🚀 go-pugleaf

Hi all.

I'm trying to program the FDC directly through the I/O ports (0x3f2-0x3f5).
I think I have some things figured out but there are still a lot of things
which are unclear.  For instance:
  1.  Which FDC commands provide an interrupt (IRQ6) when complete?
  2.  The Read command takes 7 parameters (1 byte each):
	1. cylinder #
	2. head #
	3. sector #
	4. bytes per sector
	5. end of track
	6. gap 3 length
	7. data length (if parameter 4 is 0)
      - Since the 'bytes per sector' parameter is only 1 byte, does that mean
        that the max sector size if 255 bytes?  What happens to the 256th byte.
      - What does the 'end of track' parameter do?
      - What is the 'gap 3 length'?
      - What does the 'data length' parameter do?
  3.  How does one determine the # of cylinders, # of sectors, # bytes per
      sector, and # of tracks?
  4.  What do the Read/Write Deleted Data commands do (i.e. what is 'deleted'
      data)?
  5.  What does the Read ID command do (i.e. what is an ID)?
  6.  What do the Scan Equal/Low or Equal/High or Equal commands do?
  7.  What is the 'step rate time'?
  8.  What is the 'head load/unload time'?
  9.  What is MFM mode?
 10.  How does non-DMA mode work?
 11.  What does 'skip deleted-data address mark' mean?

As you can see I'm still rather uninformed.  I ordered the Intel Peripherals
book and it should be here in a few days but I'm not sure if it will contain
any information on the FDC.  So... if anyone can answer any/all of my questions
I'd be happy to hear from you (if you'd rather give me a detailed explanation
of how data is stored on a disk, that info. would be happily received too).

Regards...
marco
-- 
Marco Imperatore (mimperat@cs.dal.ca)