To use Aweb at 256 colors at Super Hi-Res Interlaced (with an A1200
accelerated 68030 and FPU), I had to step down my port speed to 38400.
That was the fastest I could set it, and have it work reliably.
jeh
On Fri, 17 Mar 2000, Holger Kruse wrote:
> 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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