128 lines
3.5 KiB
Plaintext
128 lines
3.5 KiB
Plaintext
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HOOKING A 5.25" DRIVE TO YOUR AMIGA
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by Les Ayling
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Hooking up a standard 80 track, double-sided, 5 1/4" floppy disk drive
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as drive df2: or df3:
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Looking at the connector from the back side of the external drive, the
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pin out is as follows:
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712 11 10 9 8 7 6 5 4 3 2 1
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23 22 21 20 19 18 17 16 15 14 13
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34 Pin edge connector pin-out is as follows:
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34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2
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33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1
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Wire a DB25 (RS-232) connector with pins 13 and 25 cut off per the
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following configuration:
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34 Pin 23 Pin
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-----------------
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34 --------- 1
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32 --------- 13
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30 --------- 2
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28 --------- 14
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26 --------- 15
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24 ---7---- 16
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22 --------- 17
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20 --------- 18
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18 --------- 19
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16 ---------
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14 --------- 9
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12 --------- 21
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10 -- tie to ground, keep the motor running all the time
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8 --------- 22
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6 --------- 20
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4 ---------
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2 ---------
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all odd numbered pins of the 34 pin connector should be tied to pins
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3, 4, 5, 6 & 7 of the 23 Pin connector (grounds).
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In addition, pin 11 of the 23 pin connector should be wired to a
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momentary push-button that can be activated whenever a diskette is
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removed and replaced with another. This tells the DOS that a different
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diskette has been inserted into the drive. Simply change the diskette,
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push the button and hold until DOS accesses the drives. The switch may
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then be released. This function is necessary due to the fact that the
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DOS seems to read the directory of the current diskette into ram, and
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unless the DOS is told of another diskette being used, it will either
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ask you to replace the diskette that was in the drive or write to the
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diskette using parameters from the previous disk. This, of course, is
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very undesirable.
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Also, note that the drive must be connected when booting DOS or it
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will not be noted as being on-line. The diskette does not have to be
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inserted, just the drive plugged in.
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Do not make any connections to the 23 pin connector, pins 23 or pin
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12. These pins provide power to the Amiga drive 1 and may not be used
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to power an external 5 1/4" drive. An external power supply must be
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used.
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The 5 1/4" drive selection header may be programmed as drive for drive
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2. Drive 1 selects as DF2: and drive 2 selects as DF3:.
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A motor on latch circuit may be built to eliminate the motor
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continuously turning, however, the way indicated above is the quickest
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and simplest method to get another drive on-line.
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After this procedure is completed, the 5 1/4" drive may be used just
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as any normal Amiga drive.
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Considering the $295.00 list price of the Amiga drives, versus about
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$50 dollar price of 5 1/4" drives, it's a real bargain.
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*** As always, with any hardware project -
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(1) - if you are not sure of what I am talking about, get
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knowledgeable help and
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(2) - TRIPLE CHECK your work before plugging in the new drive.
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|||||||||||||||||||||||| END OF ADD_5.25_DRIVE ||||||||||||||||||||||
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