( 0000 KKKK dddd KKKK )
: OPRdK CREATE C, DOES> C@ ( rd K op )
    OVER _r256c 0xf0 AND 4 RSHIFT OR ( rd K op' )
    ROT _r16+c 4 LSHIFT ROT 0x0f AND OR ( op' rdK ) A, A, ;
0x70 OPRdK ANDI,   0x30 OPRdK CPI,     0xe0 OPRdK LDI,
0x60 OPRdK ORI,    0x40 OPRdK SBCI,    0x60 OPRdK SBR,
0x50 OPRdK SUBI,

( 0000 0000 AAAA Abbb )
: OPAb CREATE C, DOES> C@ ( A b op )
    ROT _r32c 3 LSHIFT ROT _r8c OR A, A, ;
0x98 OPAb CBI,     0x9a OPAb SBI,      0x99 OPAb SBIC,
0x9b OPAb SBIS,
