1. COMPUTE! #12, pg. 94. The authors suggest that the following lines should be changed to:
255 UG = GU:PRINT 257 IFGU = 0 THEN 270 290 WD = WI:WF = WI:WT = (12-WI)/2 370 IF WI>4 THEN 300 530 IF WT<0 OR WT = 0THEN WT=l:RN = 0 610 IF PEEK(KY)=251THEN ME = ME-1:KK = -1 1060 IF WD<3 THEN PRINT "LITTLE";: GOTO 1200 1120 PRINT "CHEATER"; 1200 PRINT "FOO";
2. COMPUTE! #17, pg. 112. The following changes to the "Atari Program Library" will lock all cataloged programs. Then, after adding new programs to a disk, only the unlocked (new) programs need to be cataloged:
420 IF B<3 THEN ?"DISK IS#";VOL$: XI035,#3,0,0,"D:*.*":?:?"INSERT LIBRARY DISK" 370 IF IN$(1,1) = "*" OR DSN$ = "DOS.SYS" OR DSN$ = "DUP.SYS" OR DSN$ = "MEM.SAV" OR DSN$ = "DISK.CAT" THEN 310
3. COMPUTE! #17, pg. 143. Mr. Swaim has suggested the following lines as an alternative way to load the X$ array for business keyboard users and to correct an error in transcription:
110 X$(1) = CHR$(164):X$(2) = CHR$(175): X$(3) = CHR$(185): X$(4) = CHR$(162) 112 X$(5) = CHR$(18) + CHR$(184) + CHR$(146): X$(6) = CHR$(18) + CHR$(183) + CHR$(146) 115 X$(7) = CHR$(18) + CHR$(163) + CHR$(146): X$(8) = CHR$( 18) + CHR$(32) + CHR$(146)
4. COMPUTE! #17, Pg. 152. The correct SYS is 7168 in line 120.
5. COMPUTE! #17, pg. 162. Table 1 is missing number 9, Subtraction:
Load FPAC1 with subtrahend
|LDA AL||source address|
|LDY AH||for minuend|
(Addressed value is loaded into FPAC2, FPAC1 is subtracted from FPAC2 and result in FPAC1; FPAC2 unchanged.)
Number 6 should include JSR $C0D 1.
COMPUTE!'s Listing Conventions
Many programs which are listed in COMPUTE! use cursor control keys, color keys, and so forth. We have established a listing convention which we believe eases the task of typing programs in accurately.
For the Atari, all the editing and cursor-control characters are spelled out and surrounded by brackets: [CLEAR] for "clear screen." Other characters, such as CTRL-T (the "ball" character) will be listed as the "normal" character, but within brackets: [T]. A series of identical control characters will be indicated by a number within the brackets: [3 DOWN] means type the cursor-down key three times; [12 R] means type CTRL-R twelve times.
Two control characters, [ = ] and [ - ] should be shifted. Any reverse field text will be enclosed within vertical lines. (Press the Atari logo key  for each vertical line you see.)
Generally, PET/CBM/VIC programs will contain bracketed words for any special characters: [DOWN] means the cursor-down key; [3 DOWN] means type the cursor-down key three times.
If a program line runs over onto the next line down, the ˜symbol indicates where the line broke (in case the number of spaces is unclear between quotes). An underline means that that key is shifted.
8032/Fat 40 Conventions
SET WINDOW TOP [SET TOP] SET WINDOW BOTTOM [SET BOT] SCROLL UP [SCR UP] SCROLL DOWN [SCR DOWN] INSERT LINE [INST LINE] DELETE LINE [DEL LINE] ERASE TO BEGINNING [ERASE BEG] ERASE TO END [ERASE END1 TOGGLE TAB [TGL TAB] TAB [TAB] ESCAPE KEY [ESC]
ALL Commodore Machines
CLEAR SCREEN [CLEAR] HOME CURSOR [HOME] CURSOR UP [UP] CURSOR DOWN [DOWN] CURSOR RIGHT [RIGHT] CURSOR LEFT [LEFT] INSERT CHARACTER [INST] DELETE CHARACTER [DEL] REVERSE FIELD ON [RVS] REVERSE FIELD OFF [OFF]
SET COLOR TO BLACK [BLK] SET COLOR TO WHITE [WHT] SET COLOR TO RED [RED] SET COLOR TO CYAN [CYN] SET COLOR TO PURPLE [PUR] SET COLOR TO GREEN [GRN] SET COLOR TO BLUE [BLU] SET COLOR TO YELLOW [YEL] FUNCTION ONE [Fl) FUNCTION TWO [F2] FUNCTION THREE [F3] FUNCTION FOUR [F4] FUNCTION FIVE [F5] FUNCTION SIX [F6] FUNCTION SEVEN [F7] FUNCTION EIGHT [F8] ANY NON-IMPLEMENTED FUNCTION [NIM]