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Old 14 April 2013, 20:19   #1
Tempest 2084
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Amiga Explorer Connection Problem

I'm attempting to use Amiga Explorer to transfer files over to my Amiga 2000 but I'm running into problems setting everything up. Here's what I have everything set to:

PC (Windows 7 with a serial port card):
--------------------------------------
BPS: 19200
Data Bits: 8
Parity: None
Stop Bits: 1
Flow Control: Hardware


Amiga 2000 (WB 1.3)
---------------------
Baud Rate: 19200
Buffer Size: 8000 (had it at 4096 but it didn't work)
Read Bits: 8
Write Bits: 8
Stop Bits: 1
Parity: None
Handshaking: RTS/CTS

The setup file starts to transfer but it appears that the Amiga bails out after the first 2000 bytes or so so the SETUP file is corrupt and doesn't work. Any idea what could be wrong? I'm using a cable that I know is good so that can't be the problem. I'm so close...
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Old 15 April 2013, 03:37   #2
Cymru
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Amiga Explorer Connection Problem

You are using a null-modem cable? Or a standard serial cable?
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Old 15 April 2013, 05:16   #3
Tempest 2084
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Good question. I believe it's a standard serial cable.
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Old 15 April 2013, 16:04   #4
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Actually the more I think about it, it might be a null modem cable. I know I bought a cable specifically for doing transfers with AE so it should be the correct one.
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Old 16 April 2013, 00:28   #5
lesta_smsc
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I know this is a bit long winded, but you might just want to use multimeter and check the serial cable and its connections so you can save yourself a lot of time just in case your cable is incorrect?
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Old 16 April 2013, 00:39   #6
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Quote:
Originally Posted by lesta_smsc View Post
I know this is a bit long winded, but you might just want to use multimeter and check the serial cable and its connections so you can save yourself a lot of time just in case your cable is incorrect?
+1

Check this link for the recommended connections: http://www.amigaforever.com/kb/13-105
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Old 16 April 2013, 17:14   #7
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But if I had a bad cable, would it transfer anything at all? I'm getting some of the file, it just seems to be failing in the middle of it.

Also, how would I go about using the multimeter to test the cable?
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Old 16 April 2013, 22:30   #8
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Originally Posted by Tempest 2084 View Post
But if I had a bad cable, would it transfer anything at all? I'm getting some of the file, it just seems to be failing in the middle of it.
We're not necessarily talking about a bad cable which doesn't work at all, but a null modem serial cable which might not be wired exactly in accordance with the recommendation (I suspect that in this context 'recommendation' is a euphemism for 'requirement' ) for Amiga Explorer. There are variations which work fine for other tasks, but which might give you the problem you've reported when used with Amiga Explorer.

Quote:
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Also, how would I go about using the multimeter to test the cable?
Refer to the connection diagram on Cloanto's Amiga Explorer Null Modem Cable page which matches your cable (25-way to 25-way, 25-way to 9-way or 9-way to 9-way) and, with your multimeter set to a resistance range (Ohms), check that there is little or no resistance between the pins which should be linked according to the diagram. Then, if everything checks out fine, check that there is immeasureably high resistance between these pins and any which should not be linked to them.

If both these tests are satisfactory, then you have the right cable.
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Old 16 April 2013, 22:45   #9
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Gotcha. I'll give that a try tomorrow.
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Old 18 April 2013, 22:15   #10
lesta_smsc
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Any luck Tempest?
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Old 19 April 2013, 03:06   #11
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Just tried it tonight (been a bit busy). The cable itself says Null Modem on it but I can't test the resistance on the pins because both plugs are female and my probes are too big for the holes. I also don't see a way to get it apart easily. I do remember buying a cable specifically for this from an Amiga person, so I'm going to go with the assumption that the cable is good for now.

I did some more testing with interesting results. On a whim I decided to lower my port speed just in case the cable was flaky or there was interference somewhere. This is what I found:

19200 - File transfer quits abruptly half way through (Amiga exits to the CLI).
9600 - File transfer actually finishes and the CLI will exit with the appropriate **BREAK prompt with the Ctrl-C command. File is only 21401 bytes in length and does not work however.
4800 - File transfer actually finishes and the CLI will exit with the appropriate **BREAK prompt with the Ctrl-C command. File is only around 12000 bytes in length and does not work.
2400 - It appears that the file transfer finishes, but I can't get the Amiga to break out with the Ctrl-C command so I can't check it since the file is 'In Use'.

Any idea what to make of this? If the Amiga supported it, I'm thinking that 14400 would be the sweet spot. Still, why is it failing at the normal 19200 speed? Would starting the Amiga in a pure CLI mode help? I'm running this from Workbench 1.3.
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Old 19 April 2013, 07:05   #12
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Amiga Explorer Connection Problem

Use a small paper clip in the holes to check your cable
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Old 19 April 2013, 09:23   #13
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I am using a homebuilt null modem cable at 19200 with good (but slow) results. I also have a 2000 running 3.1 with a Blizzard 2040 card, and I have done a lot of transferring files. My null modem cable,

http://eab.abime.net/showthread.php?...ll+modem+cable

was built by me using common off the shelf parts. The nice part is I am using common pre-wired cat 6 cable, which is cheap, readily available, can be purchased in almost any length, and can go reliably much faster than the serial port on the Amiga.

I have had no problem with it.

BTW, I am using Amiga explorer also, and a Vista machine.

EDIT:

You might need to adjust some of your parameters, let me know, and I will check my machines.

Last edited by tesla; 19 April 2013 at 09:30.
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Old 19 April 2013, 16:10   #14
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Quote:
Originally Posted by Cymru View Post
Use a small paper clip in the holes to check your cable
Ahh... I'll have to try that. Never thought of that.



Quote:
Originally Posted by tesla View Post
I am using a homebuilt null modem cable at 19200 with
You might need to adjust some of your parameters, let me know, and I will check my machines.
Please let me know what parameters you're using. I'm using the ones that are stated in the instructions.
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Old 20 April 2013, 04:54   #15
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I couldn't get the paper clip trick to work. Does someone know where I can get a cheap (in the US) properly wired cable I can try just in case mine is bad?
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Old 20 April 2013, 13:48   #16
Cymru
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Amiga Explorer Connection Problem

Jameco and MCM electronics come to mind. I've seen them on eBay too +\-.

I've checked and both stores have them
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Old 20 April 2013, 13:55   #17
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Quote:
Originally Posted by Tempest 2084 View Post
I couldn't get the paper clip trick to work. Does someone know where I can get a cheap (in the US) properly wired cable I can try just in case mine is bad?
Interesting, the other option is to use a sewing needle or even a Kaynar-type wire. So much for being the quicker solution, it might have been better to build a DIY one lol
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Old 20 April 2013, 20:50   #18
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If you want to build your own cable, no soldering, no wire stripping, and plug it into almost any length cat 5/6 cable, (cheap and easy to get), see my earlier post above. It is very easy, and it works, I use it almost everyday.

Here are my parameters:

Amiga:
Baud Rate: 19200
Input buffer size: 4,096
Handshaking: rts/cts
Parity: None
Bits/Char: 8
Stop bits: 1

PC: (taken from/using Amiga Explorer)
(Connection) Serial
Port com1
Speed 19200
(Options)
Packet Size: 512
Max Retries: 50

Thats it.

One note, most pc's that have serial ports, (Either a DB-9, or DB25) have more than one com port, so if everything else is ok, you may need to try another com port

Quote:
Originally Posted by Tempest 2084 View Post
Ahh... I'll have to try that. Never thought of that.




Please let me know what parameters you're using. I'm using the ones that are stated in the instructions.

Last edited by tesla; 20 April 2013 at 22:56.
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Old 21 April 2013, 01:19   #19
Tempest 2084
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I'm using the exact same parameters. Do you think it's the cable at this point? I guess I could try that CAT 5 cable adapter. I'm kind of bummed that my cable might be bad, but at this point I can't see what else it could be.
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Old 21 April 2013, 01:26   #20
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Quote:
Originally Posted by Tempest 2084 View Post
I couldn't get the paper clip trick to work.
I always keep a couple of bare male D-Type plugs of each size (9-pin, 15-pin, 23-pin, 25-pin, etc.) to plug into the female connectors for checking the wiring of cables. Use those instead, if you have some, or maybe you have an old cable you can strip apart to remove the plugs.
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