There are 4 Main BASIC languages from Texas Instruments I use. TI 99 BASIC TI 99 Extended BASIC TI 68K BASIC (Also called TI-89 BASIC) TI Z80 BASIC (Also called TI-83 BASIC) Yes, TI has *many* more than these four BASICs. But in my world and I believe the majority of people, these are the big four. But there are other fairly common TI BASICs like: TI-CC40 BASIC TI-81/TI-82 BASIC TI-85/TI-86 BASIC I will cover these three a bit also. This document has the purpose of hopefully show obvious differences between and giving some useful tips for converting code from different types of BASIC. For example, code converted from TI 99 Extended BASIC to TI 68k BASIC TI 99 BASIC and TI 99 Extended BASIS is for the following devices: TI-99/4 Desktop computer TI-99/4A Desktop computer TI 68K BASIC is for the following devices: TI-89 Calculator TI-89 Ti (Titanium) Calculator TI-92 Handheld TI-92 II Handheld TI-92 Plus Handheld TI Voyage 200 Handheld TI Z80 BASIC is for the following devices: TI-83 Calculator TI-83 Plus Calculator TI-84 Plus Calculator TI-84 Plus SE Calculator Variable storage TI-99 BASIC, TI-99 Extended BASIC, TI-CC40 BASIC store values differently than TI 68K BASIC, TI Z80 BASIC, and most of all the other TI BASICS TI-99 and TI-CC40 example: 100 x=5 TI-85 example: :x=5 TI 68K BASIC and TI Z80 BASIC example: :5→x Moving around Code TI 99 and 99 Extended BASIC use line numbers with GOTO statement TI 68K and TI Z80 use Lbl with Goto statement Example TI 99 BASIC: 100 GOTO 550 ... 550 PRINT "Menu" ... Example TI 68K BASIC: :Goto Menu ... :Lbl Menu :Disp "Menu" ... Variable names - TI 99 BASIC variable names can have up to 15 characters. - TI 68K BASIC variable names can have up to 8 characters. - TI Z80 BASIC variable names can have up to 5 characters. If those limits feel weak, the C64 BASIC and Apple II BASIC could only have up to just 2 characters. Anything after was ignored. IO text statements PRINT statement is about the equivalent to the Disp statement. DISPLAY AT statement is about the equivalent to the Output statement. Example 1 - TI 99 BASIC and TI 99 Extended BASIC: 10 PRINT "HELLO, WORLD!" versus TI 68K BASIC and TI Z80 BASIC :Disp "HELLO, WORLD!" Disp statement works with *almost* all TI BASICs including TI-81/TI-82 BASIC and TI-85/TI-86 BASIC. All 4 BASICs vary greatly with text placement commands. DISPLAY AT is only available with TI 99 Extended BASIC, not TI 99 BASIC. Output and DISPLAY AT is not an exact 1 for 1 replacement. Example 2 - TI 99 Extended BASIC 10 DISPLAY AT (5,5) "THIS TEXT" is 5 charters, by 5 characters from the upper left versus TI 68K BASIC :Output 5,5,"THIS TEXT" is 5 pixels, by 5 pixels from the upper left Versus TI Z80 BASIC :Output(5,5,"THIS TEXT") Versus TI-85 BASIC :Outpt(5,5,"THIS TEXT") Random numbers TI 99 BASIC or TI 99 Extended BASIC, to find a random integer number from 1 to 10 and store in a variable named num1 10 num1=INT(1+10*RND) TI 68K BASIC, to find a random integer number from 1 to 10 and store in a variable named num1 :rand(10)→num1 TI Z80 BASIC, to find a random integer number from 1 to 10 :randInt(1,10)→num1 TI-85 BASIC :randM(1,10)→num1 Comments TI 99 BASIC 10 REM This is a comment TI Z80 BASIC : " This is a comment TI 68K BASIC : @ This is a comment Clearing the screen CALL CLEAR for TI 99 BASIC and TI 99 Extended BASIC ClrHome for Z80 BASIC, also TI-81/TI-82 BASIC ClLCD for the TI-85/TI-86 BASIC ClrIO for 68K BASIC for IO output screen ClrGraph for 68K BASIC plotting output screen