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- Path: sparky!uunet!uunet.ca!kink!hugh
- From: hugh@kink.PhaedraV.On.Ca (Hugh D. Gamble)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: How Fast Can The Serial Port Go?
- Message-ID: <Jd3hs*sa2@kink.PhaedraV.On.Ca>
- Date: Sun, 10 Jan 1993 19:01:01 EST
- References: <C0CGA1.CMy@mentor.cc.purdue.edu>
- Organization: Phaedra V
- Lines: 35
-
- In article <C0CGA1.CMy@mentor.cc.purdue.edu>, Allen B writes:
-
- > I would like to talk to my LaserWriter at a faster rate than
- > 19.2Kb. I know my (Fusion-Forty retrofitted 2000)
- > computer will go faster than that and that my (NTX)
- > printer will. How fast can I get the UART or whatever to go?
-
- You can run the motherboard serial port of an accelerated A2000 at
- 115.2kbps. On an unaccelerated system MIDI speed is about the best you
- can be guaranteed to handle if everything running complies to the
- guidelines about how long interrupts should be disabled.
-
- > And then, are there terminal programs that will let me go
- > that fast as well? I mainly use my printer via a terminal
-
- Yup.
-
- > Barring that, how bad is adding another (or several more)
- > serial port(s). What are the user and programmer level
- > ramifications?
-
- That depends on the serial ports. If you add a smart board like the C=
- A2232 then there should be little CPU impact except for any overhead
- or bus contention from DMA transfers. If you add a port on an
- accelerator board it doesn't have to tie up the system bus at all. If
- you add a dumb board like the ASDG DSB or GVP I/O Extender that has a
- multi byte FIFO your CPU has longer to respond before you start losing
- bytes so you should get better performance in a busy system.
-
- --
- # Hugh D. Gamble UUCP: hugh@kink.UUCP Domain: hugh@kink.PhaedraV.On.Ca %
- # AMIX: HGAMBLE bix: hgamble voice: +1 416 267 6159 %
- # "butane everything works Finland" - autofix.el in emacs automatically %
- # correcting my mistyping of "but everything works fine". %
-
-