MERCIA has a four bit instruction code, as well in the 14 basic instructions as the 16 extended instructions. At this moment there are 28 instructions defined.
May 2016, Naarden The Netherlands, Jeroen Brinkman
10 bit word
16 bytes I/O memory
496 bytes ROM
512 bytes RAM
16 function ALU
96*40 bit microcode ROM
4,5m wide & 1,42m high
for the painting of all the woodwork and panels.
Frans den Boer
for his never ending help with PCB designs and mechanics.
for his suggestions concerning ALU, architecture and instruction speed.
for his RAM design.