DTC DTC-510B User manual

Data Technology Corporation
DTC 5008 Series
DISK CONTROLLERS
USER'S MANUAL

DATA TECBIIlOLOGY CORPORATION
DTC 588B SERIES DISK COIiTROLLERS
USER'S MANUAL
DTC part number 89-88181. Revision 88
Data Technology Corporation
Main Office
2775 Northwestern Parkway
Santa Clara, California 95851
[phone]
Eastern Region Sales Office
16 Wiggins Avenue
Bedford, HA 81738
[phone]

PREFACE
warranty
Data Technology corporation (DTC) maintains a complete Repair Department
for the sole purpose of providing efficient, reliable service. All DTC
products are warranted against defects in material and workmanship. The
period of coverage and other warranty details are clearly specified in
the DTC purchase agreement. Check this agreement for exact warranty
details.
Accuracy
All information in this manual is based on the latest product
information available at the time of printing. DTC has reviewed the
accuracy of the technical specifications, but DTC cannot be held
responsible for any omissions or errors that may appear in this manual.
Change Information
The DTC product line is constantly being reviewed and improvements are
implemented when appropriate. From time to time DTC will distribute
Field Change Orders and Technical Bulletins to inform users of
enhancements or improvements to their products.
Trademarks
LSI-II is a trademark of Digital Equipment Corporation
VERSAbus is a trademark of Motorola Corporation
SASI is a trademark of Shugart Associates
IBM Personal Computer is a trademark of International Business Machines
Corporation.
Multibus is a trademark of Intel Corporation
Reproduction
Information in this manual must not be reproduced by any means without
the prior written approval of DTC.
--i--

SECTION 3
3.5.2
3.5.3
3.5.3.1
3.5.3.2
SECTION 4
4.1
4.2
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.3
SECTION 5
5.1
5.2
APPENDIX A
A.l
A.2
A.3
APPENDIX B
B.l
APPENDIX C
C.l
c.l.l
C.l.2
C.l.3
C.2
APPENIDX D
APPENDIX E
APPENDIX F
COMMANDS AND STATUS
Page
OpCode 01 (Assign Drive Type) (535B only); .......••••. 76
Opcode 02 (Set Drive. Parameters) .•..••••.••...•.••... 77
~linchester Drive Parameters .•••••.•••...•..•..•• 78-80
Floppy Drive Parameters
(520B only) •••••••..••....•......•..••.....• 81-83
MAINTENANCE & TROUBLESHOOTING
Overv iew .••.•..•••••••....•..•....•....•..•....••...• 84
Class Code 7 Commands ••..••••..•.••.••••.••••.••..•.. 84
OpCode 00 (RAM Diagnostics) ....•.••....••.••••.••.•.. 86
Opcode 01 (Write ECC Error) .••.•..•••..•.•..•. , •...•• 86
Opcode 02 (Read ID Field) ••.••.•..•••.•........•....• 88
OpCode 03 (Perform Drive Diagnostics) .•.•..••..•..... 90
OpCode 06 (Request Logout) ..••••.••..••.•..••.••.. 90-92
LED Error Display .••.•••.••.••.•.••••..••.••.•..•.•.• 93
APPENDICES -INSTALLATION AND GENERAL INFORMATION
Introduction .........•..•.....•..••......•••.•.•..... 95
Mounting •••.•....•.•••...••.•..•.••.•........•..••.•. 95
LOGICAL ADDRESS
Overview ...•••...•..•...........•.••..•.•...•.....•.. 96
Calculation of Logical Address •.••..•••.••....• , .. 96-97
Determining Cylinder Addresses •.•••.•..•..•..•....... 98
INTERLEAVE
Interleave •..••••..••..•.......•..••.••.••••...•..•.. 99
SECTOR FORMATS
Winchester Drive Sector Formats ..•.•.••..•.......... 102
256 Bytes per Sector/33 Sectors per Track •.•..••..•. 102
512 Bytes per Sector/18 Sectors per Track ....•.....• 103
1,024 Bytes per Sector /9 S,ectors per Track •••.••••.• 103
Floppy Drive Format .•••.•.••...•.•.•.••.••.•••••..•. 103
ALTERNATE TRACK USAGE WITH DTC CONTROLLERS ......... . 104
IMPLEMENTING OVERLAPPED SEEKS ON DTC DISK
CONTROLLERS . ........................................ 105
JUMPER SETTINGS FOR DTC 518B •....•.•....•..•........ 106
--iii--

TABLE OF CONTENTS (continued)
APPENDICES Page
APPENDIX G SWITCH SETTINGS
AND JUMPER CONFIGURATION FOR 52BB ••• 109
APPENDIX H SWITCH SETTINGS
AND JUMPER CONFIGURATIOIil FOR 535B ••• 112
H-l
Jumper Settings for SA800/80l ....................... 115
H-2 Jumper Settings for
SA850/SA85l ..................... 116
H-3
Jumper Settings for TAN DON
TA848-l/2 ............... 116
H-4 Jumper
Settings
for AMLYN
5850 ...................... 117
APPENDIX J SWITCH SETTINGS
AND JUMPER CONFIGURATION FOR 535BK .. 118
J-l DTC-5358K Factory Settings .......................... 120
J-2
Switch Settings for KODAK 3.3 ....................... 120
LIST OF TABLES
TABLE
1-1 Controller Features ........................................... 2-4
1-2 Specifications .................................................. 4
2-1 Interpretaion of Request ....................................... 11
3-1 Summary of Class Code'" OpCodes .................... : ........ 35-37
3-2 Sense Byte Error Codes .......•.............................•... 44
3-3 Floppy Drive Track Format (Byte 5 Class. Code 6) ............ 72-73
4-1 Class Code 7 Commands .......................................... 85
4-2 LED Error Displays ............................................. 94
LIST OF ILLUSTRATIONS
FIGURES
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
3-1
3-2
3-3
3-4
3-5
3-6
Typical System Configuration ............................ , ....... 7
500B Series Host Interface Signals and Pin Designation. '" ...... 8
Controller to Winchester Drive Control Interface ............... 12
Controller to Winchester Drive Data Interface .................. 13
520B Controller to Floppy Disk Drive Interface ................. 14
535B Controller to Floppy Drive Interface ...................... 15
5358 Controller to Amlyn Drive Interface .•..................... 16
535BK Controller to KODAK Disk Drive Interface ..............•.. 17
Timing Diagrams .............•............................... 20-25
Flowcharts .................................................. 26-29
Typical Command Discriptor Block (CDB) ......................... 32
Test Drive Ready ............................................... 38
Recalibrate Drive .............................................. 39
Request ECC Syndrome .....................•..................•.. 40
Request Sense .................................................. 41
Format Drive ..............................................••... 46
--iv--

TABLE OF CONTENTS (continued)
LIST OF ILLUSTRATIONS
FIGURES
Page
3-7
3-8
3-9
3-10
3-11
3-12
3-l3
3-14
3-15
3-16
4-1
4-2
4-3
B-1
F-l
F-2
G-l
G-2
H-l
H-2
J-l
J-2
Check Track Format ..................•.......................... 48
Format Track .....•.............•..............•................ 50
Format Bad Track .•..................•.................•........ 52
Read Block Command Flowchart ................................... 55
Write Block Command Flowchart .................................. 58
Seek •........•................................................. 61
Search Routine Flowchart ....................................... 65
Random Read Routine Flowchart .................................. 66
Increment Sector, Head, or Cylinder Flowchart .................. 67
Copy Command Flowchart ......................................... 70
h'ri te ECC Command .............................................. 87
, Read ID Field .................................................. 89
Drive Diagnostic ............................................... 91
Physical versus Logical Sector ................•......•.... 100-101
DTC 510B Cable Connections .................................... 107
DTC 510B Board Outline with Mounting Holes .................... 108
DTC 520B Cable Connections ............•....................... 110
DTC 520B Board Outline with Mounting Holes .................... 111
DTC 535B Cable Connections .................................... 1Ll'
DTC 535B Board Outline with Mounting Holes .................... 11~
DTC 535BK Cable Connections .....•...•......................... 121
DTC 535BK Board Outline with Mounting Holes ...•............... 122
--v--

SECTION 1
1.1 Scope of Guide
This guide, for Data Technology Corporation's 500B Series Disk Drive
Controllers, provides:
Equipment Information and Specifications
Interface and Configuration Information
Command and Programming Information
Installation and Testing Instructions
Maintenance and Troubleshooting Hints
This guide is intended to satisfy the information requirements of OEM
Engineers; Engineering and Production Technicians; Personal Computer
Enthusiasts; and others with a need to know about these disk
Controllers.
1.2 Overview of Equipment
The DTC-5l0B is designed to control two industry standard ST506/406 or
compatible 5.25 Winchester Disk Drives.
The DTC-520B is designed to control a maximum of four disk drives. It
supports up to two ST506/406 or compatible 5.25 inch Winchester Disk
Drives plus two industry standard SA4XX, or equivalent, (48 or 96TPI)
Floppy Disk drives.
The DTC-535B is designed to control a maximum of four drives in any
combination of up to two industry standard 5.25 inch Winchester Disk
Drives, and any combination of two industry standard SA8XX type
interface 8 inch Floppy Disk Drives. Alternately, it can be strapped
tor a combination of two hard disk drives and two AMLYN 5850 drives or
one SA8XX and one AMLYN 5850.
The DTC-535BK is designed to control a maximum of four drives in any
combination of up to two industry standard ST506 5.25 inch Winchester
Disk Drives, or equivalent, or up to four 5.25 inch KODAK 3.3 Floppy
Disk Drives.
Currently supported disk drives are
produced by:
KODAK IMI
SEAGATE
COGITO
BASF
MPI SHUGART
QUANTUM
Cii-HB OPE TAN DON MICROPOLIS
CMI RODIME TI
TULIN
FUJITSU MINISCRIBE MICROSCIENCE MAXTOR
The interface to the !lost Computer is via the industry standard SASI bus
and is easily accomplished by a standard DTC Host Adapter. DTC is a
major supplier of SASI compatible Host Adapters for most computer system
buses.
--1--

1.2 OVerview of Equipment (continued)
Contact your DTC sales representative for information on available Host
Adapters.
Proprietary LSI Circuits, based on DTC's field-proven design, allow for
enhanced performance, small size and economy. Reliability and
maintainability have been proven by statistical information from field
installation. The Mean Time between Failures (MTBF) for these
Controllers is 20,000 hours. The Mean Time to Repair (MTTR) is 0.1 hour.
Features found in a DTC-500B Series Controller are given in Table 1-1.
AUTOMATIC SEEK
VERIFY
MULTIPLE BLOCK
TRANSFERS
AUTOMATIC HEAD
and CYLIII1DER
SWITCHIHG
PARITY SELECTIOH
PROGRAMMABLE
SECTOR
IBTERLEAVIHG
BARD DISK
SECTOR SIZE
·PROGRAMMABLE
FLOPPY TRACK
FORMAT
TABLE 1-1
Controller Features
A seek command is implied in every data
transfer command (READ, WRITE, CHECK TRACK
FORMAT, etc.). If the heads are not positioned
over the correct cylinder, a seek is initiated,
and a cylinder verification is performed after
the seek completes.
Allows more than one block to be transferred
with one command.
~ilien the end of a track is reached (during a
multi-block data transfer) the Controller
switches heads to the next track. lilien the end
of a cylinder is reached, the Controller seeks
to the next cylinder, selects head 0 and
resumes transfer.
Odd parity is generated within the Controller
for all information put on the I/O bus. ~fuen
parity is enabled (by jumper selection) all bad
parity information is flagged.
Up to a 16 way programmable interleave is
provided.
Selectable Winchester Sector size of 256 bytes
(33 Sectors), 512 bytes(18 sectors), or 1,024
bytes (9 Sectors).
The type of track format on the floppy media
that is going to be used can be passed to the
Controller through software.
--2--

MEDIA ASSIGNMENT
FUNCTION
HOST INTERFACE
PROTOCOL
LOGICAL to
PHYSICAL
DRIVE CORRELATION
PROGRAMMABLE DISK
DRIVE PARAMETERS
DOUBLE STEP
FUNCTION
CONTROLLER 10
SELECTABLE
ON BOARD SECTOR
BUFFER
ALTERNATE TRACK
ADDRESSING
DATA ERROR
SENSING
and CORRECTION
TABLE 1-1
Contro11er Features (continued)
This function allows the user to read
conventional 48 tpi or 96.tpi diskettes on
KODAK 3.3 disk drive.
A bi-directional (SASI) bus between the
Controller and Host provides a simple.and
efficient communication path. A high level
command set permits effective con~and
initiation.
Logical unit numbers (LUN's) are independent of
physical port numbers. All accesses specify
LUN's
The disk drive parameters are passed to the
Controller from the Host (as data) to define
the drive's characteristics. Standard firmware
supports up to 8 heads. Up to 1024 cylinders
are supported. Optional firmware on some
Controllers support up to 16 heads.
Allows the user to Read/Hrite 48 TPI diskettes
on a 96 TPI Floppy Drive.
A jumper is provided to specify the Controller
ID number on the 5l0B and 520B. The 535B and
535BK use switches to specify the Controller ID
number.
A sector buffer is provided on the Controller
to eliminate the possibility of data overruns
during a data transfer.
The Host can assign an alternate track for a
defective track. (Subsequent accesses to the
defective track will cause the Controller to
transfer data from the alternate track
address). The maximum number of alternate track
addresses is half the total number of tracks on
the disk.
If a data error is detected during a disk data
transfer, the Controller indicates whether or
not it is correctable. If correctable, either
a pointer and mask can be requested by the Host
for applying the correction or the error can be
automatically corrected.
--3--

FAULT DETECTION
ERROR INDICATORS
1.3 Specifications
TABLE 1-1 Controller Features (continued)
In the 5008 series Controller, two classes of
faults are flagged to improve error handling:
* Controller faults
* Disk faults
Eight LED indicators are installed to aid in
the analysis of errors.
Specifications are given on Table 1-2.
Environmental Parameters
Ambient Temperature
Relative Humidity
(At 40 degrees F
wet bulb temperature
and no condensaQJon)
Altitude
Physical Dimensions
Width (in.)
Length (in.)
Height (in.)
Weight (lbs)
TABLE 1-2
Specifications
Operating
32 to 131 degrees F
o to 55 degrees C
10% to 95%
0
to
10,000
ft.
5108 5208
5.75 5.75
8.35 HJ.00
0.49 0.49
1.12 2.00
lion-Operating
-40 to 167 degrees F
-40 to 75 degrees C
10% to 95%
0 to
15,000 ft.
5358 5358K
5.75 5.75
10.35 10.00
0.49 0.49
2.00 2.00
NOTE: Mounting holes are identical to 5.25 inch disk drive mounting
holes.
Power Reguirements
51<l8 5208 5358 5358K
Voltage DC +5%
+5v
+5v +5v +5v
50 millivolts peak-
to-peak
maximum ripple
Current
AMPS Max.
2.2A
2.6A 2.6A 2.6A
--4--

1.4 Maintenance Philosophy
The error detection capability of these Controllers allows isolation of
a fault to a defective disk drive or Controller. If the disk drive is
faulty, the manufacturer's documentation should be reviewed to determine
disposition.
A two level maintenance philosophy is recommended for the DTC-500B
Series Controller and associated Host Adapter.
Level - Replacement of the defective module at the user's site.
Level 2 - Replacement of defective component at DTC's
manufacturing facility.
Section 4 of this manual provides maintenance and troubleshooting data
that should be reviewed for additional information.
Contact DTC prior to returning any material.
1.5 Related Documents
Related documents include:
- Host CPU documentation
- Disk Drive Manufacturer's documentation
- Host Adapter Installation and Software Instructions
1.6 Inquiries
Contact your Data Technology Corporation Sales Representative or:
DATA TECHNOLOGY CORPORATION
2775 Northwestern Parkway
Santa Clara, CA 95051
[phone]
TWX 910-338-2044
DATA TECHNOLOGY CORPORATION
15 Wiggins Avenue
Bedford, MA 01730
(617 275-4044)
--5--

SECTION 2
HOST AND DISK DRIVE INTERFACES
2.1 Interface Connections
Figure 2-1 is a block diagram of a typical system configuration. (See
the Appendices in back of this manual for the location of the
Controller's Cable and Power Connectors). The Host Computer's I/O Bus is
attached to the Controller with the appropriate Host Adapter. The Host
Adapter ensures signal compatibility between the Host Computer and the
Controller. The Host Adapter translates the signals transferred between
the Host Computer's I/O Bus and the Controller's SASI Interface. This
includes directing signals, with the correct polarity, level and timing
to the corresponding connector pin.
The Winchester Disk Drive Control Interface exchanges status and control
information between the Controller and the Disk Drive(s).' It is daisy-
chained to each Disk Drive attached to the Controller, and a terminator
is installed in the last physical Disk Drive connected to the chain.
Disk Drive parameters, such as the maximum number of cylinders and
number of heads, are passed to the Controller from the Host Computer.
This allows Disk Drives with different parameters and characateristics
to be attached concurrently to the Controller with no special
requirements.
The Winchester Disk Drive's Data Interface has a separate cable for each
Disk Drive. It exchanges serial MFM Data between the Controller and the
Selected Disk Drive.
The Controller's D.C. Power Interface requirements are given in Table
1-2.
2.2 Host Interface
The ContrOller's Host Interface is attached, via the appropriate Host
Adapter, to the I/O Bus of the Host Computer. Each computer
manufacturer specifies the signal names and timing considerations for
their I/O Bus.
Figure 2-2 shows the name, pin designation, and direction of the signals
on the Controller's Host Interface connector.
--6--

/
HOST COMPUTER I/O BUS /
I U
HOST ADAPTER
SASI BUS
USA" BUS
DISK DRIVE
CONTROLLER
--------
--------
---
- --l
1
I
I
DISK DRIVE I I
I
(ST-506/406 Comp.) 1
I
I
1
I
I
T I
DISK DRIVE 2 I
I
(ST-506/1f06 Comp.) I
I
I
--
I
5 114' Winchester Drives I
_________________ - __ I
T = Terminator
I
1-
------------- --
1
1
1 -
I FLOPPY DRIVE I
I
I
I
I
1
I
I
1
L--..-
T
1 FLOPPY
DRIVE 2
I
I
I
1 . I
I
I 5 1/4 Floppy Dnves :
L JUJI !O..! ~i~ ~ !!' !'~~~.J
Figure 2-1 Typical System Configuration
--7--

HOST ADAPTER
INTERFACE LINES
DTC-SeeB SERIES
DATA 0 (DB0)
<----------------------------> 2
DATA l (DB1)
<----------------------------> 4
DATA 2 (DB2)
<----------------------------> 6
DATA 3 (DB3)
<----------------------------> 8
DATA 4 (DB4)
<----------------------------> 10
DATA 5 (DB5)
<----------------------------> 12
DATA 6 (DB6)
<----------------------------> 14
DATA 7 (DB7)
<----------------------------> 16
PARITY BIT (PAR)
<----------------------------> 18
GND 20
GND 22
GND 24
NC 26
GND 28
GND 30
__________ ~GN~D~----------------t32
GND 34
BUSY
<----------------------------> 36
ACKNOWKLEDGE (ACK)
<----------------------------> 38
RESET (RST)
<----------------------------> 40
MESSAGE (MSG)
<----------------------------> 42
SELECT (SEL)
<----------------------------> 44
COMMAND/DATA (C/D
<----------------------------> 46
REQUEST (REQ)
<----------------------------> 48
INPUT/OUTPUT (I/O
<----------------------------> 50
NOTE: All signals are negative true and all odd pins are
connected to ground (except for pin 25). The signal
lines are terminated with 220 ohms to 5V and 330 ohms
to ground. Pin 25 and 26 can be used for terminator
power so they are left unconnected.
FIGURE 2-2
HOST INTERFACE SIGNALS and PIN DESIGNATION
--8--

2.2 Host Interface (continued}
The Controller's Host Interface uses negative-logic (negative or low
true logic~ and utilizes a bi-directional 8-bit bus with a jumper
selectable parity bit. The Controller regulates transfers across the
bus in a manner that permits connection to Host computers utilizing
Direct Memory Access (DMA) as well as to those Host computers that
support only programmed input/output transfers (the Controller also
regulates data transfers across the bus to eliminate data overruns that
could occur during the transfer to data).
2.3 Signal Definitions
In this manual, the term "Asserted" means that the signal on the Host
Interface is true and between 0.0 Volts and +0.8 Volts. The term
"Deasserted" means that the signal on the Host Interface is false and
between +2.5 volts and +3.5 volts. -----
2.3.1 Bi-directional Bus Signals
Data 0 through Data 7 and Parity Bit - These lines represent the eight
data bits and the Parity bit that is passed between the Host Computer
land the Controller in the form of a command or data byte. Because the
'Controller utilizes odd parity, (when enabled) the number of bits
asserted on this bus (by the Controller) will always be odd. The
Controller will issue a parity error flag if an even number of bits are
asserted on this bus by the Host Computer.
2.3.2 Un i-directional Signals from the Host Adapter
These are input signals to the Controller from the Host Adapter.
ACKNOWLEDGE (ACK)
This bit is asserted as a response to REO from the Controller. ACK must
be returned for each REO assertion. The Controller will wait for the
assertion of ACK before REO is deasserted. The Host Adapter must not
deassert ACK until after REO has been deasserted. If the Host Adapter
keeps ACK asserted, the Controller will not reassert REO until after ACK
is deasserted. This provides the Host Adapter with a means of regulating
the transfer of bytes across the bus. Byte transfer regulation can
occur for either command or data bytes.
--9--

2.3.2 Uni-directional Signals from the Host Adapter (continued)
RESET (RST)
When asserted, this bit will force the Controller to the beginning of
its microcode program and set all drive parameters to their default
value. Reset immediately terminates any pending command without the
transmission of the status or message bytes. Any error status request
(after RST has been asserted) will result in invalid status information
being transferred. All Disk Drive interface lines are deasserted.
Reset must be asserted for a minimum of 250 nanoseconds and a maximum of
10 seconds. The Controller monitors its Host Interface and waits for an
asserted Select (SEL) signal and the asserted ID bit corresponding to
the Controller after Reset.
SELECT (SEL)
When asserted, indicates ~he beginning of the command transaction. The
Host Adapter asserts SEL to gain the attention of the Controller. A
Data bit on the bus must also be asserted during SEL time to select a .
Controller. The Controller will return BUSY as acknowledgement for SEL.
After the assertion of BUSY, the Host Adapter will deassert SEL and the
data bit (ID bit). The Controller will wait until SEL is deasserted
before it asserts REQ. SEL can be asserted immediately following a
Reset.
--10--

2.3.3 Uni-directional Signals from the Controller
These are the output signals from the Controller to the Host Adapter:
Input/Output (I/O) -When asserted, the information on the bi-
d~rectional Bus ~s driven by the Controller. When deasserted, the
information on the bi-directional Bus is driven by the Host. The Host
may use this signal to enable its Data Bus line drivers.
Command/Data (C/D) -When asserted, the information bytes transmitted
across the b~-d~rectional Bus are command, status, or message bytes.
Ilhen deasserted, the bytes transmitted across the bi-directional Bus are
data bytes.
Busy (BUSY) - This bit is asserted in response to the Select signal and
ID b~t be~ng asserted from the Host to indicate that the Controller's
Host Interface is currently in use. Busy remains asserted through the
message phase.
Hessage (MSG) -When asserted, this line indicates that the command is
completed. This bit is always followed with the assertion of the
Tnput/Output and Request signals.
Request (REQ) - This bit operates in conjunction with the Input/Output,
Command/Data, and Message signals. See Table 2-1 for an interpretation
of these signal lines.
TABLE 2-1
Interpretation of Request
State of Signal Lines
REQ
I/O CD MSG Meaning
I a d a d
Get Command byte
from Host Adapter
I a cl.
d d Get Data byte
from Host Adapter
I a a d d
Send Data byte to Host Adapter
I a a a d
Send Status byte to Host Adapter
I a a a a
Send Message byte
to Host Adapter
I
a = asserted d = deasserted
2.3.4 Controller/Disk Drive Interface Signals
Figures 2-3, 2-4, 2-5, 2-6, 2-7 and 2-8 show the name, pin designation,
and direction of the signals on the Controller's drive interface.
These interface signals are explained in the corresponding Disk Drive
documentation.
--11--

D'l'C-588B SERIES
WINCHESTER
CONTROL INTERFACE
* 2
4
6
8
113
12
14
16
18
213
22
24
26
28
313
32
34
SIGNAL NAME
REDUCED
WRITE CURREUT--->
2
HEAD SELECT 2
--------->
WRITE
GATE-------------->
<--SEEK COMPLETE
<--TRACK
1313
<--WRITE FAULT
0
HEAD
SELECT
2----------->
RESERVED1
HEAD SELECT 2
---------->
<--INDEX
<--READY
STEP-------------------->
DRIVE SELECT
1---------->
DRIVE SELECT 2
-----'---->
DRIVE SELECT
3---------->
DRIVE SELECT
4---------->
DIRECTION IN
----------->
ST-586/412
COMPATIBLE
CONTROL INTERFACE
NOTE; All odd numbered pins are connected to signal ground .
• AII signals are negative true.
See Figure 2-4 for Drive's Data Interface information
* When using Controller with optional firmware and utilizing
more than eight (8) heads, this line is used as a head select
lina.
li'IGUM 2-3
CONTROLLER to WINCHESTER DRIVE CONTROL INTERFACE
--12--

DTC-51iJ1iJB SERIES
WINCHESTER
DATA INTERFACE
___ L __
---
-
1
2
3
4
5
6
7
8
9
HI
11
12
13
14
15
16
17
18
19
_20
SIGI!IAL NAMES
<---DRIVE SELECTED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
+MFM
WRITE
DATA-------->
-MFM WRITE DATA-------->
<---+MFM READ DATA
<----MFM
READ
DATA
NOTE: Reserved lines may be spares.
ST-51iJ6/412
COMPATIBLE
DATA INTERFACE
__ L_
---
-
See Figure 2-3 for Drive's Control Interface information
FIGURE 2-4
COII1TROLLER to WINCBES'rER DRIVE DATA 1II1TERPACE
--13--