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TRS-80

  • Model 1 released 1977 Z80 at 1.77MHz

  • Model 3 released 1980

  • CPU Z80 at 2MHz

  • RAM 16kB or 48kB

  • ROM 14kB

  • Text 64x16 (black & white)

  • Graphics 128x48 (black & white)

  • 1 channel sound

  • Tape and 5.25" floppy discs

    The TRS-80 range competed with the Commodore PET and the Apple II. The Model 1 came in two versions, the Level 1 (4k RAM and limited version of Basic) and the Level 2 (16k with extended Basic). Although mainly used for business, many machines were used as home computers.

 


TRS-80 Pocket Computer -PC1

  • 1424 bytes of program memory

  • 26 data memories (more can be used at the expense of program memory)

  • 24 digit alphanumeric LCD

  • Programmable  in Basic

  • Optional interface for ticket printer and tape

A rebadged Sharp PC1211.  The data memories could be referred to as "A" to "Z", or as "A(1)" to "A(26)".  This can lead to some confusion.  A program like:

10 FOR I=1 TO 10

20 A(I)=1

30 NEXT I

Will loop forever, as "A(9)" is the same as "I".  So, "I" gets reset to 1 whenever the it get to 9..

 
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Copyright (C) 1999-2002 by Geoff Macdonald

Last updated 29/08/2002