This mini forum is intended to provide a simple means of discussion about the Casio  FX-700P computer. If you want to share your own experience or memories, or add relevant information about this system: post a message!

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.).

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.

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: http://www.computerra.ru/upload/apismenny/elektronika-mk-87-1.jpg

This was cloned down to the buttons by the Soviets as the Elektronika MK-85....probably had different guts (the Soviets had round microchips for calculators for some reason.)

"MK" stands for "mark." Elektronika was a stock name for electronic gadgets made in the USSR that weren''t radios.