collapseos/recipes/trs80/blk/605

CODE @RDSEC ( drv cylsec addr -- f ) EXX, ( protect BC )
    HL POP,
    DE POP,
    BC POP,
    chkPS,
    A 0x31 LDri, ( @RDSEC )
    0x28 RST,
    PUSHZ,
EXX, ( unprotect BC ) ;CODE