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- Path: news.uni-c.dk!news
- From: i5061@dc.dk (KRistian L. Madsen)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: A1200 serial port speeds?
- Date: Tue, 09 Jan 1996 22:16:14 GMT
- Organization: News Server at UNI-C, Danish Computing Centre for Research and Education.
- Message-ID: <4ctpf4$eau@news.uni-c.dk>
- References: <4csf14$7h8@candelo.dpie.gov.au>
- NNTP-Posting-Host: d3tl0305.dc.dk
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-
- "Antti J. Roppola" <ajr@henric.nric.gov.au> wrote:
-
- >Now I know that a stock 1200 can't keep up with a 28.8 modem since the '020
- >isn't fast enough, but how about a 1200 with a 50MHz '030?
-
- >Will a 28.8 modem run at full capacity, or would the serial port become the
- >bottleneck instead of the CPU?
-
- >TIA,
-
- >Antti
- >_______________________________________________________________________________
- >"We're a garage band, we come from garage land" - The Clash
-
- Well, if the CPU is a bottleneck with a 28.8 modem, your CPU is
- running :
-
- (28.8Kbit/s) / (32 bit) = 900 Hz or 0,0009 MHz
-
- My CPU is running 14,7 MHz (or something like it) and can move :
-
- 14,7 * 1.000.000 MOVE-instructions/s * 32bit = 470.400.000 Bit/s or
- 470.400Kbit/s !!!!!
-
- The above calculations don't consider bus-speed and memory speed.
-
- When you're taking I/O the CPU is never the bottleneck, when you're
- talking communication the CPU is NEVER NEVER NEVER the bottleneck!!!!
-
- Regards,
- Kristian L. Madsen
- IBM > SYS:TRASHCAN
-
-