diff options
| -rw-r--r-- | boot.subx | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/boot.subx b/boot.subx index bae5b553..5cf7ee7d 100644 --- a/boot.subx +++ b/boot.subx @@ -64,12 +64,12 @@ } # load remaining sectors from first two tracks of disk into addresses [0x7e00, 0x17800) - b4/copy-to-ah 2/imm8 # read sectors from disk + b4/copy-to-ah 2/imm8/read-drive # dl comes conveniently initialized at boot time with the index of the device being booted - b5/copy-to-ch 0/imm8 # cylinder 0 - b6/copy-to-dh 0/imm8 # head 0 - b1/copy-to-cl 2/imm8 # second sector, 1-based - b0/copy-to-al 0x7d/imm8 # number of sectors to read = 2*63 - 1 = 125 + b5/copy-to-ch 0/imm8/cylinder + b6/copy-to-dh 0/imm8/head + b1/copy-to-cl 2/imm8/sector # 1-based + b0/copy-to-al 0x7d/imm8/num-sectors # 2*63 - 1 = 125 # address to write sectors to = es:bx = 0x7e00, contiguous with boot segment bb/copy-to-bx 0/imm16 8e/->seg 3/mod/direct 3/rm32/bx 0/r32/es @@ -78,12 +78,12 @@ 0f 82/jump-if-carry disk_error/disp16 # load two more tracks of disk into addresses [0x17800, 0x27400) - b4/copy-to-ah 2/imm8 # read sectors from disk + b4/copy-to-ah 2/imm8/read-drive # dl comes conveniently initialized at boot time with the index of the device being booted - b5/copy-to-ch 0/imm8 # cylinder - b6/copy-to-dh 2/imm8 # head - b1/copy-to-cl 1/imm8 # sector, 1-based - b0/copy-to-al 0x7e/imm8 # number of sectors to read = 2*63 = 126 + b5/copy-to-ch 0/imm8/cylinder + b6/copy-to-dh 2/imm8/head + b1/copy-to-cl 1/imm8/sector # 1-based + b0/copy-to-al 0x7e/imm8/num-sectors # 2*63 = 126 # address to write sectors to = es:bx = 0x17800, contiguous with boot segment bb/copy-to-bx 0x1780/imm16 8e/->seg 3/mod/direct 3/rm32/bx 0/r32/es @@ -92,12 +92,12 @@ 0f 82/jump-if-carry disk_error/disp16 # load two more tracks of disk into addresses [0x27400, 0x37000) - b4/copy-to-ah 2/imm8 # read sectors from disk + b4/copy-to-ah 2/imm8/read-drive # dl comes conveniently initialized at boot time with the index of the device being booted - b5/copy-to-ch 0/imm8 # cylinder - b6/copy-to-dh 4/imm8 # head - b1/copy-to-cl 1/imm8 # sector, 1-based - b0/copy-to-al 0x7e/imm8 # number of sectors to read = 2*63 = 126 + b5/copy-to-ch 0/imm8/cylinder + b6/copy-to-dh 4/imm8/head + b1/copy-to-cl 1/imm8/sector # 1-based + b0/copy-to-al 0x7e/imm8/num-sectors # 2*63 = 126 # address to write sectors to = es:bx = 0x27400, contiguous with boot segment bb/copy-to-bx 0x2740/imm16 8e/->seg 3/mod/direct 3/rm32/bx 0/r32/es |