Basic building blocks of JavaScript. Getting a closure on JavaScript.

Welcome to PCjs, home of the original online IBM PC emulator for your web browser. The PCjs Project offers a variety of online computer emulators written in JavaScript, including PCx86 for x86-based machines (8088 through 80386), C1Pjs for the 6502-based Ohio Scientific Challenger 1P, PC8080 for 8080-based machines like Space Invaders and the DEC VT100 Terminal, PDPjs with support for PDP-10 and PDP-11 machines, and emulators of classic programmable calculators, like the TI-57. PCjs also provides an archive of selected historical PC software, publications, and reference materials.

SpecBAS incorporates all the features of Sinclair BASIC, but with more: Procedures, with both referenced and normal variable parameters Flow control with DO..LOOP, WHILE..LOOP, DO..UNTIL Better array handling, with variable BASE settings and FOR..EACH support Better string handling with LEFT$, RIGHT$, MID$, REPEAT$ etc Memory banks which can be loaded, saved and utilised to hold a variety of data types Many, many more maths functions, with both radians and degrees support Graphics with 8bpp in any supported resolution with full palette changing, rotation, scaling etc Sound support with MOD/S3M/XM/IT/MP3/VOC/WAV etc Turtle graphics, sprites, tilemaps.

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