[NTLK] Newton cable

Dennis Swaney romad at nvwisp.com
Wed Sep 19 17:31:19 EDT 2018

Ah, so basically the connection went: USB>DB9>DB25>Mini-DIN 8! I wonder how
much signal loss there was through all those connections?

Is this the DB9>DB25 adapter you mentioned:

And it looks like Monoprice has the external modem cable:

Dennis B. Swaney

"I think, therefore I Mac"

On Wed, Sep 19, 2018 at 1:52 PM, Victor Rehorst <victor at chuma.org> wrote:

> Yeah, that thing looks promising Dennis, but it's actually purpose-built
> for some other function.
> Describing cables from the 1980s and 1990s solely by their connector ends
> doesn't tell the entire story.  I could use a DB25-DB25 cable with 25
> straight-through conductors as a parallel port cable, or a serial cable,
> Back in the day, if I were in desperate need for a Newton-compatible
> serial cable, I'd ask for either a "PC serial cable for an Apple printer"
> or a "Mac external modem cable".
> "PC serial to Apple printer"* would produce a cable with miniDIN-8M and
> DB9F (but sometimes DB25F) connectors. These were for connecting an Apple
> LaserWriter's serial/LocalTalk port directly to a PC.  They were /almost/
> the correct pinout; attaching a null modem to swap the Rx and Tx pins
> around would make it work.
> The "Mac external modem cable" looked similar, but usually had a DB25 on
> one end instead of a DB9.  This is the correct pinout, and worked great
> coupled with one of those formerly ubiquitous DB25-DB9 serial port adapters
> that everyone had a dozen of.
> * (I actually used to use one of these /for an actual printer/ for many
> years, hooked to a LaserWriter NTR with a burned-out parallel port but a
> perfectly working serial port)
> -V
> On 2018-09-18 8:14 p.m., Dennis Swaney wrote:
>> Oops, you're right, Frank. Here is the pinout for that DBK-103 cable from
>> Hosa: http://hosatech.com/wp-content/uploads/2013/11/DBK-100_Pinout.pdf
>> Interestingly, the link to the cable was one that Google gave me when I
>> was
>> searching for a cable that would work with an USA-19hs.
>> Sincerely,
>> Dennis B. Swaney
>> "I think, therefore I Mac"
>> On Tue, Sep 18, 2018 at 4:33 PM, NewtonTalk <newtontalk at pda-soft.de>
>> wrote:
>> If the USB adapter you have has a DB9M connector on it then you need a
>>> MiniDIN 8 to DB9F cable like this one:
>>> https://www.adorama.com/hodbk103.html?gclid=EAIaIQobChMIivLc
>>> xMy73QIVhshkCh
>>> 2y
>>> Be aware that the Newton cable has a special wiring. I'd be surprised if
>>> the
>>> cable above has this wiring. I'm inclined to think it is wired like an
>>> old
>>> Mac modem or printer cable, which will not work.
>>> The correct wiring is described here:
>>> http://www.nsbasic.com/newton/info/technotes/cable.html
>>> http://www.jneuhaus.com/applserl.html
>>> Frank
>>> -- Newton software and hardware at http://www.pda-soft.de
>>> ----------------------------------------------------------------------
>>> http://newtontalk.net/
>>> http://twitter.com/newtontalk
>>> ----------------------------------------------------------------------
>> http://newtontalk.net/
>> http://twitter.com/newtontalk
> ----------------------------------------------------------------------
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