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- From: milton@teal.csn.org (Milton Scritsmier)
- Newsgroups: comp.sys.mips
- Subject: Re: Serial Communication on RS2030
- Message-ID: <Bx82Cs.Gnt@csn.org>
- Date: 5 Nov 92 02:46:04 GMT
- References: <MexHghOSMUE2RcXKEd@transarc.com> <Bx5M22.BEK@news.cso.uiuc.edu>
- Sender: news@csn.org (news)
- Organization: Colorado SuperNet, Inc.
- Lines: 47
- Nntp-Posting-Host: teal.csn.org
-
- In article <Bx5M22.BEK@news.cso.uiuc.edu> yates@alexia.lis.uiuc.edu (Kent Yates) writes:
- >>In article <MexHghOSMUE2RcXKEd@transarc.com> Bill_von_Hagen@transarc.com writes:
- >>>Having gotten my machine up and running (thanks to many readers of
- >>>this group!), I naturally want to be able to upload/download stuff to
- >>>it, rather than writing tapes and using the tape drive. I've compiled
- >>>two different versions of kermit for it, but I've had the same types
- >>>of problems with both. I'd appreciate any help anyone could give me.
- >>>The same problems occur at 2400, 4800, and 9600. My modem is a
- >>>
- >[bunch of stuff omitted here]
- >>>
- >>>I'd appreciate any help anyone could give me. Actually, if anyone has
- >>>a working version of kermit for this machine and could send me a
- >>>uuencoded binary, along with their .kermrc file, I'd be ecstatic. I'm
- >>>running Risc/OS 4.52.
- >>>
- >
- >to which, milton@teal.csn.org (Milton Scritsmier) replies:
- >
- >>I hate to disappoint you, but the RS2030 cannot properly support
- >>modems as the proper control signals are not provided. For example,
- >>there is no RTS/CTS for hardware flow control, among other signals.
- >>The serial ports are meant for terminals only.
- >
- >>I know how you feel, I wanted to run a modem from my RS2030 too. :-(
- >
- >
- >You shouldn't need RTS/CTS to do flow control, since software flow
- >control will do the trick. The other control signals are not pertinent to
- >data transfer itself, so aside from CTS/RTS, what is it about these
- >ports that would make them fail to do a Kermit transfer, even at
- >lower baud rates?
-
- I don't know how kermit handles binary file tranfers, but I do know that
- to use zmodem with binary files you really do need RTS/CTS flow control,
- or else have the modem transfers locked at a speed that both computers
- can handle. The reason is that the Cntrl-S/Cntrl-Q characters will often
- show up in a binary transfer (consider compressed files), and lock up
- the transfer.
-
- It's not just the RTS/CTS signals. Several months ago I went through
- connecting up a V.32 modem to my home computer, and had to go get a
- 7-wire serial cable to fully support it. Unfortunately, I can't off
- the top of my head remember which 7 of the RS-232 signals are essential.
- I do know that the RS2030 serial ports don't support all these signals.
- There was a table in the release notes for RISCos 4.50 which showed
- which signals are supported by the RS2030 and other Mips machines.
-