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IBM System 34 double density format

354 bytes added, 18:40, 28 July 2018
Created page with "The IBM System 34 double density format is a structure used by NEC765 compatible disc controllers when writing in MFM mode. The data has this form: The track starts with thi..."
The IBM System 34 double density format is a structure used by NEC765 compatible disc controllers when writing in MFM mode.

The data has this form:

The track starts with this:

Gap 0 (80 bytes of data 4E)
Sync (12 bytes of 0)
Index mark IDAM which contains 3 bytes of C2 (this has a missing clock) followed by 1 byte FC.
Gap 1 (50 bytes of data 4e)
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