ZX80/ZX81 graphics character codes chart, top codes for ZX81 and bottom codes for ZX80Basic statements table (ZX80 only / ZX81 only)Basic commands, edit subcommands, cursors and markers tableBasic functions table: character/string, numeric, math, I/O and other functionsDerived functions table: inverse, hyperbolic and inverse hyperbolicZX81 memory map (system variables 0 to 32767)
Published 1982 by Nanos Systems Corp., P.O. Box 24344, Speedway, IN 46224 (317)244-4078. Printed in U.S.A.