Re: Commodore 65 and DIN8 cable

From: Bo Zimmerman <>
Date: Tue, 1 Mar 2016 21:35:00 -0600
Message-ID: <>
On 3/1/2016 8:40 AM, wrote:
>> On 2016-03-01, at 15:22, Michał Pleban <> wrote:
>> Hello!
>> Michał Pleban wrote:
>>> I started a project to re-create the 1565 external floppy for the
>>> Commodore 65. The floppy is supposed to be attached to the computer via
>>> a mini-DIN8 cable.
>>> So I purchased a cable and stuck it into the floppy port of the computer
>>> (of course I had to solder a mini-DIN8 connector there first). The
>>> internal floppy stopped working. When I remove the cable, the floppy
>>> works again. Hmm.
>> Update: I connected the actual floppy drive to the cable and it still
>> does not work. Even with a 30 cm cable disk reads are extremely flaky,
>> from both the internal and external drive. So it is not a problem of
>> termination, and the fact that it exhibits itself on both drives means
>> that it's not a problem of the drive either. I suspect now two things:
>> (a) the disk controller in the C65 is broken (which would be strange
>> since it works on Bo's C65) or (b) maybe I did something wrong when
>> soldering the DIN8 connector. I think I need to open the computer again
>> and resolder the connector to see if it changes anything.
Can I ask what rom you are using?

This is hardly scientific, and I have no theory as to why it even might 
be so, but when I upgraded my 65 to 911001, the reliability of both my 
drives seemed to improve.

It could all have been previously loose cables, or maybe just 
all-in-my-head, but, well, it can't hurt, right?

- Bo

> Obviously I can't check this myself ;-) but if there are any EMI filtering elements on the signal's way out, those can be sometimes causing similar problems to what you describe.

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Received on 2016-03-02 04:00:11

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