SWITCH command [MS-DOS, NEC PC98]
To configure the Memory Switches in MS-DOS, use SWITCH command. The DIP Switch 2-5 must be on if you don't want to initialize it every boot. (PC-9801DA and later models have the System Setup Menu instead of real switches.)
MS-DOS 5.0A-H
| Menu | Sub Menu or Choices | Effective | |||
| Boot | BASIC | DOS | |||
| RS232C-0 | ボーレイト Baud Rate |
75, 150, 300, 600, 1200, 2400, 4800, 9600, 19200 Note that 19200 bps is not supported on 9801 models. |
- | X | X |
| キャラクタ長 (Character Length) |
7ビット, 8ビット (Bit form: 7 bits, 8 bits) |
- | X | X | |
| パリティチェック (Parity Check) |
パリティ無, 奇数ビット, 偶数ビット (No Parity, Odd Parity, Even Parity) |
- | X | X | |
| ストップビット数 (Number of stop bits) |
1ビット, 2ビット (1 bit, 2 bits) |
- | X | X | |
| Xパラメータ (X-parameter) |
無, 有 Flow control by XON/XOFF codes: Disabled, Enabled. |
- | X | X | |
| 設定終了 (Exit) |
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| プリンタ (Printer) |
プリンタタイプ (Type of Printer) |
16-dot printer, 24-dot printer | - | X | X |
| ANK/漢字 (Ratio of ANK / Kanji) |
1/2, 2/3 Width ratio of full-width form and half-width form. |
- | X | X | |
| 設定終了 (Exit) |
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| メモリサイズ (KB) (Memory Size) |
128K, 256K, 384K, 512K, 640K, 768K Note that '768K' is only available in High-reso mode of PC-H98 series. |
X | X | X | |
| ディスプレイ表示属性 (Display Attribute) |
白, 緑 (White, Green) |
X | X | X | |
| 数値データプロセッサ (Numeric Data Processor) |
接続の有無 (Is it connected?) |
有, 無 NDP for V30 processor is Connected or not. |
- | X | App |
| クロック周波数 (Clock Frequency) |
5MHz, 8MHz, 10MHz | - | X | App | |
| 設定終了 (Exit) |
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| BOOT装置 (Boot Device) |
標準, 1MFD, 640KBFD, 固定ディスク#1, 固定ディスク#2, SCSI固定ディスク 光ディスク (Default, 1MBFD, 640KBFD, Fixed Disk #1, Fixed Disk #2, SCSI Fixed Disk, MO) |
X | - | - | |
| 数値データプロセッサ (Numeric Data Processor 2) |
有, 無 NDP for 80286, 386 or 486 processor is Connected or not. |
- | X | App | |
| 設定終了 (Exit) |
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What's the Numeric Data Processor
Historically, floating point arithmetic operations were provided by an optional math coprocessor (NEC called it Numeric Data Processor). Some 9801 machines have 80x86 and V30 (8086 compatible) processors to support old softwares using V30's unique instructions. Each processors must be used with corresponding coprocessors. Also, you may have to configure the jumper switch on the CPU board. It's depending on models.
| CPU | NDP | NEC Options |
|---|---|---|
| 8086, V30 | 8087 | PC-9801-33, PC-9801CV-01, PC-9801-62 |
| 80286 | 80287 | PC-9801-63 |
| 386 | 387 | PC-9801-54, PC-98RL-03 |
| 386SX | 387SX | PC-9801LS-03, PC-9801-64, PC-9801-66 |
