BASIC 8


BASIC 8 "The Enhanced Graphics System For The C128" developed by Walrusoft of Gainesville, Florida and published in 1986 by Patech Software of Somerset, New Jersey, USA, was an extension of Commodore's BASIC 7.0 for the C128 home/personal computer. BASIC 8.0 provided commands lacking in BASIC 7.0 to generate graphics in the C128's high-resolution 80-column mode for RGB monitors.
The BASIC 8 package was developed by Walrusoft's Louis Wallace and David Darus, with contributions from Ken French and indirectly from Richard Rylander.

Background and description

The problem

One of the primary critiques of Commodore's computers was that their BASIC programming language dialects lacked easy sound, graphics, and input device 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, sound and music, or read from joysticks and paddles. The BASIC 2.0 of the Commodore 64, totally devoid 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. However, 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 graphics chip was much harder to program than the VIC-II.

A solution

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 188-page manual, the included software package included a BASIC 8.0 example of a GUI, and a BASIC 8.0 based high-res paint program, Basic Paint.

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. The use of this character would allow the developer to extend BASIC 7.0 without having to re-tokenize the commands as it was done on the C64. It was accomplished by trapping the syntax error generated by the command.