/************************************************************************/ /* */ /* How to SCSI daisy chain multiple SCSI devices using a Supra */ /* DMA -> SCSI interface */ /* */ /* Copyright 1987 Supra Corp. */ */ /* */ /************************************************************************/ WARNING: To the best of our knowledge, the information presented here is correct. However, Supra Corp does not assume responability for any errors in this document. Supra Corporation does not assume any liability for damages resulting from the use of this information. If after reading these instructions, you have any doubt in your ability then you should seek professional help from a computer service center or experienced friend. This document and its pictures maybe freely distributed, as long as all files are kept together. (ALLCONT1.PI2,ALLCONT1.PI3,ALLCONT2.PI2, ALLCONT2.PI3,CONTROL.PI2,CONTROL.PI3,SCSI.TXT) Supra Corp retains its full copyright privilages. This document describes how you can add multiple SCSI devices to the Supra ST DMA -> SCSI interface. If you have purchased a Supra hard drive, this interface is packaged with your hard drive. Or you must have purchased our interface. THIS WILL NOT WORK ON OTHER COMPANIES ST DMA -> SCSI INTERFACES!!! We will sell the SCSI extension cable, with all connectors, for $24.95. You can also order ADD ON SCSI drives for: Prices as of 6/1/87: 20M ST 599 30M ST 799 60M ST 1495 You can contact us at: Supra Corporation 1133 Commercial Way Albany, OR 97321 503-967-9075 main number 8-5 pst 503-967-9081 tech support 8-5 pst 503-926-1980 Supra BBS 24hrs 300/1200 TELEX - 5106005236(Supra Corp) You can contact us via the following services: CompuServe - 76004,565 Delphi - Supratech GEnie - Supratech BIX - supracorp We are active on CompuServe in the ATARI16 and ATARIDEV SIG sections We also have a Supra message base set aside for us on the ATARIDEV SIG, mesage area 12. We are on Delphi in the AtariForum SIG. We are on GEnie in the AtariST SIG. We are active on BIX in the ATARI.ST SIG, plus we have a vendor support area which is called SUPRA.CORP. DISASSEMBLY: 1. Disconnect the power cable and the DMA cable to your ST. 2. Remove the screws from the hard drive case. 3. Slowly lift the top of the case up and to the side, be carefull of the LED wires. You can push the LED's out of their holders. 4. Refer to FIGURE 1. The Supra interface will be on top. It will have a 50 pin SCSI cable which will connect to a 50 pin SCSI connector on the hard drive or hard disk controller. You should remove the 2 screws from the interface to allow more room to work. ASSEMBLY: 1. You will need from 2 feet to 6 feet of 50 pin ribbon cable. 3 50 pin connectors and a SCSI controller/hard drive. 2. Refer to FIGURE 1. On one end of the connector you need to connect one of the 50 pin connectors. This will connect to the Supra ST DMA interface. The next connector will be placed 4-12 inches from the 1st connector. This connector will connect to the 1st SCSI device. At the end of the cable place the last connector. This connector will connect to the 2nd SCSI device. NOTE: You need to double check that you are connecting pin 1 to pin 1. The stripe on one side of the 50 pin cable should be connected to pin 1 on each connector. NOTE: Some SCSI controllers have termination power from the board or termination power from the SCSI bus (pin 26). Other SCSI controllers do not allow you to set this. If you have termination power from the SCSI bus, you will need to disconnect pin 26. The best way to do this is to cut pin 26 in the 50 pin ribbon cable which you have made in the step above this note. You would make the cut between the 2 SCSI devices. Please refer to your SCSI controller manual and to Appendix A. 3. Disconnect the 50 pin connector from the Supra ST DMA interface, note pin 1 orientation, disconnect the 50 pin connector from the Supra hard drive/controller, again note pin 1 orientation. Connect the new cable that you have made as per FIGURE 1. Double check that you have pin 1 connected to pin 1. 4. Pull out the terminator packs from the Supra hard drive/controller and the 2nd SCSI device per your manual and per the suggestions in Appendix A. NOTE: The SCSI standard calls for the termination packs to be pulled on all but the last drive. Our tests indicate that the termination pack should be in for the drive nearest the Supra interface. The other SCSI devices may or may not need to have the terminator packs. This may also be affected by the cable lengths between SCSI devices. A longer SCSI cable will be more likely to need termination. We have suggestions for this in Appendix A, you may also need to use trial and error. 5. Set the SCSI selector of the 2nd SCSI controller/drive to number '1'. To do this refer to your manual and to Appendix A. 6. Remount the Supra ST DMA interface. 7. Put the case back on, if you pushed the LED's out, you should reinsert them. 8. Reconnect your Supra drive to the power and ST. 9. Connect your 2nd drive in. Power everything up. FORMATTING: 1. Run the program 'SUPFMT.PRG' 2. Click on the box which says 'SCSI 0 LUN 0' 3. Set the SCSI device number and LUN number of the drive you want to format. NOTE: The SCSI device number and LUN number is the address of a particular drive. The SCSI devices can range from 0-7, the LUN's 0-1. ie. The first drive would be SCSI 0 LUN 0, and if you had a controller next, the 2nd drive would be SCSI 1 LUN 0 and the 3rd drive (if hooked to the controller) would be SCSI 1 LUN 1. 4. After setting the SCSI,LUN, the drive will be accessed to read some information. You should check for this to be sure that you are going to format the correct drive. 5. Format the drive. PROBLEMS: If you can not access the drives properly, here are some things to check for: 1. If one of the drives will not power up anymore, then you most likely have blown a fuse due to pin 26 having power. Replace the fuse and cut pin 26 loose. See NOTE above for more info. /************************************************************************/ /* APPENDIX A */ /* This appendix has some valuable info on particular controllers. */ /* Please refer to FIGURE's B & C */ /************************************************************************/ NOTE: If a drive SCSI selection is refered to as 'binary', then please refer to this chart: SCSI SELECTION (Jumper on pins) SCSI ID Pin 0 Pin 1 Pin 2 0 1 X 2 X 3 X X 4 X 5 X X 6 X X 7 X X X 20M RODIME RO 650 (Intergrated hard drive) SCSI SELECTION (Jumper on pins) 1-2 3-4 5-6 DRIVE ID 0 X 1 X 2 X X 3 X 4 X X 5 X X 6 X X X 7 /************************************************************************/ 20M MINISCRIBE M8-SCSI (Intergrated hard drive) SCSI SELECTION is binary /************************************************************************/ 20M SEAGATE ST225N SCSI SELECTION is binary /************************************************************************/ ADAPTEC AC-4000/AC-4070 SCSI SELECTION is binary, (A-B = 0, C-D = 1, E-F = 2) /************************************************************************/ OMTI 352xA SCSI SELECTION is binary, (W1 = 0, W2 = 1, W3 = 3) SCSI power termination is set by W14 as: 1-2 = Termination power from board (default) 2-3 = Termination power from SCSI bus /************************************************************************/ XEBEC S1410 SCSI SELECTION is set by shorting the pad 'S' to the SCSI number number pad. From the factory it is set to 0 by a trace running from pad 'S' to pad '1'. You would need to cut this trace, then connect between the required number and pad 'S' SIZE SELECTION is set by 'W3', for 512 byte sectors you need the jumper set to 'ss' and '5'. /************************************************************************/ XEBEC S1410A SCSI SELECTION is set by repositioning the jumper. SIZE SELECTION is set by 'W1', for 512 byte sectors you need the jumper set to 'ss' and '5'. /************************************************************************/ WESTERN DIGITAL 1002S-SHD SCSI SELECTION is set by repositioning the jumper at 'W1'. SIZE SELECTION is set by 'W2', for 512 byte sectors you need the jumper set to '2' and '3'.