ABCs of Atari computers by David E Mentley

By David E Mentley

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Atari, Inc. BOO LEAN 0 PE RATO RS - Atari BASIC uses a logical operation developed in the 19th century by mathematician George Boole. The Boolean is a statement or comparison set off by parentheses, which, if true, takes the value of one. If the comparison is not true then it takes the value of zero. You may have seen some BASIC programs with Booleans and assumed that they were typos. Documentation on Boolean operators is very skimpy in the Atari BASIC Manual. The following example will help clarify their usage.

SYS wipe out the RS 232 handler when it is loaded. Therefore, no output to the R: device is possible from the DOS menu. 44 BULLETIN BOARD BU LLETI N BOARD - A revolution is sweeping the country because of the availability and low prices of computers and communications devices. BULLETIN BOARDs are a major part of this revolution. A BULLETIN BOARD is a computer with a BULLETIN BOARD program, auto-answer modem, and a telephone line. Many users groups have set up BULLETIN BOARDs as a central exchange for ideas and public domain software.

BCS will branch to another part of memory when the CARRY FLAG is set to 1. The Assembler/Editor cartridge can be used to monitor the Processor Register Status in the TRACE mode. CARTR I DG ES - The Atari 800 has two slots for plug-in ROM (Read Only Memory) CARTRIDGEs. All other Atari computers have one slot. The ROM CARTRIDGEs contain machine language programs which reside in memory. The left CARTRIDGE (Cartridge A) occupies 8K of memory between 40960 and 49151 ($AOOO to $BFFF). If no CARTRIDGE is inserted, this memory is free for other use.

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