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C > CASIO  > FX-700P   


The FX-700P is quite the same machine as the PB-100, but is a member of the more scientifically oriented FX product family. Consequentially, it is called "Programmable Calculator", as most FX family members.

It has 2 KB RAM, i.e. it was equipped with two HD61914 RAM chip instead of one like the PB-100, but no further RAM expansion was ever made available.
Moreover, the mathematical functions (SIN, COS, etc.) were assigned to the keyboard, by means of an additional function key. Apart from that, the hardware of the two machines is identical.

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The blue F key of the FX-700 presses a switch on the keyboard which was also present on the PB-100. It had become common among students to drill the PB-100 of the time to add this handcrafted F key and thus inherit the accelerated entry of the mathematical functions (SIN, COS, etc.).

Tuesday 12th April 2022
Bruno Chatard (Switzerland)

As Ivan says, the interior of the MK-85 has nothing in common with the Casio, using the KA1013VM1 processor, one of a family that grew out of the original DEC LSI-11 cpu clone. The PDP roots ran deep: it can be programmed in the DEC assembly language MACRO-11. Using an N-Queens benchmark, BASIC 10m45s, fast mode BASIC 2m, assembly 1.22s, fast mode assembly 0.22s.

Friday 21st January 2022
Carl Holmberg (USA)

Two corrections:
1. In Russian, MK stands for "microcomputer".
2. MK-85 has the body cloned from Casio but it''s absolutely different inside. MK-85 is 16-bit and it''s compatible (to a degree) with DEC PDP boxes. E.g. one of its variations was used for strong cryptography (to wire money transfers via unsafe public networks).

Original design of MK-85 (with misleading name MK-87) has nothing common with Casio:

Thursday 13rd August 2015
Ivan Mikhailov


TYPE  Pocket
YEAR  1982
BUILT IN LANGUAGE  Basic interpreter
KEYBOARD  QWERTY calculator type 54 keys with numeric keypad
SPEED  455 kHz ceramic resonator used as system clock
RAM  2 KB (1568 bytes for BASIC)
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
POWER SUPPLY  2 x CR-2032 lithium batteries
PERIPHERALS  FA-3 cassette interface
FP-12 mini thermal printer
PRICE  $200 (USA, Dec 1983) including FA-3 and FP-12

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