56 lines
1.5 KiB
Forth
56 lines
1.5 KiB
Forth
0xff00 CONSTANT RS_ADDR
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0xfffa CONSTANT PS_ADDR
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RS_ADDR 0x80 - CONSTANT RAMSTART
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750 LOAD ( 8086 asm )
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262 LOAD ( xcomp )
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270 LOAD ( xcomp overrides )
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812 829 LOADR
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353 LOAD ( xcomp core low )
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CODE (emit) 1 chkPS,
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AX POPx, AH 0x0e MOVri, ( print char ) 0x10 INT,
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;CODE
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CODE (key)
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AH AH XORrr, 0x16 INT, AH AH XORrr, AX PUSHx,
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;CODE
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CODE 13H08H ( driveno -- cx )
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DI POPx, DX PUSHx, ( protect ) DX DI MOVxx, AX 0x800 MOVxI,
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DI DI XORxx, ES DI MOVsx,
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0x13 INT, DX POPx, ( unprotect ) CX PUSHx,
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DI 0x800 MOVxI, ES DI MOVsx,
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;CODE
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CODE 13H ( ax bx cx dx -- ax bx cx dx )
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SI POPx, ( DX ) CX POPx, BX POPx, AX POPx,
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DX PUSHx, ( protect ) DX SI MOVxx, DI DI XORxx,
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0x13 INT, SI DX MOVxx, DX POPx, ( unprotect )
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AX PUSHx, BX PUSHx, CX PUSHx, SI PUSHx,
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;CODE
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: FDSPT 0x70 RAM+ ;
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: _ ( dest secno )
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( AH=read sectors, AL=1 sector, BX=dest,
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CH=trackno CL=secno DH=head. )
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0x0201 ROT ROT ( AX BX sec )
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FDSPT @ /MOD ( AX BX sec trk )
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2 /MOD ( AX BX sec head trk )
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8 LSHIFT ROT OR 1+ ( AX BX head CX )
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SWAP 8 LSHIFT ( AX BX CX DX )
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13H 2DROP 2DROP
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;
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: FD@
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2 * 16 + ( blkfs starts at sector 16 )
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BLK( OVER _ BLK( 0x200 + SWAP 1+ _ ;
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: FD! DROP ;
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: FD$
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( get number of sectors per track with command 08H. )
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0 13H08H 0x3f AND FDSPT !
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;
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380 LOAD ( xcomp core high )
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(entry) _
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( Update LATEST )
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PC ORG @ 8 + !
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," BLK$ FD$ "
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," ' FD@ BLK@* ! "
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," ' FD! BLK!* ! "
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EOT,
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ORG @ 256 /MOD 2 PC! 2 PC!
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H@ 256 /MOD 2 PC! 2 PC!
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