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: IIGS Modem Port DTR/DSR/CTS/DCD Date: Wed, 8 Feb 2017 11:35:25 -0600 Organization: A noiseless patient Spider Lines: 23 Message-ID: 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="f46986861f662a790801ea58d39884c7"; logging-data="31868"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19pUYkeWocu1cB3bpKKiBjobnCIS3wOFNY=" User-Agent: Unison/2.2 Cancel-Lock: sha1:EWuVE3KjQKCfQZ6xeqimO/Lhik8= Xref: csiph.com comp.sys.apple2.programmer:3264 Staring the IIGS modem port pin-out inside the hardware reference manual, I see that this pin-out: 1 DTR 2 HSK1 (Handshake in) 3 TX Data - 4 GND 5 RX Data - 6 TX Data + 7 GPI 8 RS Data + I'm more used to the full 25-pin pinout and am trying to understand there the following signals are used: DSR CTS DCD Is this all handled in software? m