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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: vinyi on June 10, 2005, 03:22:27 PM
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Hi There,
I would like to find information about how to connect a standard amiga FDD to my Ami's external disk drive port.
The internal drive would stay in its place, so the external would be DF1.
Found pinouts on the net, but not sure which pins should be connected or do I need to make some electronics.
Thanks in advance!
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from memory you will have to create a small cicuit if you want it to be able to detect which drive it is (eg.DF0: or DF1:).
I did it once, bit of a task unless your good with a soldering iron. However it was a long time ago so I don not remember that clearly.
good luck, getting floppy drives to work how you want them to can be hard.
:pint:
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Thanks, I wonder if someone could help me finding that circuit. Even some keywords to search the web could help me.
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Thanks, I wonder if someone could help me finding that circuit. Even some keywords to search the web could help me.
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i was once make it for cdtv drive, i think its on aminet in hack directory, mazby it helps too:
----- from http://www4.ncsu.edu/~hgm/amiga/altdskdrvs.txt -----
This will make the original internal think that it is now df1:
2) There is a jumper just beneath the ribbon cable (for the floppy drives) just
as the ribbon comes out of the motherboard. You must dig up your own jumper and
slide it down over the two "pins" here (this is jumper J301 next to connector
CN 303 as shown on page F-12 of the Amiga 2000 Schematics in the "Introduction
to the Commodore Amiga 2000" book that everyone gets with their Ami).
or look on that link
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If ya can't find it, lemme know, and I'll crack my external A500 drive open and see if there's any circut boards in there.. If there is and it's simple, could always take photos/document marked parts, etc... This being a last resort kinda thing, of course :) This like a project/goal thing for ya, or do ya not wanna search ebay for external drives? :)
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Yesterday I made my cable and it is not working good. The internal and external drives' motors are spinning together and only the internal one can be seen in dos as ussual.
I've connected the corresponding pins plus the external port's 'select drive1' pin to the drive's 'SD1' and jumpered the drive to act as DF1.
Rooster, please look into your drive and tell me what you can see inside. It would be highly appreciated...
Thanks!
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I'm still fiddling about with my floppy drive problem, so this is familiar to me currently.
The only time I have seen both drives spinning together is when the drives are on the same DSx assignment. That is DF0: should be set to DS0: and DF1: to DS1.
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Lots of fun ahead. I have been mucking about with mine on and off for too long. Mine are internal PC floppy drives which are not quite the same as what your dealing with.
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Fun, yeah!
I've tried my cable without any connected SD line and still spinning together. Curious...
Here's how my cable looks like:
AMIga external port /// amiga floppy drive
1 RDY ---> 34 RDY*
2 DKRDY* ---> 30 DKRD
3..7 GND ---> every odd pin
8 MTRXD* ---> 4 MTR0D*(led)and/or 16 MTR0D*
9 SEL2B ---> NC
10 DRESB ---> NC (no pin like this on the drive)
11 CHNG ---> 2 CHNG
12 +5V ---> +5V in on floppy
13 SIDEB ---> 32 SIDEB
14 WPRO ---> 28 WPRO
15 TK0 ---> 26 TK0
16 DKWEB ---> 24 DKWEB
17 DKWDB ---> 22 DKWDB
18 STEPB ---> 20 STEPB
19 DIRB ---> 18 DIRB
20 SEL3B ---> NC
21 SEL1B ---> 12 SD1
22 INDEX ---> 8 INDEX
23 +12V ---> NC
also connectted amiga GND to -5V pin on floppy.
Possible problems:
- My drive has a jumper DF0/DF1 tried every position with mixed SEL1B,SEL2B connected to SD0, SD1 (which is pin 12 on the FDD)
- can't connect Amiga pin 10 Disk Reset since there is no pin like this on the FDD
- on the FDD there are two pins MTR and LD, which are pin 4 MTR0D (led) and 16 MTR0D in the hardware manual. There is only one pin on the amiga, the pin 8 MTRXD, which could be connected to these. But which one?
The pinouts of the two port are:
Amiga external:
1 RDY* 13 SIDEB*
2 DKRDY* 14 WPRO*
3 GND 15 TK0*
4 GND 16 DKWEB*
5 GND 17 DKWDB*
6 GND 18 STEPB*
7 GND 19 DIRB
8 MTRXD* 20 SEL3B* A2000 not used (1)
9 SEL2B A2000 SEL3B* (1) 21 SEL1B* A2000 SEL2B* (1)
10 DRESB* 22 INDEX*
11 CHNG* 23 +12V
12 +5V
(1) SEL1B* is not drive 1, but rather the first external drive. Not all
select lines may be implemented.
Internal Disk Drive Header
Pin Description Pin Description
1 GND 18 DIRB
2 CHNG* 19 GND
3 GND 20 STEPB*
4 MTR0D* (led) 21 GND
5 GND 22 DKWDB*
6 N.C. 23 GND
7 GND 24 DKWEB*
8 INDEX* 25 GND
9 GND 26 TK0*
10 SEL0B* 27 GND
11 GND 28 WPRO*
12 N.C. 29 GND
13 GND 30 DKRD*
14 N.C. 31 GND
15 GND 32 SIDEB*
16 MTR0D* 33 GND
17 GND 34 RDY*
Anyone pleeeezee help! :-x
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Wow,
Before I even begin to try and follow all that stuff, can you tell me what the brand name of the external drive your trying to fit? Is it a Chinon or Teac or other...
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Ye Ye we ned that typo :-D
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It's a normal EPSON SMD 400 internal amiga DD drive.
Anyway, I can swap my internal CHINON to this and try the CHINON as DF1. Both of these drives working fine alone as an internal drive. Maybe they don't like each other???
I can't believe, I've been searching the net for a week now, and could not find any document that describes how to mak your own external drive especially how to connect the drive select lines. No hack, no PC to Amiga stuff, just a standard Ami disk to the external port what I need.
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Okies - I'll crack it apart tomorrow and get some pics up on a website and link ya.. As well as the obvious mentioning in here as to whether there'a an PCB's inside!
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Wow thanks Rooster!
Looking forward to see those pics!
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There is in fact a board that the cable hooks up to.. I'll post a link to the pics in a few. Pretty small/easy board, from the looks, but certainly not a straight-through connection.
I submitted the photos to the website here, in the Assorted Hardware and Monitors section, but I'm guessing they have to be approved since they aren't showing up yet..
So, check out http://www.lanfest.dyndns.org/a1010/ for a direct link to the photos (note for archival purposes this will not be a perminent link, only temporary till they get accepted here...)
There four components, not counting connectors on the PCB:
PR1: A resistor network - The hardest to describe, so the last two shots on my website detail the writings on it. To me, looks like: 5X102J, which I though would be a 102 (1000ohm) 5 pin network, however there's 6 pins.. Maybe the 6th is the main power into it, then 5 outs... *Note I did not send these pics to the site here, just on my temp. location.
U1: 7300E1 (fab/datecode)
M74LS74AP
U2: 735400
M53238P
C1: 10.4%
50 V
I can provide more, detailed pics of the board alone, if you are going to try and recreate one.. I don't mind one bit, just didn't do it yet as I'm lazy, and not a fan of excessive work if it's unnecessary :)
Interesting sidepoint.. The ribbon cable that attaches from the PCB to the floppy - There is a second header for a ribbon cable right behind the one in use.. Possibly a dual external was in their minds??
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Hi,
Thanks Rooster for the valuables.
I would recereate that PCB if I knew exactly what to build into it. That resistor network makes me feel that it will be a hard to get one.
There's a guy in our city (Budapest) who makes this kind of cable but he said he don't put any intelligent stuff into it, just pure cableing - which he keeps in dark secret of course....
I would make that PCB if knew that it won't cost more than an external drive.
Anyway, thanks again folks!