On Wed, 12 May 1999, Bill Studenmund wrote:

> On Wed, 12 May 1999, Thor Lancelot Simon wrote:
> 
> > On Tue, May 11, 1999 at 03:06:58PM -0700, Jonathan Stone wrote:
> > > 
> > > Thor, why on earth do you say that? There's, what, a 3-byte fifo, and
> > > 57600 bits/sec at 1 start bit and 1 stop bit comes out under 2k
> > > interrupts/sec.  Not at all outrageous for a 25Mhz r3000.
> > 
> > Isn't it the 85230 that has the 3-byte FIFO, and the plain 8530 with just 1
> > byte?
> 
> Nope, the 8530 (and 85C30 and 85C80) all have a 1-byte transmit fifo and a
> 3-byte receive fifo. The 85230 has a fatter receive fifo at 8 bytes, and
> has the ability to interrupt after either 1 or 4 bytes are received. I
> think the transmitter's 3 bytes deep.
> 
> Take care,
> 
> Bill
> 
> 

Actually the xmit buffer on the '230 is 4 bytes...

I was just about to throw out that SCC users manual, maybe I'll keep it
another year...

	I have a hardware question of my own... Is the 1024X864 resolution
of the DS3100 hardware determined? (ie a PAL) or can it be changed? 60Hz
refresh is kinda painful and 1024X768 at 66 Hz would be much nicer. If
changing the reolution is not possible, has anyone ever tried changing the
69 Mhz oscillator to bump up the refresh rate?

Peter Wallace
Mesa Electronics