TRS-80 Color Computer Interfacing, With Experiments by Andrew Staugaard

Programming and Interfacing the 6502, with Experiments Marvin L De Jong

Custom TRS-80 & Other Mysteries Book Dennis Kitsz Information Series Volume III

TRS-80 Interfacing Vintage Computer Book Larsen Titus & Titus Blacksburg Ex-Lib

BLACKSBURG TEA 8080 8085 Co-Resident Editor/Assembler 1979 1st. Ed. 1st Print

Vintage 1982 Trs-80 Color Computer Programs Book, Colorstat, & Hi-Res Bundle

Fundamentals of Z80 Microcomputer Programming & Interface w/Experiments.

Practical Interfacing Techniques for Microprocessor Systems by James Coffron