TO DO: A summary of what it does
Implemented by: dartmouth5, altair8K, Applesoft, TI994, CBM, Atari, msatari, level2, trscolor, colormc, Sinclair, spectrum, BBC, GWBASIC, MSX, bwbasic, ABasiC, QBasic, VBDOS, Gambas, minibasicmm, minibasicjs
With variations:
Also written as: