Radio Shack

This 1981 manual was written for people who already have a thorough understanding of electronics and computer circuitry. Is is not a beginner's manual.

The manual contains detailed schematics and theories of operation for each major part of the Model 3 TRS-80 Microcomputer. The information in this book enabled me to design interfaces for computers in my college computer lab and to make my own repairs. Preventive maintenance was a must on the TRS-80 floppy disk drives with their penchant for show more dirty heads and sticky rails. show less

This collection of TRS-80 Microcomputer Newsletters includes all issues (N=20) from the first issue published in 1977 through December, 1980. Much of the early history of the TRS-80 line of microcomputers is told in these pages. I took delivery of the first Model I TRS-80 sold in Knoxville, Tennessee, in October, 1977. I read and re-read each of these newsletters as soon as they were delivered to my mailbox. Many of the subroutines and algorithms found in the newsletters were later show more incorporated into my BASIC programming projects. show less

This manual assumes that the reader has already mastered Level I BASIC as presented in tutorial fashion in the Level I Manual. The Level II Manual is a reference-only manual, not a tutorial. For a tutorial on Level II BASIC, see Programming Techniques for Level II BASIC (1981) by William Barden Jr.

Level II is a far more powerful version of BASIC than Level I. It prepared me well for making the transition to the version of Microsoft BASIC that ran on the IBM XT and after that for the show more transition to QuickBASIC on IBM PC compatibles.

When the Level II Manual came out, the TRS-80 still loaded its programs from, and saved them to, a tape cassette. By adding an Expansion Interface to the Model I TRS-80, owners could add an additional cassette deck, a TRS-80 line printer, up to four floppy disk drives, and up to 48KB of RAM memory, all of which could be addressed by Level II BASIC and its successor, Disk BASIC on TRSDOS for floppy disks. show less

This is a handy reference was published in 1982 for looking up electronics formulas and laws, mathematical tables and formulas, amateur radio communications data, cable and copper wire specifications, and miscellaneous conversions.