Jonathan カードの解析（1）
今年 4 月に、MicroTrends 社の Jonathan という、Apple IIe 用のカードを手に入れました。68000 が載っていますが、カードのみでソフトもなく、動くかどうかもわからないもので、ROM データを少し調べただけで、放置していました。最近になって、動くバージョンを持っている人と連絡が取れたので、解析を再開してみます。
このカード、Philips の初代 CD-ROM ドライブ CM-100 を Apple II に接続するもので、制御に OS-9 を使っています。百科事典などのソフトが 5台の IIe で共有できたようです。
2 枚のカードで構成され、メインのカードには、10 MHz の 68000 CPU、64K の ROM が二つ、20 MHz クロック、4 列の 30 ピンソケット、いくつかの PAL があります。サブのカードには、MC68681 DUART と 64KB SRAM HM6264 が四つ載っています。サブカードからは、15 ピンと 25 ピンの DSUB コネクタが出ています。CM-100 接続用とシリアル通信用と思われます。
ROM の中身を見てみます。16 KB 領域がありますが、先頭 3KB 程が使われているようです。
先頭 1KB ($000-3FF) は、68000 の割り込みベクター、$400 からプログラムが入っています。コピーライトと、いくつかのメッセージが読めます。
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00000a20 20 50 41 53 53 45 44 0d 0a 00 00 00 52 41 4d 20 | PASSED.....RAM |
00000a30 54 45 53 54 20 2d 20 46 41 49 4c 45 44 0d 0a 00 |TEST - FAILED...|
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00000c50 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000c60 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
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