Radio Shack TRS-80 Expansion Interface: Operator's Manual Catalog Numbers: 26-1140, 26-1141, 26-1142

"Radio Shack TRS-80 Expansion Interface: Operator's Manual" by Anonymous is a guide from the past that teaches people how to get more out of their TRS-80 computer. It's like a detailed instruction book that shows how to hook up different gadgets to the computer using something called an expansion interface. The manual explains all the parts of this interface, like where the power goes in and where to plug things. It also tells about extra devices you can add, such as printers and tape recorders so you can save what you made. The guide walks through how to set everything up and make it work, but tells you to be careful about which version of BASIC the computer uses so you don't run into problems. It's mostly a way to assist computer users in understanding the complex details of how to improve what their system can do.