78 lines
3.2 KiB
Plaintext
78 lines
3.2 KiB
Plaintext
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Mindless Mayhem releases it's eigth file:
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EL CHEEPO 5.25" DRIVE FOR PS/2'S
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brought to you by The Beastmaster
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DISCLAIMER: YOU MAY ATTEMPT THIS MODIFICATION AT YOUR OWN RISK. THE
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AUTHOR IS IN NO WAY RESPONSIBLE FOR ANY DAMAGE INCURRED
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AS A RESULT OF ANY SUCH MODIFICATION.
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Interface specifications: IBM PS/2 to external 5.25" drive
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The following is a description of how to hook up an external
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5.25" diskette drive to an IBM Personal System/2 with a minimum
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of cost and components.
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The diskette interface in a PS/2 is essentially the same as in
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the older PC. The 34 pin signal and 4 pin power connectors have
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been replaced by a single 40 pin connector. In addition, output
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signals from the drive have been changed from open collector to
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tri-state. To perform the interface, connect pins 1 through 34
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from the PS/2 straight through to pins 1 through 34 of the
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external drive. Pins 8, 26, 28, and 30 also need a 10K ohm
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pullup resistor to +5 volts. Connect the power supply pins as
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follows:
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IBM PS/2 5.25" external diskette drive
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40 pin diskette drive connector 4 pin power connector
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37 ------------------------------- 2 (ground)
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38 ------------------------------- 4 (+5 volts)
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39 ------------------------------- 3 (ground)
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40 ------------------------------- 1 (+12 volts)
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A 40 pin card edge is needed to mate with the 40 pin connector
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at the B: drive slot. An IBM (old bus) prototype card or other
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suitable card with 0.1" edge contact spacing can be used if cut
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to size. Mount the pullup resistors on this board, then run the
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data and power cables from the board to your external drive.
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Try to keep cable lengths as short as possible. Don't forget to
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boot your Reference Diskette and configure drive B: as 5.25"
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external. If you're having problems configuring it as 5.25" disk,
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set it up as 1.44mb drive and see if that works. If all else fails,
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keep reading and see end of file. Also, be sure to remove the
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termination resistor(s) from your external drive if it is so
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equipped. Maybe I'll write an .ADF file. Maybe not. We'll see.
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For most of the wiring, i would stronly suggest you use ribbon
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cable; just buy a floppy drive wire cable with connectors, and cut
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off one of the two connectors, and affix it appropiatly to the card
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or whatever you use.
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The optimal interface would include additional buffering and
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shielded cable, but if you are that serious I suggest you buy
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a real computer that can handle an internal 5.25" drive.
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Note: The interface described herein has been neither approved
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nor disapproved by IBM.
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-The Beastmaster
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note: If you have any serious problems, go after this guy who
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originally came up with the idea.
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David Jaque-ass Brunell CIS ID: 74630,64
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Brunell, Webber, Smif, Jackson, Jabarr, and Associates
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P.O. Box 2751
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Palm Beach, FL 33480
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LALALALA. Hope you enjoyed another Mindless Mayhem release. Be on
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the lookout for more and be sure to call Destiny Knights, home
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board for all Mindless Mayhem releases, at 708-307-3768 NUP: Fourth
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Dimension. NO STILLWATERS WELCOME If you haven't read any
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of our other releases, you're missing out. Lates.
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. . . . . . . . . . . . . . . EOF
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