DSKBYTR

         This register is the Disk-Microrocessor data buffer.
         Data from the disk (in read mode) is leaded into this
         register one byte at a time, and bit 15 (DSKBYT) is set true.


        +-------+----------+--------------------------------------------------+
        | BIT#  | FUNCTION | DESCRIPTION                                      |
        +-------+----------+--------------------------------------------------+
        | 15    | DSKBYT   | Disk byte ready (reset on read)                  |
        | 14    | DMAON    | DMAEN (DSKLEN) & DMAEN (DMACON) & DSKEN (DMACON) |
        | 13    | DISKWRITE| Mirror of bit 14 (WRITE) in DSKLEN               |
        | 12    | WORDEQUAL| This bit true only while DSKSYNC register        |
        |       |          | equals the data from disk                        |
        | 11-08 | 0        | Not used                                         |
        | 07-00 | DATA     | Disk byte data                                   |
        +-------+----------+--------------------------------------------------+