Sinclair BASIC - T/S 2000 BASIC

T/S 2000 BASIC

The BASIC dialect used on the Spectrum-compatible TS2068, but not the TC2048, which used the ordinary Sinclair BASIC, has the following six keywords as well as the ordinary Sinclair BASIC ones:

• DELETE deletes BASIC program line ranges. ⇧ Shift+0 with the K cursor produces the command DELETE.
• FREE is a function that gives the amount of free RAM. PRINT FREE will show how much RAM is free.
• ON ERR is an error detection function mostly used as ON ERR GO TO or ON ERR CONT.
• RESET can be used to reset the behaviour of ON ERR. It was also intended to reset peripherals.
• SOUND controls the AY-3-8192 sound chip.
• STICK is a function that gives the position of the internal joystick (Timex Sinclair 2090).

Zebra Systems in New York released a cartridge called ZebraOS; a version of T/S 2000 BASIC that used the 512x192 screen mode. Timex of Portugal released a software extension called BASIC64 to allow better Basic programming with the advanced 512x192 graphic mode available only on Timex 2000 series computers. This extension added commands and do a complete memory remap to avoid the system to overwrite the extended screen memory area. Two versions existed: a version for TC2048 and a version for TS/TC2068 because they have different memory map.