マイコン独立大作戦
ＳＤカードインターフェースの製作
～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～
ＷｉｎｄｏｗｓパソコンにＵＳＢ接続して使う現行方式はそれなりに便利ではありますが、ときとしてＷｉｎｄｏｗｓ
のしがらみから開放されて、小さいながらも独立した一個のパソコンとして機能したいと思うこともあります。
独立大作戦の作戦その１はＣＲＴインターフェースボードの製作です。
作戦その２はキーボードインターフェースです。
そして作戦その３は、ＳＤカードインターフェースです。
～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～
［第３０回］
●ＦＡＴ３２システム（２） ファイルシステム情報セクタとＢＰＢのバックアップセクタ
前回のＢＰＢ（Ｂｉｏｓ Ｐａｒａｍｅｔｅｒ Ｂｌｏｃｋ）の解析のなかで、ファイルシステム情報セクタの番号が０００１になっているのですが、確認したところセクタ№１ではなくてセクタ№２００１にありました、と書きました。
また同様に、ＢＰＢのバックアップセクタの番号が０００６になっているのですが、確認したところセクタ№６ではなくてセクタ№２００６にありました、と書きました。
今回は参考までにその確認を行なっているログを示します。
セクタの読み込みは前回までのプログラムをそのまま使います。
先頭に初期化の部分が表示されますが、その部分は冗長なのでログのその部分はカットして示します。
まずは念のためにセクタ№１を読んでみました。
logfile nd80zlog\12072244.txt open ＮＤ８０ＺⅢに接続しました 0001 0000 - z 1000 00C3 - *** nd80z3 basic **** ndwr2h.bin loaded,from E23F to E535 >cm 8103 8103 00- 8104 00- 8105 20-00 8106 00-01 8107 00- >jp 8100 [00000001] 8800 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8810 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8820 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8830 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8840 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8850 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8860 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8870 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8880 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8890 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88A0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88B0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88C0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88D0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88E0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88F0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8900 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8910 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8920 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8930 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8940 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8950 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8960 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8970 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8980 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8990 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89A0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89B0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89C0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89D0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89E0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89F0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ |
セクタ№１には何も書かれていません。
次に念のためにセクタ№６を読んでみました。
>cm 8103 8103 00- 8104 00- 8105 00- 8106 01-06 8107 00- >jp 8100 [00000006] 8800 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8810 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8820 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8830 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8840 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8850 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8860 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8870 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8880 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8890 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88A0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88B0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88C0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88D0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88E0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88F0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8900 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8910 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8920 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8930 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8940 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8950 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8960 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8970 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8980 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8990 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89A0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89B0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89C0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89D0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89E0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89F0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ |
セクタ№６にも何も書かれていません。
今度はセクタ№２００１を読んでみました。
>cm 8103 8103 00- 8104 00- 8105 00-20 8106 06-01 8107 00- >jp 8100 [00002001] 8800 52 52 61 41 00 00 00 00-00 00 00 00 00 00 00 00 RRaA............ 8810 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8820 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8830 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8840 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8850 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8860 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8870 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8880 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8890 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88A0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88B0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88C0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88D0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88E0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 88F0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8900 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8910 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8920 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8930 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8940 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8950 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8960 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8970 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8980 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 8990 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89A0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89B0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89C0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89D0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 89E0 00 00 00 00 72 72 41 61-3B B4 03 00 07 00 00 00 ....rrAa;ｴ...... 89F0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 55 AA ..............Uｪ |
ファイルシステム情報セクタの先頭４バイト（０００～００３）には識別情報として５２ ５２ ６１ ４１が書かれることになっています。
確かにそのようになっています。
また０１Ｅ４～０１Ｅ７には同じく識別情報として７２ ７２ ４１ ６１が書かれることになっています。
ここもそのようになっています。
そして最後の２バイトには識別情報の５５ ＡＡが書かれています。
思った通りファイルシステム情報セクタはセクタ№２００１にありました。
今度はセクタ№２００６を読んでみました。
>cm 8103
8103 00-
8104 00-
8105 20-
8106 01-06
8107 00-
>jp 8100
[00002006]
8800 EB 58 90 4D 53 44 4F 53-35 2E 30 00 02 40 2E 11 .X.MSDOS5.0..@..
8810 02 00 00 00 00 F8 00 00-3F 00 FF 00 00 20 00 00 ........?.... ..
8820 00 30 ED 00 69 07 00 00-00 00 00 00 02 00 00 00 .0..i...........
8830 01 00 06 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
8840 80 00 29 C1 50 73 6E 4E-4F 20 4E 41 4D 45 20 20 ..)ﾁPsnNO NAME
8850 20 20 46 41 54 33 32 20-20 20 33 C9 8E D1 BC F4 FAT32 3ﾉ.ﾑｼ.
8860 7B 8E C1 8E D9 BD 00 7C-88 4E 02 8A 56 40 B4 41 {.ﾁ.ﾙｽ.|.N..V@ｴA
8870 BB AA 55 CD 13 72 10 81-FB 55 AA 75 0A F6 C1 01 ｻｪUﾍ.r...Uｪu..ﾁ.
8880 74 05 FE 46 02 EB 2D 8A-56 40 B4 08 CD 13 73 05 t..F..-.V@ｴ.ﾍ.s.
8890 B9 FF FF 8A F1 66 0F B6-C6 40 66 0F B6 D1 80 E2 ｹ....f.ｶﾆ@f.ｶﾑ..
88A0 3F F7 E2 86 CD C0 ED 06-41 66 0F B7 C9 66 F7 E1 ?...ﾍﾀ..Af.ｷﾉf..
88B0 66 89 46 F8 83 7E 16 00-75 38 83 7E 2A 00 77 32 f.F..~..u8.~*.w2
88C0 66 8B 46 1C 66 83 C0 0C-BB 00 80 B9 01 00 E8 2B f.F.f.ﾀ.ｻ..ｹ...+
88D0 00 E9 2C 03 A0 FA 7D B4-7D 8B F0 AC 84 C0 74 17 ..,..}ｴ}..ｬ.ﾀt.
88E0 3C FF 74 09 B4 0E BB 07-00 CD 10 EB EE A0 FB 7D <.t.ｴ.ｻ..ﾍ....}
88F0 EB E5 A0 F9 7D EB E0 98-CD 16 CD 19 66 60 80 7E ...}...ﾍ.ﾍ.f`.~
8900 02 00 0F 84 20 00 66 6A-00 66 50 06 53 66 68 10 .... .fj.fP.Sfh.
8910 00 01 00 B4 42 8A 56 40-8B F4 CD 13 66 58 66 58 ...ｴB.V@..ﾍ.fXfX
8920 66 58 66 58 EB 33 66 3B-46 F8 72 03 F9 EB 2A 66 fXfX.3f;F.r...*f
8930 33 D2 66 0F B7 4E 18 66-F7 F1 FE C2 8A CA 66 8B 3ﾒf.ｷN.f...ﾂ.ﾊf.
8940 D0 66 C1 EA 10 F7 76 1A-86 D6 8A 56 40 8A E8 C0 ﾐfﾁ...v..ﾖ.V@..ﾀ
8950 E4 06 0A CC B8 01 02 CD-13 66 61 0F 82 75 FF 81 ...ﾌｸ..ﾍ.fa..u..
8960 C3 00 02 66 40 49 75 94-C3 42 4F 4F 54 4D 47 52 ﾃ..f@Iu.ﾃBOOTMGR
8970 20 20 20 20 00 00 00 00-00 00 00 00 00 00 00 00 ............
8980 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
8990 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
89A0 00 00 00 00 00 00 00 00-00 00 00 00 0D 0A 52 65 ..............Re
89B0 6D 6F 76 65 20 64 69 73-6B 73 20 6F 72 20 6F 74 move disks or ot
89C0 68 65 72 20 6D 65 64 69-61 2E FF 0D 0A 44 69 73 her media....Dis
89D0 6B 20 65 72 72 6F 72 FF-0D 0A 50 72 65 73 73 20 k error...Press
89E0 61 6E 79 20 6B 65 79 20-74 6F 20 72 65 73 74 61 any key to resta
89F0 72 74 0D 0A 00 00 00 00-00 AC CB D8 00 00 55 AA rt.......ｬﾋﾘ..Uｪ
|
おお。
思った通りＢＰＢのバックアップセクタはセクタ№２００６にありました。
ＳＤカードインターフェースの製作［第３０回］
２０１６．１２．１０ｕｐｌｏａｄ
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