( Requires KBD_MEM, KBD_PORT )
( gm -- pm, get pressed keys mask for group mask gm )
CODE _get
HL POP,
chkPS,
DI,
A 0xff LDri,
KBD_PORT OUTiA,
A L LDrr,
KBD_PORT INAi,
EI,
L A LDrr, HL PUSH,
;CODE