BASIC 8.0 (or BASIC 8) was WalrusSoft 's extended version of Commodore's BASIC 7.0 for the C128 home/personal computer. BASIC 8.0 provided commands to generate (color) graphics in the C128's high-resolution 80-column mode (640×200 pixels) for RGB monitors.

Background and description

One of the primary critiques of Commodore's computers was that their BASIC programming language dialects lacked easy sound and graphics commands, like their competitors in the Apple II and Atari 8-bit families – requiring obscure PEEK and POKE sequences, or machine language routines, to generate high-resolution graphics. The BASIC 2.0 of the Commodore 64, totally void of sound and graphics commands, induced the development of many third-party language extensions, such as Simons' BASIC , enabling non-expert users to enter the world of computer graphics.

When the C128 was launched, its BASIC 7.0 contained a host of (sound and) graphics commands, but, disappointingly, they only worked in the "40-column" video mode, i.e. the TV/composite monitor mode with a resolution equal to the C64's. Users who wanted to program graphics in the C128's new high-resolution "80-column mode", primarily intended for RGBI monitors, found themselves in an even worse position than previously with the C64, since the C128's 8563 VDC (Video Display Controller) was much harder to program than the VIC-II.

BASIC 8.0 filled in the gap. It came on floppy disk and ROM chip versions, and provided many graphics commands that were competitive with the C128's opposition in the high-end 8-bit microcomputer market. BASIC 8.0 was fully compatible with the various first-party RAM and video RAM expansion chips and cartridges, as well as mice and joysticks. In addition, it had basic 3D graphics commands. Along with a decent manual, the included software package included a BASIC 8.0 example of a GUI, and a BASIC 8.0 based high-res paint program.

Source code, copy protection

Source code of some of the BASIC 8 package was provided, and the BASIC 8.0 disk lacked any sort of copy protection, but this was before the Open Source Initiative; it was done as a courtesy. Instead of threatening legal action (as with the Microsoft EULA or the GNU GPL), WalrusSoft simply asked users not to copy the software in the documentation. It worked; BASIC 8.0 became one of the best selling expansions for the C128.

Sample commands

In BASIC 8.0, all added commands were prefaced with the @ mark, which was not normally used in Commodore BASIC, to distinguish between the original and the new keywords.

• @CHAR – Displays a text string on a bitmap field (similar to the BASIC 7.0's low-res CHAR command)
• @MODE – Switch between one of up to 32 high-res screens
• @PAINT – Fill a closed area with a color or a pattern
• @PIXEL – Returns the color value of a pixel
• @STASH – Copies part or all of a screen for later usage
• @WALRUS – Displays the WalrusSoft logo and the type/size of video RAM used (16K or 64K)
• @WINDOWOPEN – Define part of the screen as a 'window' for purposes of drawing

External links

• BASIC 8.0 Manual – Flat text file; from the Project 64 documentation project