=> R0 = mask of bits to change
R1 = new values of bits to change
<= R0 preserved
R1 = R0 AND entry value of R1
R2 = old value of retry word
R3 = new value of retry word
This call sets up the number of retries used by writing to the retry word. The format of the word is:
Byte Number of retries for
0 hard disc read/write sector
1 floppy disc read/write sector
2 floppy disc mount (per copy of the disc map)
3 verify after *Format, before sector is considered a defect
The new value is calculated as follows:
(old value AND NOT R0) EOR (R1 AND R0)
See PRM 2, page 284.
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