Memory corruption and crash on buggy code
SDCC : mcs51/z80/z180/r2k/r3ka/gbz80/tlcs90/ds390/pic16/pic14/TININative/ds400/hc08/s08/stm8...
Z80: bogus right shift warning when object being shifted is 0
FreeDOS boot loader fails on Dell Dimension XPS D233 (Intel AL440LX)
IRQ handling is broken and causes random obscure crashes (with patch)
Present in both 9218 and 9165
Z80 bizarre miscompilation of (foo = bar)->field