collapseos/blk/752

( Splits word into msb/lsb, lsb being on TOS )
: SPLITB
    256 /MOD SWAP
;
: PC H@ ORG @ - BIN( @ + ;
: A, C, ;
( dst8 src8 -- modrm )
: MODRMrr 0x7 AND 3 LSHIFT SWAP 0x7 AND OR 0xc0 OR ;