ZX81 BASIC Programming

Sinclair ZX81 BASIC Programming
by Steven Vickers
Second Edition 1981

CHAPTER 1	Setting up the ZX81 & how to use this manual, whether or not you know BASIC.
CHAPTER 2	Telling the computer what to do How to type things in to the computer , , RUBOUT, NEWLINE
CHAPTER 3	A History lesson
CHAPTER 4	The Sinclair ZX81 as a pocket calculator Statement: PRINT with commas & semicolons Operations: +, -, , /, * Expressions & scientific notation
CHAPTER 5	Functions Statement: RAND Functions: ABS, SGN, SIN, COS, TAN, ASN, ACS, ATN, LN, EXP, SQR, INT, PI, RND, FUNCTION
CHAPTER 6	Variables Statements: LET, CLEAR Simple numeric variables
CHAPTER 7	Strings Operation: + (for strings) Functions: LEN, VALSTR$ Strings, simple string variables
CHAPTER 8	Computer programming Statements: RUN, LIST Programs Editing programs using , & EDIT
CHAPTER 9	More computer programming Statements: GOTO, CONT, INPUT, NEW, REM, PRINT STOP in INPUT data BREAK
CHAPTER 10	If... Statements: IF, STOP Operations: =, <, >, <=, >=, <>, AND, OR Function: NOT
CHAPTER 11	The character set Functions: CODE, CHR$ The character set is thoroughly non-standard GRAPHICS
CHAPTER 12	Looping Statements: FOR, NEXT, TO, STEP
CHAPTER 13	SLOW & FAST Statements: SLOW, FAST The ZX81 operates at two speeds: one neat, the other fast.
CHAPTER 14	Subroutines Statements: GOSUB, RETURN
CHAPTER 15	Making your programs work Flowcharts & debugging
CHAPTER 16	Tape storage Statements: SAVE, LOAD
CHAPTER 17	Printing with frills Statements: CLS, SCROLL PRINT items: AT, TAB
CHAPTER 18	Graphics Statements: PLOT, UNPLOT
CHAPTER 19	Time & motion Statement: PAUSE Function: INKEY$
CHAPTER 20	The ZX81 Printer Statements: LPRINT, LLIST, COPY
CHAPTER 21	Substrings Slicing, using TO
CHAPTER 22	Arrays Statement: DIM
CHAPTER 23	When the computer gets full Odd things happen
CHAPTER 24	Counting on your fingers Binary & hexadecimal counting
CHAPTER 25	How the computer works What the individual chips do Statement: POKE Function: PEEK
CHAPTER 26	Using machine code Statement: NEW Function: USR
CHAPTER 27	Organization of memory
CHAPTER 28	System variables

APPENDICES
A The character set
B Report codes
C The ZX81 for those that understand BASIC