Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!oberon!pollux.usc.edu!papa
From: papa@pollux.usc.edu (Marco Papa)
Newsgroups: comp.sys.amiga.tech
Subject: Re: DTR and serial.device
Keywords: serial, RS232, modem
Message-ID: <15068@oberon.USC.EDU>
Date: 31 Jan 89 22:17:55 GMT
References: <10511@well.UUCP> <15000@oberon.USC.EDU> <443@madnix.UUCP>
Sender: news@oberon.USC.EDU
Reply-To: papa@pollux.usc.edu (Marco Papa)
Distribution: usa
Organization: Felsina Software, Los Angeles, CA
Lines: 30

In article <443@madnix.UUCP> perry@madnix.UUCP (Perry Kivolowitz) writes:
|Marco's suggestion to access the CIA registers directly for toggling
|DTR is *not* a good idea for  the  following reason: No other serial
|port besides the internal one uses the CIA.
...
|Another suggestion:
|In an earlier incantation of my serial device driver I added a command
|which would allow access to all setable outputs. Something like:
|
|io_Command = CMD_SET_SERIAL_CTRL_LINES;
|io_Length  = MASK_OF_BITS_TO_BE_AFFECTED;
|io_Actual  = WHAT_TO_SET_THEM_TO;
|
|DoIO(IOB)
|
|If we all agree to make this a standard, well then, it will become a
|standard.

Perry,

I just received word from Bryce that the "standard" way to drop DTR
is to close and then reopen the device.  This should work no matter
what serial device and unit one is using.

-- Marco Papa 'Doc'

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