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Groups > comp.sys.apple2.programmer > #1906

Re: Zilog 85c30 RS-422 on Apple IIGS

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On Monday, October 19, 2015 at 10:34:33 PM UTC-7, schmidtd wrote:
> On 10/20/2015 12:59 AM, John Brooks wrote:
> > I have several rj11 phonenet cables for the GS/Mac, but no ethernet bridge. I was wondering if the modern USB to rj11 converters like the one below could be used to get a direct 230k baud connection between a GS and a mac or pc.
> >
> > http://www.bestlinknetware.com/Product/150516
> 
> The GS and the SCC will signal at 230kbps, and it'll do Appletalk over 
> the serial port, yes.  Whether a modern Mac at the other end will do 
> Appletalk over serial (USB) is another matter - and I think the likely 
> answer to that is "no."
> 
> If you have a classic Mac, I *think* phonenet adapters is all you'd 
> need.  Some example setups:
> 
> http://apple2.org.za/gswv/USA2WUG/FOUNDING.MEMBERS/HOME.PAGES/EDHEL/texts/ethernet.html
> http://www.vintagemacworld.com/iigs_rb.html
> 
> > And then 2nd, if that works, can the 8530 in the GS be driven with an external clock and achieve faster point-to-point synchronous communication speeds than localtalk achieved?
> 
> I don't think so - the external clock gives you 115.2 or 230.
> 
> Some code examples:
> http://www.apple2.org.za/gswv/a2zine/Utils/Z8530_SCCsamples_info.txt
> http://adtpro.cvs.sourceforge.net/viewvc/adtpro/adtpro/client/src/prodos/serial/iigsscc.asm?revision=1.9&view=markup
> 
> I found the Zilog "User's Manual" particularly helpful to understand the 
> detailed inner workings of the SCC:
> http://www.cs.tut.fi/~kajatyo/drivers/pdf/scc_escc_um.pdf


> Whether a modern Mac at the other end will do 
> Appletalk over serial (USB) is another matter - and I think the likely 
> answer to that is "no."

Right. I would be amazed if Appletalk over USB was possible.   :)

I was just interested in high-speed serial communications between my Mac & GS. Since the GS has RS422 drivers/receivers on the motherboard, I believe it is capable of much faster speeds than RS-232.

The 8530 manual mentions the chip is capable of speeds up into the megabits and I was curious if anyone had tried high-speed point-to-point RS-422 communication on the GS, ideally with an inexpensive FTDI USB cable.

-JB

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Zilog 85c30 RS-422 on Apple IIGS John Brooks <jbrooks@blueshiftinc.com> - 2015-10-19 17:59 -0700
  Re: Zilog 85c30 RS-422 on Apple IIGS David Schmidt <schmidtd@my-deja.com> - 2015-10-20 00:09 -0400
    Re: Zilog 85c30 RS-422 on Apple IIGS John Brooks <jbrooks@blueshiftinc.com> - 2015-10-19 21:59 -0700
      Re: Zilog 85c30 RS-422 on Apple IIGS David Schmidt <schmidtd@my-deja.com> - 2015-10-20 01:34 -0400
        Re: Zilog 85c30 RS-422 on Apple IIGS John Brooks <jbrooks@blueshiftinc.com> - 2015-10-19 23:11 -0700
          Re: Zilog 85c30 RS-422 on Apple IIGS David Schmidt <schmidtd@my-deja.com> - 2015-10-20 12:25 -0400
            Re: Zilog 85c30 RS-422 on Apple IIGS John Brooks <jbrooks@blueshiftinc.com> - 2015-10-21 14:58 -0700
              Re: Zilog 85c30 RS-422 on Apple IIGS dempson@actrix.gen.nz (David Empson) - 2015-10-22 13:05 +1300
                Re: Zilog 85c30 RS-422 on Apple IIGS John Brooks <jbrooks@blueshiftinc.com> - 2015-10-21 20:32 -0700
                Re: Zilog 85c30 RS-422 on Apple IIGS dempson@actrix.gen.nz (David Empson) - 2015-10-22 20:08 +1300
                Re: Zilog 85c30 RS-422 on Apple IIGS John Brooks <jbrooks@blueshiftinc.com> - 2015-10-25 18:09 -0700
                Re: Zilog 85c30 RS-422 on Apple IIGS dempson@actrix.gen.nz (David Empson) - 2015-10-26 15:25 +1300
                Re: Zilog 85c30 RS-422 on Apple IIGS John Brooks <jbrooks@blueshiftinc.com> - 2015-10-25 20:12 -0700
  Re: Zilog 85c30 RS-422 on Apple IIGS D Finnigan <dog_cow@macgui.com> - 2015-10-25 19:05 +0000
    Re: Zilog 85c30 RS-422 on Apple IIGS John Brooks <jbrooks@blueshiftinc.com> - 2015-10-25 20:33 -0700
      Re: Zilog 85c30 RS-422 on Apple IIGS D Finnigan <dog_cow@macgui.com> - 2015-10-26 15:25 +0000

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