The Z-80 Microcomputer Handbook 1978 FIRST EDITION BY WILLIAM BARDEN JR

3-Radio Shack 26-2103 TRS-80 Microcomputer Technical Reference Handbook

VINTAGE 1980- THE Z-80 MICROCOMPUTER HANDBOOK - 304 PAGES

1982 DEC Digital Equipment Corporation Microcomputers and Memories Handbook

Radio Shack Tandy TRS-80 Micro Computer Technical Reference Manual Handbook

Radio Shack TRS-80 Micro Computer (MODEL I) Technical Reference Handbook 26-2103

the Z-80 microcomputer handbook - 1978 - 300 Pages

DEC Digital Microcomputer Products Handbook 1985