||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (November 2009) (Learn how and when to remove this template message)|
MK14 (foreground) with modern reproductions behind
|Also known as||MK14|
|Manufacturer||Science of Cambridge|
|CPU||National Semiconductor SC/MP (INS8060)|
|Memory||256 bytes of RAM (expandable to 640 bytes)|
|Display||8 or 9 red light-emitting diode (LED) seven segment display|
|Input||20 key keyboard|
It used a National Semiconductor SC/MP CPU (INS8060), 128 (expandable to 256) bytes of random access memory (RAM) which was directly expandable to 640 bytes on board and 2170 bytes total. It used an 8 or 9 red light-emitting diode (LED) seven segment display, there was also optional VDU supporting 32×16 text or 64×64 graphics. Input and output was a 20 key keyboard and reset switch, with an optional 128 bytes of RAM and 16 I/O lines available by adding an INS8154N RAM/IO chip. Cassette-based and PROM storage were optional extras, a sound card was not included but a design for one was provided.
The MK14 could address up to 64 KB of memory space by adding a few chips (the NADS address strobe indicated when the most significant 4 bits of address were available to be captured by an external latch); many pioneering home-brew computer magazines such as Personal Computer World, and Practical Electronics carried details of user modifications.