COSMAC ELF CLONE BUILT WITH PICS
Ted Rossin put together a modern day version of a COSMAC ELF retro computer using a PIC processor.
"The PIC is clocked with a 7.16 MHz crystal which is 4x the
rate of a standard Elf with Pixie chip. This gave me
32 PIC instructions per 1802 state cycle to get the job
done. I use the internal PLL to multiply the clock by
another 4 as the PIC needs 4 clocks per instruction.
For most 1802 instructions this was cake but some were quite
challenging as the PIC has to implement the instruction plus
keep TPA and TPB going as well as implement the normal 1802
bus cycles not to mention the need to respond to the mode
pins, DMA and interrupts."
http://www.tedrossin.net46.net/Electronics/RCA/RCA.html#ElfClone