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Tandy Radio Shack
TRS 80 PC-4

The Tandy PC-4 Was a rebadged version of the Casio PB-100.
Apart from the brand/model plate, the design and features was identical to the original Casio model.

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Rich, I''m interested in the interface. What would you sell it for?

Thursday 14th March 2013

is there any value to these anymore? got computer, printer and cassette interface all in good condition.

Saturday 5th January 2013
Rich H (Ohio USA)

MK-85 and Casio (or this Tandy) looks like two coins because soviet engineers simply take the interface modules (screen and keyboard) from cheaper pocket computer (Casio PB-100) and placed over their own platform $ PDP-compatible 16-bit chipset. Result is strange $ big computer (MK-85 can work with very big numbers $ over to 10^4000) is closed in calculator''s cage with small screen and ugly keyboard. Add there lack of any interfaces to make a program backup (there are no tape recorder or printer ports in MK-85) and you can fully imagine this strange pocket computer. Programs are saved in 2K volatile memory divided to ten parts without any chance to make a hardcopy.
Many of MK-85 still work today like new. Think, what today''s pocket devices can still work over 20 (MK-85 manufactured up to 1991) or near 30 years like Casio?

Tuesday 29th November 2011
Edward (Russia)


MANUFACTURER  Tandy Radio Shack
TYPE  Pocket
YEAR  1982
BUILT IN LANGUAGE  Basic interpreter
KEYBOARD  53 keys with numeric keypad
SPEED  455 kHz ceramic resonator used as system clock
RAM  1 KB (544 bytes for Basic programs) up to 2 KB
ROM  12 KB
TEXT MODES  1 line x 12 chars plus a 4 digit seven segment display part
COLORS  Monochrome LCD
SIZE / WEIGHT  165 (W) x 71 (D) x 10 (H) mm / 116 g (with batteries)
I/O PORTS  12-pin expansion port for printer and cassette interface
11-pin internal slot for memory module
POWER SUPPLY  2 x CR-2032 lithium batteries
PERIPHERALS  1 kB RAM PACK, cassette interface, mini thermal printer (from Tandy or Casio)
PRICE  Unknown

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