Path: csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: ultramagnus_tcv Newsgroups: comp.sys.apple2.programmer Subject: Re: IIGS Modem Port DTR/DSR/CTS/DCD Date: Sat, 11 Feb 2017 06:39:41 -0600 Organization: A noiseless patient Spider Lines: 26 Message-ID: References: <3d311d59-8371-4080-b345-1c17d1cd7dab@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Injection-Info: mx02.eternal-september.org; posting-host="b3658bc8d758e92d02ac1edd3fb53493"; logging-data="8751"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+U+cExdIdSYbcTXlcppAUUAEIQclxwed8=" User-Agent: Unison/2.2 Cancel-Lock: sha1:l2HIJNCS4fWnUzAcZyVxnisQj9o= Xref: csiph.com comp.sys.apple2.programmer:3268 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.