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pcat: read sector from floppy

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This commit is contained in:
Virgil Dupras 2020-06-13 13:29:04 -04:00
parent b037c86598
commit e17f2e6907
1 changed files with 5 additions and 4 deletions
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@ -1,14 +1,15 @@
H@ ORG ! 0x7c00 BIN( ! ( BIOS loads boot bin at 0x7c00 ) H@ ORG ! 0x7c00 BIN( ! ( BIOS loads boot bin at 0x7c00 )
JMP8, L1 FWR8 ( start ) JMP8, L1 FWR8 ( start )
ORG @ 0x25 + HERE ! ( bypass BPB ) ORG @ 0x25 + HERE ! ( bypass BPB )
L2 BSET ( msg ) ," Hello, World!" 0 A,
L1 FSET ( start ) L1 FSET ( start )
CLI, CLD, AX AX XORxx, DS AX MOVsx, STI, CLI, CLD, AX AX XORxx, DS AX MOVsx, ES AX MOVsx, STI,
AH 0 MOVri, AL 2 MOVri, ( 80x25 BW video mode ) 0x10 INT, AH 2 MOVri, DX 0 MOVrI, CH 0 MOVri, CL 2 MOVri, AL 1 MOVri,
SI L2 @ ( msg ) MOVrI, AH 0x0e MOVri, ( print char ) BX 0x8000 MOVrI, 0x13 INT, ( read 2nd sector of boot floppy )
SI 0x8000 MOVrI, AH 0x0e MOVri, ( print char )
L1 BSET ( loop ) LODSB, AL AL ORrr, ( end of str? ) L1 BSET ( loop ) LODSB, AL AL ORrr, ( end of str? )
JZ, L2 FWR8 ( next ) 0x10 INT, ( print char ) JZ, L2 FWR8 ( next ) 0x10 INT, ( print char )
JMP8, L1 ( loop ) BWR JMP8, L1 ( loop ) BWR
L2 FSET ( next ) AH 0 MOVri, 0x16 INT, ( read kbd ) L2 FSET ( next ) AH 0 MOVri, 0x16 INT, ( read kbd )
AH 0x0e MOVri, 0x10 INT, ( spit read char ) HLT, ( done ) AH 0x0e MOVri, 0x10 INT, ( spit read char ) HLT, ( done )
ORG @ 0x1fe + HERE ! 0x55 A, 0xaa A, ORG @ 0x1fe + HERE ! 0x55 A, 0xaa A,
," Hello from 2nd sector of boot floppy!" 0 A,