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From: rhebi@pnet02.gryphon.com (Roy Hebi)
Newsgroups: comp.sys.cbm
Subject: Re: VIP term
Message-ID: <20859@gryphon.COM>
Date: 11 Oct 89 08:20:42 GMT
Sender: root@gryphon.COM
Organization: People-Net [pnet02], Redondo Beach, CA.
Lines: 23

I just read the message saying that 2400 on the C64 with VIP is impossible.
Well, as I recall, I have been using the VIP for over two years now (or maybe
I have an old version). It does not support 2400 though it claims to. I
recently bought an IBM-PC, and decided to transfer about 3.5Megs of textfiles
that I have to the IBM, and I use VIP to do that. The VIP can send 2400 error
free, as far as the IBM had noticed...
 Regarding taking up 120% of the processor time, well, I wrote a 80-columns
driver that will print CBM-ASCII or regular ASCII, which prints (if scrolling
is not needed) over 1200 chars per second. This means each char takes .00083
of a second to print. 2400 bps is 240 chars per second, which are approx. 4166
clock cycles per char. My 80-columns needs 2083 clock cycles. Now, if you add
these up and lkook at the execution times of the RS-232 routines, you'll see
that it is impossible. BUT!!! I also have a source code in 6502 ML for
enhanced RS232 routines which give good 2400. And their execution times are
such that I believe that 2400 and even full-ANSI emulation is possib le.

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 Roy Hebi,

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