( current position in INBUF )
: IN> 0x30 RAM+ ;
( points to INBUF )
: IN( 0x32 RAM+ @ ;
( points to INBUF's end )
: IN) 0x40 ( buffer size ) IN( + ;

( flush input buffer )
( set IN> to IN( and set IN> @ to null )
: (infl) 0 IN( DUP IN> ! ! ;