( Requires KBD_MEM, KBD_PORT )
( gm -- pm, get pressed keys mask for group mask gm )
CODE _get
HL POPqq,
chkPS,
DI,
A 0xff LDrn,
KBD_PORT OUTnA,
A L LDrr,
KBD_PORT INAn,
EI,
L A LDrr, HL PUSHqq,
;CODE