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Groups > comp.sys.apple2.programmer > #3268

Re: IIGS Modem Port DTR/DSR/CTS/DCD

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On 2017-02-10 03:30:05 +0000, Hugh Hood said:

> Mike,
> 
> It appears the Tech Note had what you needed, but in a nutshell, the 
> IIGS really only has one pair of handshake lines 
> [HSKout/HSKin](excluding GPin), whereas an RS-232 25-pin device 
> connector has at least two pairs of handshake lines [DTR/DSR and 
> RTS/CTS] plus DCD.
> 
> So, you select which pair of device handshake lines you want to use (or 
> jumper between them - several ways to do that) and route those to the 
> GS' HSKout/HSKin lines.
> 
> Modems usually supply a 'DCD' line for 'carrier detect', and that is 
> routed to the GS' GPin line, which will be detected by software that 
> uses this line, which is generally terminal programs.

Thanks for explaining it. The graphics on that tech note also make it 
pretty straightfoward to follow. :-)

I've recently got Warp 6 functioning on my IIGS with tcpser. One thing 
I'd like to solve is helping Warp6 detect a lost carrier. It's a bit 
mind-bending with the null in place, but I'm hopeful to trace out the 
lines and make a custom cable. 

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IIGS Modem Port DTR/DSR/CTS/DCD ultramagnus_tcv <mikew@thecomputervalet.com> - 2017-02-08 11:35 -0600
  Re: IIGS Modem Port DTR/DSR/CTS/DCD roger.shimada@gmail.com - 2017-02-08 19:39 -0800
    Re: IIGS Modem Port DTR/DSR/CTS/DCD ultramagnus_tcv <mikew@thecomputervalet.com> - 2017-02-09 11:36 -0600
      Re: IIGS Modem Port DTR/DSR/CTS/DCD Hugh Hood <hughhood@earthlink.net> - 2017-02-09 21:30 -0600
        Re: IIGS Modem Port DTR/DSR/CTS/DCD ultramagnus_tcv <mikew@thecomputervalet.com> - 2017-02-11 06:39 -0600

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