[NTLK] USB to Newton Interconnect cables

David Arnold davida at pobox.com
Sun Feb 7 17:21:51 EST 2016


> On 8 Feb 2016, at 05:07, Dennis Swaney <romad at mac.com> wrote:
> 
> I might be interested; will it work if there is an USB-001 installed
> already?

I don't know which serial channel the USB-001 uses. If it's using channel 0, then it would conflict. 

Does anyone know?




d

>> 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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>>> 
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