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PC87338 Datenblatt(PDF) 98 Page - National Semiconductor (TI) |
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PC87338 Datenblatt(HTML) 98 Page - National Semiconductor (TI) |
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98 / 221 page ![]() 98 www.national.com TABLE 46. Typical Gap Values Drive Type and Data Transfer Rate Bytes in Data Field (decimal) Bytes-Per-Sector Code (hex) End of Track (EOT) Sector # (hex) Bytes in Gap 2 a (hex) a. Gap 2 is specified in the command phase of read, write, scan, and verify commands. Although this is the rec- ommended value, the FDC ignores this byte in read, write, scan and verify commands. Bytes in Gap 3 b (hex) b. Gap 3 is the suggested value for use in the FORMAT TRACK command. This is the programmable Gap 3 illus- trated in Figure 58. 125 Kbps FM 128 00 12 07 09 128 00 10 10 19 256 01 08 18 30 512 02 04 46 87 1024 03 02 C8 FF 2048 04 01 C8 FF 250 Kbps MFM 256 01 12 0A 0C 256 01 10 20 32 512 02 08 2A 50 512 02 09 2A 50 1024 03 04 80 F0 2048 04 02 C8 FF 4096 05 01 C8 FF 250 Kbps FM 128 00 1A 07 1B 256 01 0F 0E 2A 512 02 08 1B 3A 1024 03 04 47 8A 2048 04 02 C8 FF 4096 05 01 C8 FF 500 Kbps MFM 256 01 1A 0E 36 512 02 0F 1B 54 512 02 12 1B 6C 1024 03 08 35 74 2048 04 04 99 FF 4096 05 02 C8 FF 8192 06 01 C8 FF |
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