First post, by holoprox
I want to properly add a numeric coprocessor in 1 of my 286-es.
1-st candidate will be an YANG-AN YA-1 (written on the back)
For now I added 1mb ram on top of the 1 already on the board, socketed the OSC1 (changed it to 36 Mhz from a donor video card) changed the CPU to 20 Mhz HARRIS (now running at 18.02 Mhz)
Added socket for OSC3 (next to NPU socket)
Motherboard has many factory missing components like RAM sockets, caps, resistor arrays, jumper headers...
Can somebody help me with the uneasy (at least in my eyes) task of adding an NPU?
50+ retro computers on board!