Welcome to December - 31 days of leisure and struggling to find a challenging brain-expanding task.
This is an overspill from the anycpu.org site, One Page Computing, OPC, and a challenge for anyone who wants to hack with minimal hardware.
The smallest Lattice ICE40 FPGA device has just 384 Logic Elements and costs about $1.20
The challenge is simple - devise a CPU that fits into 384 logic elements and communicates with serial memory.
Bit serial architecture will save a lot on logic - but with only 384 LE’s what architecture offers the best bang for buck?