: RDLNMEM+ 0x57 RAM+ @ + ;
( current position in INBUF )
: IN> 0 RDLNMEM+ ;
( points to INBUF )
: IN( 2 RDLNMEM+ ;
( points to INBUF's end )
: IN) 0x40 ( buffer size ) 2+ RDLNMEM+ ;

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