hdd2.txt

Oh, yes..... Asssssssm :-]]]]]]

01F0-01F7 ----	HDC 1	(1st Fixed Disk Controller)   same as 017x (ISA, EISA)

01F0	r/w	data register

01F1	r	error register
		diagnostic mode errors:
		 bit 7-3	reserved
		 bit 2-1 = 001	no error detected
			 = 010	formatter device error
			 = 011	sector buffer error
			 = 100	ECC circuitry error
			 = 101	controlling microprocessor error
		 operation mode:
		  bit 7	 = 1  bad block detected
			 = 0  block OK
		  bit 6	 = 1  uncorrectable ECC error
			 = 0  no error
		  bit 5	      reserved
		  bit 4	 = 1  ID found
			 = 0  ID not found
		  bit 3	      reserved
		  bit 2	 = 1  command completed
			 = 0  command aborted
		  bit 1	 = 1  track 000 not found
			 = 0  track 000 found
		  bit 0	 = 1  DAM not found
			 = 0  DAM found (CP-3022 always 0)

01F1	w	WPC/4  (Write Precompensation Cylinder divided by 4)

01F2	r/w	sector count
01F3	r/w	sector number
01F4	r/w	cylinder low
01F5	r/w	cylinder high

01F6	r/w	drive/head
		 bit 7	 = 1
		 bit 6	 = 0
		 bit 5	 = 1
		 bit 4	 = 0  drive 0 select
			 = 1  drive 1 select
		 bit 3-0      head select bits

01F7	r	status register
		 bit 7 = 1  controller is executing a command
		 bit 6 = 1  drive is ready
		 bit 5 = 1  write fault
		 bit 4 = 1  seek complete
		 bit 3 = 1  sector buffer requires servicing
		 bit 2 = 1  disk data read successfully corrected
		 bit 1 = 1  index - set to 1 each disk revolution
		 bit 0 = 1  previous command ended in an error

01F7	w	command register
		commands:
		 98 E5	 check power mode	(IDE)
		 90	 execute drive diagnostics
		 50	 format track
		 EC	 identify drive		(IDE)
		 97 E3	 idle			(IDE)
		 95 E1	 idle immediate		(IDE)
		 91	 initialize drive parameters
		 1x	 recalibrate
		 E4	 read buffer		(IDE)
		 C8	 read DMA with retry	(IDE)
		 C9	 read DMA without retry (IDE)
		 C4	 read multiplec		(IDE)
		 20	 read sectors with retry
		 21	 read sectors without retry
		 22	 read long with retry
		 23	 read long without retry
		 40	 read verify sectors with retry
		 41	 read verify sectors without retry
		 7x	 seek
		 EF	 set features		(IDE)
		 C6	 set multiple mode	(IDE)
		 99 E6	 set sleep mode		(IDE)
		 96 E2	 standby		(IDE)
		 94 E0	 standby immediate	(IDE)
		 E8	 write buffer		(IDE)
		 CA	 write DMA with retry	(IDE)
		 CB	 write DMA with retry	(IDE)
		 C5	 write multiple		(IDE)
		 E9	 write same		(IDE)
		 30	 write sectors with retry
		 31	 write sectors without retry
		 32	 write long with retry
		 33	 write long without retry
		 3C	 write verify		(IDE)
		 9A	 vendor unique		(IDE)
		 C0-C3	 vendor unique		(IDE)
		 8x	 vendor unique		(IDE)
		 F0-F4	 EATA standard		(IDE)
		 F5-FF	 vendor unique		(IDE)