Re: Commodore 65 and DIN8 cable

Date: Fri, 29 Jan 2016 13:17:08 +0100
Message-Id: <>
> On 2016-01-29, at 11:37, Michał Pleban <> wrote:
> Hello!
> wrote:
>> Open ended (and possibly also unshielded) wires never do any good to
>> signal quality. They are nice antennas, which will add whatever
>> electromagnetic smog flies around you to the signal but will also try to
>> radiate your signal out. None of these helps. Termination - the drive
>> should provide it, similar to what was a standard in SCSI devices.
>> Still, I wouldn't bet all of them do. I wouldn't be surprised if some
>> were cost reduced because it still worked in basic cases. How to make
>> own? Either check the older, still standard compliant implementations or
>> maybe checking the original SCSI devices?
> I suppose the Amiga drive which I will be using has some kind of
> termination, but right now I just have an open ended cable where I play
> with the oscilloscope to learn how the signals are sent to the drive...
> But this gave me an idea - measure the resistance between DISK_RD and
> Vcc or GND on the drive, maybe that will give me some idea :-)

I have a few SCSI HDDs and SCSI optical drives. In most cases the termination was done using socketed RPs aka RNs (resistor packs aka resistor nets). For mid-cable devices those were to be pulled out of their sockets. I can check those if you like too.


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Received on 2016-01-29 13:00:11

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