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=                                UKNC                                =
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                            Introduction
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UKNC () is a Soviet PDP-11-compatible educational micro computer,
aimed at teaching school informatics courses. It is also known as
Elektronika MS-0511. UKNC stands for Educational Computer by
Scientific Centre.


                              Hardware
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*Processor: KM1801VM2 1801 series CPU @ 8 MHz, 16 bit data bus, 17 bit
address bus
*Peripheral processor: KM1801VM2 @ 6.25 MHz
*CPU RAM: 64 KiB
*PPU RAM: 32 KiB
*ROM: 32 KiB
*Video RAM: 96 KiB (3 planes 32 KiB each, each 3-bit pixel had a bit
in each plane)
*Graphics: max  with 8 colors in one line (16 or 53 colors on whole
screen), it is possible to set an individual palette, resolution (80,
160, 320, or 640 dots per line) and memory address for each of 288
screen lines; no text mode.
*Keyboard: 88 keys (MS-7007), JCUKEN layout
*Built-in LAN controller
*Built-in controller for common or special tape-recorder with computer
control (to use for data storage, usually 5-inch FDD's were used)

One unique part of the design is the usage of a peripheral processing
unit (PPU). Management of peripheral devices (display, audio, and so
on) was offloaded to the PPU, which can also run user programs.


The computer was released in 3 sub-models: 0511, 0511.1, 0511.2.

The 0511.1 model, intended for home use, has a power supply for 220 V
AC, while others use 42 V AC.

The 0511.2 features new firmware with extended functionality and
changed the marking of the keyboard's gray keys, compared to the
initial version. There is no active cooling, and at least the 0511.2
variant tends to overheat and halt after several hours of operation.


                              Software
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*Operating system: RAFOS, FODOS (RT-11 clones), or RT-11SJ/FB
*LAN control program
*Programming languages:
**BASIC (Vilnius BASIC)
**Fortran
**Pascal
**Modula-2
**C
**Assembler
**Rapira
**E-practicum
**Logo
**Prolog
**Forth
**FOCAL


                              See also
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*DVK
*Elektronika BK-0010
*SM EVM


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