rx82 0.5.0

An emulator for the RX82 fantasy retro computer system.
Documentation 
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; countdown timer
    ld a, 0x06 ; = about 1 second at 4MHz
LOOP:
    ld cd, 0xFFFF ; inner loop
INNER:
    dec cd
    bne INNER
    dec a
    bne LOOP
    halt