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- Newsgroups: comp.sys.amiga.hardware
- Path: news.kei.com!ub!dsinc!scala!news
- From: dave.haynie@scala.com (Dave Haynie)
- Subject: Re: A2000 serial port too slow for 28.8K?
- Sender: news@scala.scala.com (Usenet administrator)
- Message-ID: <1996Jan10.193805.11220@scala.scala.com>
- Date: Wed, 10 Jan 1996 19:38:05 GMT
- Reply-To: dave.haynie@scala.com (Dave Haynie)
- References: <4cu0t7$v3i@xensei3.xensei.com>
- Nntp-Posting-Host: gator
- Organization: Scala Computer Television, US Research Center
-
- In <4cu0t7$v3i@xensei3.xensei.com>, Pete Wason <hynoom@kersur.net> writes:
- >I didn't think so, but when I try to connect, dialer device wont
- >work... I have my serial prefs set to 31250 (where did THAT
- >number come from!?)
-
- That's for MIDI. Most modems don't speak 31kBaud. Go up to the next
- even multiple, like 38,400 Baud, and your modem will talk just fine.
-
- >19200 works great - but kind of defeats the purpose of the 28.8K
- >modem...
-
- Most modems these days can speak to the computer at a fixed rate, no
- matter what the modem's actual baud rate is. This was necessary to
- support any number of the smart modem protocols in use today, like
- intelligent speed drop-downs, compression, etc. Compressed data can
- come over at over 100KBaud with some modems.
-
- You may run into trouble with the Amiga and these higher rates, in any
- case. The built-in serial port isn't buffered. So when data comes it,
- the CPU must be able to respond to an interrupt and read it from Paula
- before the next byte comes in. This is usually better with a faster
- processor, and will depend on your graphics mode and what else the
- system is doing. 38.4KBaud is pushing it, no matter what you do.
-
- Dave Haynie | ex-Commodore Engineering | for DiskSalv 3 &
- Sr. Systems Engineer | Hardwired Media Company | "The Deathbed Vigil"
- Scala Inc., US R&D | Ki No Kawa Aikido | info@iam.com
-
- "Feeling ... Pretty ... Psyched" -R.E.M.
-
-