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From: hamilton@uiucuxc.CSO.UIUC.EDU
Newsgroups: net.micro.amiga
Subject: Re: Picking a terminal emulator
Message-ID: <148600124@uiucuxc>
Date: Tue, 12-Aug-86 17:20:00 EDT
Article-I.D.: uiucuxc.148600124
Posted: Tue Aug 12 17:20:00 1986
Date-Received: Thu, 14-Aug-86 21:14:56 EDT
References: <232@neoucom.UUCP>
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Nf-From: uiucuxc.CSO.UIUC.EDU!hamilton    Aug 12 16:20:00 1986


>>1) Use the SDCMD_QUERY for the serial device, to find out how many
>>   characters the device has waiting, then get exactly that number.
>>
>
>Do you mean that I can open up my ports to the serial device and do an
>SDCMD_QUERY without having done a SendIO or DoIO first, and it will tell
>me how many characters it has in its read buffer?

    SDCMD_QUERY is an i/o command just like READ, WRITE, or SETPARAMS,
so you would do a DoIO() with io_Command = SDCMD_QUERY.  the resulting
io_Actual is the number of bytes ready to read (like ioctl FIONREAD,
if you know what i mean).

>>AmigaTerm (our terminal program, soon to be shipped with the modem
>>for the Amiga, and maybe seperately) has a slightly higher throughput
>>than a DEC VT101 (but slightly lower than a CIT-101).
>
>I'm not sure this is all that impressive (sorry, Andy).  A VT100 has only
>a 64 character buffer, which fills up pretty quickly at 9600 baud.  The
>real question is, what is the maximum baud rate for which AmigaTerm doesn't
>need flow control?

    that could depend... unlike the vt100, the amiga has many kilobytes
available for buffering.  use enough, and even long bursts of data won't
overrun before statistics average the rate down.  just set the io_RBufLen
field while you're setting baud rate, etc, in a SDCMD_SETPARAMS.  default
is 512, so there's plenty of room for improvement there.

	wayne hamilton
	U of Il and US Army Corps of Engineers CERL
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