[NTLK] USB to Newton Interconnect cables

[Dennis Swaney]

I might be interested; will it work if there is an USB-001 installed
already?

Sincerely,
Dennis B. Swaney

"I think, therefore I Mac"

On Sun, Feb 7, 2016 at 10:04 AM, Greg Hankins <greg at greghankins.com> wrote:

> I’d be interested in two of these.
>
>
>
> Cheers!
>
> Greg
> ____________________________
> Greg Hankins
> Happy Hank's Honey House
> Mt. Gilead, NC
> greg at greghankins.com
>
>
>
> > On Feb 5, 2016, at 9:34 PM, Anthony Morrow <anthonydmorrow at gmail.com>
> wrote:
> >
> >
> > On Feb 5, 2016, at 6:39 PM, davida at pobox.com <mailto:davida at pobox.com>
> wrote:
> >
> >> That’s actually one area I suspect I should prototype thoroughly.
> >>
> >> There are two serial ports on the Interconnect port: one using a Linear
> Technologies LT1323 line driver, one with raw CMOS levels.  The default
> port is SCC channel 0, which has the line drivers, and I’m kinda tempted to
> use that because it avoids the need for a package on the Newt to enable the
> second port (SCC Channel 3).
> >>
> >> The Interconnect doc from Apple states that the drivers on channel 0
> use RS422 signalling. I’ve grabbed a copy of the LT1323 datasheet, but
> haven’t had a chance to read it in detail yet, but … it might then be best
> to use an RS-422 driver from the USB bridge, rather than an RS-232 driver.
> The MAX driver is the default part here, but I haven’t looked at its
> datasheet yet either.
> >>
> >> So .. you’re absolutely correct to highlight this as an issue with the
> design.  Once I’ve perused the datasheets, I’ll come up with a proposal,
> and run it past the group for comment before doing a prototype to test it
> out for real.
> >>
> >>
> >>
> >>
> >> d
> >
> > My brain is foggy on this subject, but I remember connecting my Newton
> 2100 to a PC to sync Outlook items using only a interconnect-to-DB-9 cable.
> Would that had been using RS-232 since it was a PC instead of RS-422 seen
> in old Macs?
> >
> >
> > Update before I sent this. Someone wrote on the wiki page for RS-422
> that Apple used a variant that was compatible with RS-232. Maybe that is
> why the Newton worked with PCs over serial. <
> https://en.wikipedia.org/wiki/RS-422 <https://en.wikipedia.org/wiki/RS-422
> >>.
> >
> > -Tony Morrow
> > ----------------------------------------------------------------------
> >
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