ABCs of Atari computers by David E Mentley

By David E Mentley

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EXAMPLE: PRINT CLOG(100) will print a 2. ) - CLOSE is the command to close an IOCB which has been OPENed for input or output by a previous statement. If you try to OPEN a particular channel which is already OPENed, you will get an error message. The format to CLOSE an IOCB is simply: CLOSE =#= X, where X is the OPENed IOCB. An END statement CLOSEs all OPENed channels. CLR - The CLR command in BASIC does not clear the screen. It is used to clear the values of all numeric variables. It also frees up the memory used by DIMensioning strings and arrays.

BYTE 156 BYTE (BIHARY) 100~ ....... , / 1101 N l68lf (8INRR'() 1001 q 1101 OECIJ"IAL 13 D q tlDlDECIMAL \ ....... / - "- 45 , BYTE D7 D6 D5 D3 D4 D2 D1 DO Each of the eight locations may contain a 1 or a o. If all the locations contained a 1 then the byte would have a valueof255 (128+64+32+16+8+4+2+ 1). See the discussion of BIT. When the value of a particular byte is displayed or printed, it appears as a hexadecimalpairofnumbers. The hexadecimal system has 16 digits-O, 1, 2, 3, 4, 5, 6, 7,8,9, A, B, C, D, E and F.

Since the program is written for one disk drive, a lot of disk swapping is required to fully use this package. 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.

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