Selectric Hard Copy

Bickerton, M.D. 2631 Wharton St. Philadelphia, PA 19146 It didn't take long after buying my TRS-80 for me to realize that I needed hard copy. As a surgical intern, I didn't have 700 for a quality printer. But I did have 75 for a broken- down, used input-output IBM Selectric. Although the typewriter was in bad shape, it had the electromagnets and contacts for use with a computer. All I had to do was figure out how to interface the two. The only information I could find was Emerson...

Call Fafh

Load the HL register pair with the address of the first ASCII character to be converted. On return the DE register contains the binary equivalent. The maximum number which can be converted is 65529. This routine is located at 1E5AH. char to be converted CALL IE5AH call convert routine LD A,(DE) Acc. contains the binary value OUTSTR will output a string of characters from memory to the CRT. Load the HL register with the address of the first character....

Info

Inside the RF box, wire two DIN jacks in parallel, hooking them up to the RF modulator as in Fig. 2. A short DIN cable connects the computer to the RF box, the TRS-80's original monitor plugs into the box's other jack, and the RF output goes to an ordinary television. See Fig. 3. Picture and sound can now travel with me and my TRS-80. Speaking of the expansion box, I'm amazed that Radio Shack has let users suffer with a RESET button that locks up the computer when ah E I is connected....

Phices And Specifications Subject To Change Without Notice

Includes DBLDOS, a TRSDOS compatible double-density disk operating system. CONVERT utility, on DBLDOS minidiskette, converts files and programs from single- to double-density or double- to single-density. Plug-in installation No strapping. No trace cutting. Restore your Expansion Interface disk controller to original configuration by simply removing the DOUBLER and reinstalling the original disk controller chip. PERCOM DISCOUNT COUPON worth 20 toward The Purchase of a DOUBLER Coupon No. 80M103...

So Reviews

Gibbs He assumes the reader . has a fairly good understanding of Level II BASIC, although all his tests operate on a 4K machine. Blacksburg Continuing Education Series In TRS-80 Interfacing, Titus provides the reader with a practical knowledge of input output circuitry and its operations. It is a basic book that should be in the library of all hardware designers who wish to work with the TRS-80 system for input output control. The book is written for a general reader. Titus...