Plays .wav or .au files in linear PCM, MS-ADPCM, A-law, or u-law codecs. This is greatly improved over the last release, but I am still trying to get the Sound Blaster driver, Win32 driver, and WSS softset working.