collapseos/recipes/trs80/blk/605

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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