A |
COMMON COMMAND SET AND DISK OPERATION
ATTRIBUTE FLAGS
| MEDIA | ALL SECTORS | 500K BITS/ | MFM |
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| TYPE | SAME BIT 7 | SEC BIT 3 | BIT 0 | NOTES | |
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12 | 0 | 0 | 1 | 5 ¼ in., | ||
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| FM/MFM | |
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| (VERSAdos | |
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| double | |
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| density) | |
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| 2. | The block length is taken from the attach | |||
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| packet, byte offset $1C, bytes per block. | |||
The remaining 32 bytes that are transferred during the DATA OUT phase for the mode select command are the page 5 header and parameters. The header consists of the first two bytes listed below, the parameters are the remaining bytes.
Mode Select Parameter List: Page 5 Parameters
| BYTE OFFSET | VALUE | COMMENTS | |
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0 | 5 | Page code | ||
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1 | 1E | Page length | ||
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2 | (Note 1) | Transfer rate (MSB) | ||
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3 | (Note 1) | Transfer rate (LSB) | ||
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4 | (Note 2) | Number of heads | ||
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5 | (Note 3) | Sectors per track | ||
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6 | (Note 4) | Bytes per sector (MSB) | ||
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7 | (Note 4) | Bytes per sector (LSB) | ||
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8 | (Note 5) | Number of cylinders (MSB) | ||
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9 | (Note 5) | Number of cylinders (LSB) | ||
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| A | (Note 6) | Starting cylinder - write precomp | |
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| (MSB) | |
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| B | (Note 6) | Starting cylinder - write precomp | |
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| (LSB) | |
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