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collapseos/recipes/pcat/blk/607
Virgil Dupras 5a77b80d3d emul/8086/pcat: fix broken int13h logic
I had forgotten that heads index increment before track index.
2020-10-25 12:21:44 -04:00

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: _ ( AX BX sec )
( AH=read sectors, AL=1 sector, BX=dest,
CH=trackno CL=secno DH=head DL=drive )
FDSPT C@ /MOD ( AX BX sec trk )
FDHEADS C@ /MOD ( AX BX sec head trk )
8 LSHIFT ROT OR 1+ ( AX BX head CX )
SWAP 8 LSHIFT 0x03 C@ ( boot drive ) OR ( AX BX CX DX )
13H 2DROP 2DROP
;