are the other bits checked for 1's?
FBFA - wd1010 sdh register (read/write)
FBFB - wd1010 write command (write)/wd1010 read status register (read)
F9F8 - WD1010 data register (read/write)
F9F9 = wd1010 precomp register (write)
F9FA = wd1010 sector count register (read/write) F9FB = wd1010 sector number register (read/write) FAF8 = wd1010 cylinder low register (read/write) FAF9 = wd1010 cylinder high register (read/write) FAFA = drive select? drive bits match those in sdh.(write)
wd1010 documentation says head select/drive select not available as outputs.
* 256 bytes per sector.
* 32 sectors per cylinder
* AMSDOS & CPM based filesystem
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