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- X3T9.2/89-023
- January 14, 1989
-
-
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- Mr. John Lohmeyer
- Chairman X3T9.2
- NCR MS21
- 3718 N. Rock Road
- Wichita
- KS 67226
-
-
- Dear John,
-
- Following is the text of the changes to ESDI to incorporate the proposal by
- Hitachi America to offset sector location with synchronized spindles.
-
- | 7.18.3 Synchronized Sector Offset
- |
- | When set to a value other than zero, the slave drive shall offset its
- | synchronized position by the number specified e.g. if set to 64, the
- | slave drive shall offset its position by one quarter rotation beyond that
- | of the master.
-
- TABLE 30: SET CONFIGURATION SOFT SWITCH PARAMETER BITS
- =======================================================================
- +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
- |15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | P |
- +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
- | CMD Function | Switch No | Switch Parameter |
- +---------------+---------------+-----------------------------------+
- | 1 1 1 0 | / / / /
- / / / /
- | | 1 1 0 0 | Set Synchronized Drive |
- | | | x'00' = Slave |
- | | | x'01' = Master |
- | | 1 1 0 1 | Notched Drive Zone Number |
- | | | 1 1 1 0 | Synchronized Sector Offset |
- | | 1 1 1 1 | Reserved = 0 |
- +---------------+ / / / /
- / / / /
- ==========================================================================
-
- Yours sincerely,
-
-
-
-
- I. Dal Allan
-