Microcode simulation

A project log for Kobold - retro TTL computer

A 16 bit computer with 20 address bits and video display, from just a few TTL and memory chips. Instructions resemble 68000 / PDP-11.

roelhroelh 05/26/2019 at 20:150 Comments

This weekend I simulated the microcode in Logisim (V2.7.1). A few things didn't work, so schematic changed a little. The files in the file section are updated.

Some things were added in microcode:

The microinstructions are simple, but a sequence of them will be quite capable. It will be possible to add the 'long' instruction type to our PDP-11 lookalike instructions, so 32 bit MOV, ADD (and more) can be handled !