See all articles from SIN n2 Sept 1985
Custom functions for converting Microsoft BASIC LEFT$, RIGHT$, and MID$ to Sinclair BASIC.
LEFT$(A$,x) => DEF FN L$(A$,x)=A$(TO x)
RIGHT$(A$,x) => DEF FN R$(A$,x)=A$(x+1 TO)
MID$(A$,x,t) => DEF FN M$(A$,x,y)=A$(x to (x+y)-1)