PORTIBM PC Portable (uses same BIOS as XT) 0340-035F -  Adaptec AHA-152x SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. adapter
Range:	alternate address at 0140
Note:	Adaptec AHA-152x SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. adapter series are based upon Adaptec
	  AIC-6260/6360/6370 SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. controllers
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) xxxxh"Adaptec AIC-78xx"

+000  RW  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. sequence control register (SCSISEQ) (see #P0600)
+001  RW  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer control register 0 (SXFRCTL0) (see #P0601)
+002  RW  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer control register 1 (SXFRCTL1) (see #P0602)
+003  R-  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. control signal read  register (SCSISIGI) (see #P0603)
+003  -W  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. control signal write register (SCSISIGO) (see #P0604)
+004  RW  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. rate control register (SCSIRATE) (see #P0605)
+005  RW  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. ID register (SCSIID) (see #P0606)
+006  RW  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. latched data register (SCSIDAT)
	  read/write causes -ACK to pulse
+007  R?  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. data bus register (SCSIBUS)
+008  RW  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer count register (STCNT) (3 bytes long)
+00B  R-  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 0 (SSTAT0) (see #P0607)
+00B  -W  clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt register 0 (CLRSINT0) (see #P0608)
+00C  R-  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 1 (SSTAT1) (see #P0609)
+00C  -W  clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt register 1 (CLRSINT1) (see #P0610)
+00D  R-  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 2 (SSTAT2) (see #P0611)
+00E  R-  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 3 (SSTAT3) (see #P0612)
+00E  ?W  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. test control register (SCSITEST) (see #P0613)
+00F  R-  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 4 (SSTAT4) (see #P0614)
+00F  -W  clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt register 4 (CLRSINT4) (see #P0615)
+010  RW  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt mode register 0 (SIMODE0) (see #P0616)
+011  RW  SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt mode register 1 (SIMODE1) (see #P0617)
+012  RW  DMAsee Direct Memory Access control register 0 (DMACNTRL0) (see #P0618)
+013  RW  DMAsee Direct Memory Access control register 1 (DMACNTRL1) (see #P0619)
+014  RW  DMAsee Direct Memory Access status register (DMASTAT) (see #P0620)
+015  RW  FIFO status register (FIFOSTAT)
+016w RW  data port register (DATAPORT)
+018  RW  burst control register (BRSTCNTRL) (see #P0621)
+01A  RW  port A register (PORTA) (see #P0622)
+01B  RW  port B register (PORTB) (see #P0623)
+01C  RW  revision register (REV)
+01D  RW  stack register (STACK)
+01E  RW  test register (TEST) (see #P0624)
+01F  R?  (AIC-6360+) ID register (ID)
	  32-byte ID string can be read here
Notes:	the SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. latched data register is used to transfer data on the SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. bus
	  during automatic or manual PIO mode
	the SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. data bus register reflects the state of SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. data bus lines
	  directly


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. sequence control register (SCSISEQ):
Bit(s)	Description	(Table P0600)
 7	enable target mode (TEMODEO)
 6	enable selection out (ENSELO)
 5	enable selection in  (ENSELI)
 4	enable reselection in (ENRESELI)
 3	"ENAUTOATNO"
 2	"ENAUTOATNI"
 1	enable auto -ATN on parity error (ENAUTOATNP)
 0	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. reset out (SCSIRSTO)
Note:	each bit when set starts a specific SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. sequence on the bus
SeeAlso: #P0602,#P0607,#P0608,#P0616


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer control register 0 (SXFRCTL0):
Bit(s)	Description	(Table P0601)
 7	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. FIFO enable (SCSIEN)
 6	DMAsee Direct Memory Access  FIFO enable (DMAEN)
 5	channel enable (CHEN)
 4	clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer counter (CLRSTCNT)
 3	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. PIO enable (SPIOEN)
 2	SCAM enable (SCAMEN)
 1	clear channel (CLRCH)
 0	reserved
SeeAlso: #P0602,#P0607,#P0611,#P0618,#P0620


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer control register 1 (SXFRCTL1):
Bit(s)	Description	(Table P0602)
 7	bit bucket (BITBUCKET)
 6	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. counter wrap enable (SWRAPEN)
 5	enable SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. parity check (ENSPCHK)
 4-3	selection time-out select (STIMESEL)
	00 256 ms
	01 128 ms
	10 64  ms
	11 32  ms
 2	enable selection timer (ENSTIMER)
 1	byte align (BYTEALIGN)
 0	reserved
SeeAlso: #P0600,#P0601


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. control signal read register (SCSISIGI):
Bit(s)	Description	(Table P0603)
 7	-C/D input (CDI)
 6	-I/O input (IOI)
 5	-MSG input (MSGI)
 4	-ATN input (ATNI)
 3	-SEL input (SELI)
 2	-BSY input (BSYI)
 1	-REQ input (REQI)
 0	-ACK input (ACKI)
Note:	this register reflects the actual state of the SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. bus control lines
SeeAlso: #P0604


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. control signal write register (SCSISIGO):
Bit(s)	Description	(Table P0604)
 7	-C/D output (CDO)
 6	-I/O output (IOO)
 5	-MSG output (MSGO)
 4	-ATN output (ATNO)
 3	-SEL output (SELO)
 2	-BSY output (BSYO)
 1	-REQ output (REQO)
 0	-ACK output (ACKO)
Notes:	writing to this register modifies the control signals on the bus; only
	  those signals that are allowed in the current mode (initiator/target)
	  are asserted
	bits 7-5 in initiator mode represent the expected SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. bus phase and
	  can be used to trigger phase mismatch and phase change interrupts
SeeAlso: #P0603


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. rate control register (SCSIRATE):
Bit(s)	Description	(Table P0605)
 7	reserved
 6-4	synchronous transfer rate (SXFR)
	rate = 100 + SXFR * 25 (ns)
 3-0	synchronous offset (SOFS)
Note:	contents of this register determine the synchronous SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. data transfer
	  rate and the maximum synchronous -REQ/-ACK offset; an offset of 0 in
	  the bits 3-0 disables synchronous data transfers, any offset value
	  greater than 0 enables snchronous transfers
SeeAlso: #P0611


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. ID register (SCSIID):
Bit(s)	Description	(Table P0606)
 7	reserved
 6-4	our ID (OID)
 3	reserved
 2-0	target ID (TID)
Note:	this register contains the SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. ID of the board and the current target
	  on the selected channel
SeeAlso: #P0982


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 0 (SSTAT0):
Bit(s)	Description	(Table P0607)
 7	target mode (TARGET)
 6	selection out done (SELDO)
 5	selection in  done (SELDI)
 4	selection in progress (SELINGO)
 3	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. counter wrap (SWRAP)
 2	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. PIO done  (SDONE)
 1	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. PIO ready (SPIORDY)
 0	DMAsee Direct Memory Access done (DMADONE)
Note:	bits 1-0 and 6-4 are self-clearing
	bit 2 is set when the SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer count register decrements to 0
SeeAlso: #P0600,#P0601,#P0608,#P0616


Bitfields for clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt register 0 (CLRSINT0):
Bit(s)	Description	(Table P0608)
 7	set SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. PIO done? (SETSDONE)
 6	clear selection out done (CLRSELDO)
 5	clear selection in  done (CLRSELDI)
 4	clear selection in progress (CLRSELINGO)
 3	clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. counter wrap (CLRSWRAP)
 2	clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. PIO done (CLRSDONE)
 1	clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. PIO ready (CLRSPIORDY)
 0	reserved
Note:	writing 1 to a bit clears the associated SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt; writing 1 to
	  the bits 3-2 also clears the asscoiated bits in SSTAT0
SeeAlso: #P0600,#P0601,#P0607,#P0616


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 1 (SSTAT1):
Bit(s)	Description	(Table P0609)
 7	selection time-out (SELTO)
 6	(target) "ATNTARG"
 5	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. reset in (SCSIRSTI)
 4	phase mismatch (PHASEMIS)
 3	bus free (BUSFREE)
 2	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. parity error (SCSIPERR)
 1	phase changed (PHASECHG)
 0	-REQ asserted (REQINIT)
Notes:	bit 0 can be cleared by setting bit 0 in the clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt 1
	  register (CLRSINT1), and by asserting -ACK as well
	bit 4 is self-clearing
SeeAlso: #P0602,#P0603,#P0604,#P0610,#P0617


Bitfields for clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt register 1 (CLRSINT1):
Bit(s)	Description	(Table P0610)
 7	clear selection time-out (CLRSELTIMEO)
 6	clear -ATN output (CLRATNO)
 5	clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. reset in (CLRSCSIRSTI)
 4	reserved
 3	clear bus free (CLRBUSFREE)
 2	clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. parity error (CLRSCSIPERR)
 1	clear phase changed (CLRPHASECHG)
 0	clear -REQ asserted (CLRREQINIT)
Note:	writing 1 to a bit clears the associated SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt; writing 1 to
	  the bits 3-0, 5, and 7 also clears the associated bits in SSTAT1
SeeAlso: #P0603,#P0604,#P0609,#P0617


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 2 (SSTAT2):
Bit(s)	Description	(Table P0611)
 7-6	reserved
 5	"SOFFSET"
 4	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. FIFO empty (SEMPTY)
 3	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. FIFO full	(SFULL)
 2-0	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. FIFO count (SFCNT)
Note:	the SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. FIFO is 8 bytes long; bit 3 is set when all the 8 bytes are
	  full (bits 2-0 are clear)
SeeAlso: #P0601,#P0605,#P0614,#P0615


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 3 (SSTAT3):
Bit(s)	Description	(Table P0612)
 7-4	"SCSICNT"
 3-0	"OFFCNT"
SeeAlso: #P0605,#P0611


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. test control register (SCSITEST):
Bit(s)	Description	(Table P0613)
 7-4	reserved
 3	"SCTESTU"
 2	"SCTESTD"
 1	reserved
 0	"STCTEST"
SeeAlso: #P0624


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. status register 4 (SSTAT4):
Bit(s)	Description	(Table P0614)
 7-3	reserved
 2	"SYNCERR"
 1	FIFO write error? (FWERR)
 0	FIFO read  error? (FRERR)
SeeAlso: #P0611,#P0615


Bitfields for clear SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt register 4 (CLRSINT4):
Bit(s)	Description	(Table P0615)
 7-3	reserved
 2	"CLRSYNCERR"
 1	clear FIFO write error? (CLRFWERR)
 0	clear FIFO read	 error? (CLRFRERR)
SeeAlso: #P0611,#P0614


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt mode register 0 (SIMODE0):
Bit(s)	Description	(Table P0616)
 7	reserved
 6	enable selection out done (ENSELDO)
 5	enable selection in  done (ENSELDI)
 4	enable selection in progress (ENSELINGO)
 3	enable SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. counter wrap (ENSWRAP)
 2	enable SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. PIO done  (ENSDONE)
 1	enable SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. PIO ready (ENSPIORDY)
 0	enable DMAsee Direct Memory Access done (ENDMADONE)
Note:	setting any bit will enable the corresponding function to interrupt
	  via the IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. pin
SeeAlso: #P0607,#P0608,#P0617,#P0618


Bitfields for SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. interrupt mode register 1 (SIMODE1):
Bit(s)	Description	(Table P0617)
 7	enable selection time-out (ENSELTIMO)
 6	(target) "ENATNTARG"
 5	enable SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. reset (ENSCSIRST)
 4	enable phase mismatch (ENPHASEMIS)
 3	enable bus free (ENBUSFREE)
 2	enable SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. parity error (ENSCSIPERR)
 1	enable phase changed (ENPHASECHG)
 0	enable -REQ asserted (ENREQINIT)
Note:	setting a bit enables the corresponding function to interrupt via the
	  IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. pin
SeeAlso: #P0609,#P0610,#P0616


Bitfields for DMAsee Direct Memory Access control register 0 (DMACNTRL0):
Bit(s)	Description	(Table P0618)
 7	enable DMAsee Direct Memory Access (ENDMA)
 6	=0 16-bit mode
	=1 8-bit mode (8BIT)
 5	=0 PIO mode
	=1 DMAsee Direct Memory Access mode
 4	double word PIO (DWORDPIO)
 3	=0 read
	=1 write
 2	interrupt enable (INTEN)
 1	reset FIFO (RSTFIFO)
 0	software interrupt (SWINT)
Note:	write to this register takes the controller from the power down mode
SeeAlso: #P0601


Bitfields for DMAsee Direct Memory Access control register 1 (DMACNTRL1):
Bit(s)	Description	(Table P0619)
 7	power down (PWRDWN)
 6	"ENSTK32"
 5	reserved
 4-0	stack pointer? (STK)


Bitfields for DMAsee Direct Memory Access status register (DMASTAT):
Bit(s)	Description	(Table P0620)
 7	"ATDONE"
 6	word ready (WORDRDY)
 5	interrupt status (INTSTAT)
 4	DMAsee Direct Memory Access FIFO full  (DFIFOFULL)
 3	DMAsee Direct Memory Access FIFO empty (DFIFOEMP)
 2	(AIC-6360+?) DMAsee Direct Memory Access FIFO half-full? (DFIFOHF)
 1	(AIC-6360+?) double word ready (DWORDRDY)
 0	reserved
SeeAlso: #P0601,#P0618


Bitfields for burst control register (BRSTCNTRL):
Bit(s)	Description	(Table P0621)
 7-4	bus on	time (BON)
 3-0	bus off time (BOFF)
Note:	the bus on/off times are in microseconds
SeeAlso: #P0624


Bitfields for port A register (PORTA):
Bit(s)	Description	(Table P0622)
 7	transfer mode
	=0 PIO
	=1 DMAsee Direct Memory Access
 6	boot enabled (BOOT)
 5-4	message classes (MSGCLASSES)
	00 #4
	01 #0, #1, #2, #3, #4
	10 #0, #3, #4
	11 #0, #4
 3	initial synchronous negotiation enabled (SYNCNEG)
 2	target disconnect enabled (TARDISC)
 1-0	reserved
SeeAlso: #P0623


Bitfields for port B register (PORTB):
Bit(s)	Description	(Table P0623)
 7	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. parity enabled (PARITY)
 6-5	DMAsee Direct Memory Access channel (DMACHAN)
	00 DMAsee Direct Memory Access channel 0
	01 DMAsee Direct Memory Access channel 5
	10 DMAsee Direct Memory Access channel 6
	11 DMAsee Direct Memory Access channel 7
 4-3	"IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated."
	00,11 IRQ12
	01 IRQ10
	10 IRQ11
 2-0	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. ID
SeeAlso: #P0622


Bitfields for test register (TEST):
Bit(s)	Description	(Table P0624)
 7	reserved
 6	bus off timer test (BOFFTMR)
 5	bus on	timer test (BONTMR)
 4	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer count register high   byte test (STCNTH)
 3	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer count register middle byte test (STCNTM)
 2	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. transfer count register low    byte test (STCNTL)
 1	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. block test (SCSIBLK)
 0	DMAsee Direct Memory Access  block test (DMABLK)
SeeAlso: #P0613,#P0621