SYSTEM@UVPHYS.BITNET (NIK ZAPANTIS) (02/04/88)
After reading several digest articles on how to hook up an IBM stule
5.25" drive to the ST, I decided to try it myself.
I used a spare slimline Panasonic 5.25" drive which I tried connecting to
the ST with no success. Here is what I did in case someone could help.
1. bought an atari external floppy DIN cable and cut one of the DIN's off.
2. soldered the bare wires to a 34 pin plug that connects to the edge
connector of the Panasonic drive; here are the pin connections
ST external floppy Panasonic (IBM style)
connector edge connector
1 30
2 32
3 3
4 8
5 12
6 no connection
7 3
8 16
9 18
10 20
11 22
12 24
13 26
14 28
3. had our shop built a power supply and box for the drive
I also removed the 150 ohm resistor (near edge connector of the Panasonic).
The DS jumpers go from 1 to 4 and the jumper is put in position #2.
All other jumpers were left where they were when this drive was on an IBM XT.
I have no special software to take care of the seek rate, and I tried using
the above set up with PC ditto.
Both the ST and PC ditto cannot see the 5.25" drive, although I have installed
both drive A and B.
I get a message, when I select B, to put disk B into drive A.
Any ideas why this set up does not work?
Thank you in advance
Nik Zapantis
UVic, Physics
Victoria, BC
V8W 2Y2
(604) 721-7729
system@uvphys.bitnethase@netmbx.UUCP (Hartmut Semken) (02/10/88)
In article <8802040058.AA28448@ucbvax.Berkeley.EDU> SYSTEM@UVPHYS.BITNET (NIK ZAPANTIS) writes: >The DS jumpers go from 1 to 4 and the jumper is put in position #2. This could cause Your problem. Try all 4 settings. >All other jumpers were left where they were when this drive was on an IBM XT. >I have no special software to take care of the seek rate[...] >Both the ST and PC ditto cannot see the 5.25" drive[...] >I get a message, when I select B, to put disk B into drive A. Your 5 1/4 is not recognized; is the "in use" LED lit? No? Set DS-jumpers to #1. The LED went on for short? Hmm, sounds like the ST does not recognize the index-pulses; get Your oszilloscope and wath the lines :) hase -- Hartmut Semken, Berlin (West) (*east of West-Germany :-) hase@netmbx.UUCP ...!pyramid!tub!netmbx!hase
pes@ux63.bath.ac.uk (Smee) (02/16/88)
The answer, I believe, is that *all* Atari floppy drives think they are drive 1. This is why you don't have to muck with jumpers when you get an Atari drive, regardless of whether you are using it as a second drive, or as the first drive on an old system with no builtin floppy. The drives are 'daisy-chained', and the select lines will be crossed over inside each drive -- so that when the computer asserts 'Drive 1', the first drive responds. When the computer asserts 'Drive 2', the passthru in the first chained drive passes that to 'Drive 1 select' on its daisy-chained OUTPUT side, so that drive B sees it as a 'Drive 1 select' signal. So, if you are chaining your 5.25 inch drive in in the normal way (i.e. plugged into the back of drive A if A is external, or plugged into the back of the ST if drive A is internal, you've got to set the jumpers on the 5.25 inch drive so that it thinks it is drive 1.