collapseos/blk/499

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: _err LIT" FDerr" ERR ;
: _cylsec ( sec -- cs, return sector/cylinder for given secid )
( 4 256b sectors per block, 10 sec per cyl, 40 cyl max )
10 /MOD ( sec cyl )
DUP 39 > IF _err THEN
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8 LSHIFT + ( cylsec )
;
: FD@! ( wref blk -- )
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1 @DCSTAT NOT IF _err THEN
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2 LSHIFT ( 4 * -- wr sec )
4 0 DO ( wr sec )
DUP I + _cylsec ( wr sec cs )
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I 8 LSHIFT BLK( + ( wr sec cs addr )
1 ROT ROT ( wr sec drv cs addr )
4 PICK EXECUTE NOT IF _err THEN
LOOP 2DROP ;