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WD1004A-WXI Dataheets PDF



Part Number WD1004A-WXI
Manufacturers Western Digital
Logo Western Digital
Description Winchester Disk Controller Boards
Datasheet WD1004A-WXI DatasheetWD1004A-WXI Datasheet (PDF)

READ THIS FIRST INSTALLATION GUIDE WD1004A-WXl Winchester Disk Controller Board FEBRUARY 1989 IDENTIFY DRIVE The WD1004A-WX1 board works with any hard disk drive that has the ST506/412 drive interface and no more than 1024 cylinders and 16 heads. The Seagate 225 hard disk drive unit is such a drive. Look in your drive manual to verify that you have an ST506/412 MFM drive or check with your dealer. Then check the drive manual for the drive parameters, such as those listed in Table 1-1. You'll n.

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READ THIS FIRST INSTALLATION GUIDE WD1004A-WXl Winchester Disk Controller Board FEBRUARY 1989 IDENTIFY DRIVE The WD1004A-WX1 board works with any hard disk drive that has the ST506/412 drive interface and no more than 1024 cylinders and 16 heads. The Seagate 225 hard disk drive unit is such a drive. Look in your drive manual to verify that you have an ST506/412 MFM drive or check with your dealer. Then check the drive manual for the drive parameters, such as those listed in Table 1-1. You'll need this information for the low level format. Table 1-1 WD1004A-WX1 Default Drive Parameters Formatted Capacity 21MB Number of Heads 4 Number of Cylinders 615 Pre–Comp RWC 307/none Step Rate 75µsec This board does not work with RLL drives. If you have an RLL drive you need either the WD1004A-27X or WD1004-27X board. 1-2 IDENTIFY BOARD Figure 1-1 shows the connector locations (J1, J2, J3, J4, and J5) on the WD1004AWXl board and the location of the jumpers (W17 to W22, R23, and W25 to W28). The (J4) drive power connector is on the WD1004A-WXl board to connect power to FileCard® drives. BIOS ROM Incompatibility BIOS is an acronym for Basic Input Output System. ROM is an acronym for Read Only Memory. The BIOS ROM is a program on a computer chip that tells your computer how to operate devices attached to your computer. Some XT compatible computers do not operate with the Western Digital BIOS ROM because of an incompatibility. Most of these computers are listed in Appendix A. Check Table A-1 on page A-11 to see if you have one of these computers. 1-3 FIGURE 1-1 WD1004A-WXl CONNECTOR AND JUMPER LOCATIONS 1-4 FIGURE 2-1. DAISY CHAIN CABLE CONNECTIONS 2–5 B JUMPERS The WD1004A-WXl board has a row of jumper posts at Wl7 to W22 and W25 to W28. Adding a jumper shorting plug or bar at any of these locations, selects a hardware configurations that is different from the default value selected by Western Digital. Thus you can change these jumper settings to match your special hardware configuration. Jumper Functions (W17 to W22, R23, and W25 to W28) The following list explains the jumper functions. · Wl7 & W18 selects factory drive tables for the first hard disk · W19 & W20 selects factory drive tables for the second hard disk · W21 and W22 select the controller and BIOS address ranges · R23 enables or disables the Western Digital BIOS ROM on the WD1004A board · W25 and W26 always OUT · W27 sets the hardware interrupt (IRQ) value for the hard disk drive · W28 allows the controller to operate with an XT computer when the jumper is OUT B–1 Default Values Tables B-1 through B-4 list the jumper settings. Default factory settings are marked with a “†” symbol. Table B-1. Pre-selected Drive Tables Table First Drive Second Drive Number W17 W18 W19 W20 0 in in in in 1 out in out in 2 in out in out 3† out out out out Capacity 21MB 10MB 10MB 21MB Heads 4 4 2 4 Cylinders 612 306 615 615 Table B-2. Select Controller and BIOS Ranges W21 W22 Controller out† in out in out†.


WD1004-27x WD1004A-WXI WD1002


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