On Fri, Mar 17, 2000 at 11:54:41PM +0100, Iljitsch van Beijnum wrote:
> On Fri, 17 Mar 2000, Fred Wright wrote:
>
> I forgot to mention that the actual connection in this case was at 57600
> bps. The 1200 has no trouble routing between the serial port and the
> ethernet at this speed. Yet the 1200 has a 50 MHz 68060 and can't do
> 115200, while the 3000 with the original 25 MHz 68030 can (at least when
> there's no ethernet).
115200 on the built-in serial port is never 100% reliable. Whether it works
at all and how well depends on a lot of things, e.g. the exact video timing,
i.e. video mode, number of colors, horiz. frequency, overscan size and
position etc. The 030 CPU is basically fast enough for this. The limiting
factor is the latency in accessing a certain number of registers via the
chip mem bus. Also beware of "fasterblitter"-type of patches that set the
"blitternasty" bit in the blitter to speed up blitting. Any kind of operation
that causes long, consecutive chipmem DMA accesses tends to interfere with
serial i/o.
Of course if you have any software installed that Disable()s for a long
time or drivers that do a lot of work in INT6 then that may affect
serial i/o as well. In that case you may even have problems with
57600 or 38400.
--
Holger Kruse
[EMAIL PROTECTED]
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