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- _______________________________________________________________________________
-
- WD-27X.DOC Documentation of ST-238R Drive and WD-27X Controller
- _______________________________________________________________________________
-
-
- Seagate 5.25" Half-Height Disk Drives
-
-
- Seagate Drive ST-225 ST-238R ST-251R ST-251 ST-277R
-
- Bytes Unformatted 25.6 Mb 38.4 Mb 51.2 Mb 51.2 Mb 76.9 Mb
- Bytes Formatted MFM 21.4 Mb - - 42.8 Mb -
- Bytes Formatted RLL - 32.7 Mb 43.6 Mb - 65.5 Mb
-
- Cylinders 615 615 820 820 820
- Heads 4 4 4 6 6
- Platters 2 2 2 3 3
- W.P.C. 300 616 821 off 821
- R.W.C. 615 615 820 820 820
- IBM Drive Type 2 (6) (?) 44 (?)
-
- Seek Time 60 ms 55 ms 50 ms 45 ms 40 ms
-
- Bytes per Cylinder 34816 53248 53248 52224 79872
- Tracks 2460 2460 3280 4920 4920
- Bytes per Track 8704 13312 13312 8704 13312
- Sectors per Track 17 26 26 17 26
- Bytes per Sector 512 512 512 512 512
-
-
- _______________________________________________________________________________
-
-
- Seagate ST-238R Jumper Settings
-
-
- Looking at the bottom (circuit card side) with the edge connectors
- UP there are eight pairs of jumpers visible, 16 pins total. From
- left to right those jumper pairs are:
-
- * 1 * Drive Select 1 (straight cable from HDC )
- 2 Drive Select 2 (5 wires twisted in cable)
- 3 Drive Select 3 open
- 4 Drive Select 4 open
- 5 Life Test open
- 6 Write Fault open
- 7 Recovery Mode open
- 8 Radial Mode open
-
- 3.1 Drive Select
-
- DRIVE SELECT enables the controller to select and address the drive.
- Control cable interface options use either Daisy-Chain or Radial
- configuration.
-
- 3.1.1 Daisy-Chain
-
- Drives must be selected as either DRIVE SELECT 1,2,3 or 4, so that only
- one DRIVE SELECT line activates a device. To select, install the
- shorting bar at the appropriate position. The last drive in the chain
- must have a 220/330 ohm resistor termination pack on the PCB.
-
- 3.1.2 Radial Option
-
- By shorting pins 1 and 2 the radial option is enabled. Drives
- configured to this option are always selected and respond to all control
- signals issued on the attached control cable. The resistor termination
- pack remains installed on each radially-configured drive.
-
- 3.2 Write Fault Reset Option
-
- The WRITE FAULT signal may be internally latched. This latch may be
- cleared when DRIVE SELECT goes false (if pins 5 and 6 [write fault] are
- shorted). The standard configuration, with the shorting block removed,
- will cause WRITE FAULT to go false when WRITE GATE goes false.
-
- 3.3 Life Test
-
- This function is used during the manufacturing process and is not
- recommended for field use. When pins 7 and 8 are shorted, the stepper
- motor will continuously seek between track 0 and the maximum cylinder
- and will ignore control signals sent via the interface.
-
- 3.4 Recover Mode Option
-
- The ST-238R may be configured for the RECOVERY MODE feature by shorting
- pins 3 and 4. This option enables the read/write heads to micro-step.
- This repositioning option may be used after the controller has completed
- its retry options on a read error. Refer to section 4.6 for a detailed
- discussion. [ 4.6 reveals that this option allows reads between tracks
- in up to eight micro-steps IF the controller supports this feature. This
- is intended to be used for recovering unreadable data ].
-
-
- _______________________________________________________________________________
-
-
- Western Digital WD1002-27X Controller
-
-
- There are six versions of the WD1002-27X Controller:
-
- ROM BIOS I.D. Feature Description
-
- (1) --- none ---- F000 no ROM BIOS or mounting bracket
- (2) --- none ---- F007 no ROM BIOS w/ mounting bracket
- (3) 62-000087-030 F019 ROM BIOS 0 (standard)
- (4) 62-000088-030 F022 ROM BIOS 1 (26 to 17 sector)
- (5) 62-000089-030 F016 ROM BIOS 2 (26 sector)
- (6) 62-000094-032 F301 Auto-Configuration ROM BIOS
-
-
- _______________________________________________________________________________
-
-
- WD-27X Disk Parameter Table (BIOS 62-000089-030)
-
-
- C800:0041 D5 03 05 D6 03 D6 03-0B 07 FF 03 00 00 00 00 00
- C800:0051 DB 03 07 DC 03 DC 03-0B 00 FF 03 00 00 00 00 00
- C800:0061 64 02 04 65 02 65 02-0B 07 A7 03 00 00 00 00 00
- C800:0071 67 02 04 68 02 68 02-0B 07 AC 03 00 00 00 00 00
-
-
- RLL Table begins at C800:0041 and contains four Drive Types.
-
-
- Type Cyl Heads ReadWrC PreComp ECC CCB Std Format
-
- 0 981 5 982 982 11 7 255 3 x
- 1 987 7 988 988 11 0 255 3 x
- 2 612 4 613 613 11 7 167 3 x
- * 3 * 615 4 616 616 11 7 172 3 x
-
-
- _______________________________________________________________________________
-
-
- WD1002-27X Step Rate Tables
-
-
- The CCB Option Byte and onboard MicroProcessor determine Step Rate.
-
-
- MPU 1015-14 CCB Step Rate
- 0 3000 usec
- 1 3000 usec
- 2 3000 usec
- 3 3000 usec
- 4 200 usec
- 5 70 usec
- 6 3000 usec
- 7 3000 usec
-
- MPU 1015-24 CCB Step Rate
- and MPU 1015A-24 0 3000 usec
- 1 45 usec
- 2 60 usec
- 3 18 usec
- 4 210 usec
- 5 75 usec
- 6 30 usec
- 7 18 usec
-
- MPU 1015-25 CCB Step Rate
- 0 3100 usec
- 1 46.5 usec
- 2 22.5 usec
- 3 10.5 usec
- 4 202.5 usec
- 5 70.5 usec
- 6 38.5 usec
- 7 10.5 usec
-
- MPU 1015E-08 CCB Step Rate
- 0 3300 usec
- 1 24 usec
- 2 24 usec
- 3 11 usec
- 4 24 usec
- 5 24 usec
- 6 24 usec
- * 7 * 11 usec
-
-
- _______________________________________________________________________________
-
-
- WD-27X Jumper Settings (BIOS 62-000089-030)
-
-
- Drive Type: Device 0 Device 1
- S1-1 S1-2 S1-3 S1-4 Jumpers for:
- 0 Close Close Close Close 981 Cyl 5 Heads
- 1 Open Close Open Close 987 Cyl 7 Heads
- 2 Close Open Close Open 612 Cyl 4 Heads
- * 3 * Open Open Open Open 615 Cyl 4 Heads
-
-
- S1-5 S1-6 Jumpers for:
- Close Close RLL - 17 Sectors per Track (W9 ON )
- * Open * Close * RLL - 26 Sectors per Track (W9 OFF)
- Close Open RLL - 17 Sectors per Track (W9 OFF)
- Open Open MFM - 17 Sectors per Track (W9 OFF)
-
-
- S1-7 Jumper for:
- Close IRQ 2 Select
- * Open * IRQ 5 Select
-
-
- S1-8 Jumper for:
- Close AT Buss Mode
- * Open * XT Buss Mode
-
-
- * W3 * ON pins 1 & 2 Enable BIOS
- W3 OFF pins 1 & 2 Disable BIOS
-
- W4 ON pins 1 & 2 Device Address 0324H
- * W4 * ON pins 2 & 3 Device Address 0320H
-
- W6 ON pins 1 & 2 R.W.C. 9 - 16 Heads
- * W6 * ON pins 2 & 3 R.W.C. 0 - 8 Heads
-
- W8 ON pins 1 & 2 Secondary Controller
- * W8 * ON pins 2 & 3 Primary Controller
-
- W9 ON pins 1 & 2 Enable Firmware
- * W9 * OFF pins 1 & 2 Disable Firmware
-
-
- _______________________________________________________________________________
-
-
- WD-27X RLL Primary Format Procedure (BIOS 62-000089-030)
-
-
- RLL Format begins at C800:0005 and requires two parameters:
-
-
- A:\> DEBUG <cr>
-
- -RAX <cr> ; AH = Drive 00 or 01 (Default = 00)
- AX 0000 ; AL = Interleave 02 to 07 (Default = 04)
- :0004 <cr> ; AX = 0004 Default
- -G=C800:5 <cr>
-
-
- _______________________________________________________________________________
-
-
- DOS v3.3 Format Procedure
-
-
- A:\> FDISK <cr> (Primary; Entire Drive; Active)
-
- < Automatic Reboot >
-
- A:\> FORMAT C:/S/V <cr>
-
- A:\> CHKDSK C:*.*/F <cr>
-
- 32 Mb Drive shows 4 Heads, 614 Cylinders, 2Kb Clusters
-
-
- _______________________________________________________________________________
-
-
- CORETEST v2.7 Benchmarks
-
-
- Drive: Seagate ST-238R Everex 32 Mb Kit $325.00 JUL-87
-
- Controller: WD1002-27X RLL BIOS: 62-000089-030 MPU: 1015E-08
-
- Computer: Bullet 286-8 Mhz BUSS: XT 4.77 Mhz BIOS: Marchand
-
-
-
- Interleave Transfer Rate Seek Track P.I. Configuration
-
- 3 27.0 Kb/sec 53.5 ms 15.6 ms 1.18 DOS 3.3 BUFFERS=18
-
- 4 26.1 Kb/sec 52.5 ms 14.5 ms 1.21 DOS 3.3 BUFFERS=18
-
- 5 25.3 Kb/sec 52.0 ms 15.6 ms 1.21 DOS 3.3 BUFFERS=18
-
- * 6 * 115.3 Kb/sec 52.5 ms 13.0 ms 1.73 DOS 3.3 BUFFERS=18
-
- 6 3276.7 Kb/sec 57.5 ms 14.5 ms 20.46 DISCACHE /D:C/M:96
-
-
-
- Review: The WD-27X RLL Controller and Seagate ST-238R Drive provide
- 32 Mb of mass storage at 55 ms for a penny a kilobyte. Data
- Transfer Rates and optimal Interleave Factors no doubt vary
- on different computers. Maximum rated Buss speed is 8 Mhz.
- An optional WD SuperBios provides dynamic Drive Table setup
- and enhanced performance.
-
-
-
- _______________________________________________________________________________
-
-
- Western Digital Corporation
-
-
- Phone Number: 1 800 847-6181 x4111 Literature Dept - Controller Info
-
- Send $25.00 with request for WD SuperBios to:
-
- Western Digital Corporation
- Attention: Technical Support SuperBios
- 2445 McCabe Way, Irvine, CA 92714
-
- Include specifications of your WD Controller:
-
- For Example: WD1002-27X BIOS 62-000089-030 MPU 1015E-08
-
- The SuperBios is part number: 62-000094-032
-
-
- _______________________________________________________________________________
-
-
- Seagate Technology
-
-
- Phone Number: 1 800 468-3472 x1 x2 Literature Dept - Drive Info
-
- Seagate Technology
- 920 Disc Drive
- Scotts Valley, CA 95066
-
-
- _______________________________________________________________________________
-
- WD-27X.DOC Steve Shelton & Jim Bready Modulator PCBoard (408) 728-5598
- _______________________________________________________________________________