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 $1C00:   Data Port B (SYNC, Motors, Bit Rates, LED)

   +----------+---------------------------------------------------+
   | Bit  7   |   0 = SYNC found                                  |
   | Bits 6-5 |   Bit rates (*):                                  |
   |          |     00 = 250000 Bit/s    01 = 266667 Bit/s        |
   |          |     10 = 285714 Bit/s    11 = 307692 Bit/s        |
   | Bit  4   |   Write Protect Sense: 1 = On                     |
   | Bit  3   |   Drive LED: 1 = On                               |
   | Bit  2   |   Drive Motor: 1 = On                             |
   | Bit  1-0 |   Step motor for head movement:                   |
   |          |     Sequence 00/01/10/11/00... moves inwards      |
   |          |     Sequence 00/11/10/01/00... moves outwards     |
   +----------+---------------------------------------------------+
   (*) Usually used: %11 for Tracks  1-17
                     %10 for Tracks 18-24
                     %01 for Tracks 25-30
                     %00 for Tracks 31-35

 --- Information taken from AAY1541 - http://www.the-dreams.de ----

RapidLok-Reference:

 STA $1C00  : $0405
 STA $1C00  : $050A
 LDA $1C00  : $0567
 LDA $1C00  : $061D
 LDX $1C00  : $06C2
 STA $1C00  : $06D2
 LDA $1C00  : $06DF
 STA $1C00  : $06E8
 LDA $1C00  : $069E
 LDA $1C00  : $0726

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