A guide to the ZX Spectrum keyboard and a description of the display.
Programs, line numbers, editing programs using
, 
and EDIT, RUN, LIST, GO TO, CONTINUE, INPUT, NEW, REM, PRINT, STOP in INPUT data, BREAKIF, STOP, =, <, >, <=, >=, <>
FOR, NEXT, TO, STEP. Introducing FOR-NEXT loops
GO SUB, RETURN
Mathematical expressions using +, -, *, /, scientific notation and variable names.
Handling strings and slicing.
User-definable functions and others readily available on the ZX Spectrum using DEF, LEN, STR$, VAL, SGN, ABS, INT, SQR, FN
Including simple trigonometry:
, PI, EXP, LN, SIN, COS, TAN, ASN, ACS, ATNUsing RANDOMIZE and RND.
Strings and numeric arrays - DIM.
Logical expressions: AND, OR, NOT.
A look at the ZX character set including graphics and how to construct your own graphic characters: CODE, CHR$, POKE, PEEK, USR, BIN
Some more complicated uses of these commands using separators: ,;' , TAB, AT, LINE and CLS.
INK, PAPER, FLASH, BRIGHT, INVERSE, OVER, BORDER
PLOT, DRAW, CIRCLE, POINT
Animated graphics using PAUSE, INKEY$ and PEEK.
The sound capabilities of the ZX Spectrum using BEEP.
How to store your programs on cassette tape: SAVE, LOAD, VERIFY, MERGE.
LLIST, LPRINT, COPY
Connecting the ZX Spectrum to other machines and devices.
Input/Output ports and their uses: IN, OUT
A look at the internal workings of the ZX Spectrum: CLEAR
Introducing USR with a numeric argument