Re: IIGS 115,200 Baud Serial Port - How?

["Jeff Blakeney" <jeff.blakeney@a2central.com.remove-kcw-this>]

  To: Hugh Hood
On Tue, 30 Dec 2008 23:56:02 -0600, Hugh Hood wrote:

> I suspect Greg Schaefer, when coding ProTERM, really only envisioned dial up
> modem transfers (as opposed to high speed null modem stuff), so that speeds
>> 57,600 weren't really considered.
> 
> Or, as maybe I'll find out, even ProTERM has trouble at that rate, although
> I believe at one point Greg modified the program to use the Turbo ASB Super
> Serial Card daughterboard at higher speeds. We'll see.
> 
> BTW, has anyone modified ProTERM to work with the stock (with a 65C51 for
> proper RTS/CTS handshaking) Super Serial Card using the 115,200 mode? I'm
> not sure a 1 MHz //e could keep up with a 2-way data transfer, but one with
> an 8 MHz Zip Chip sure might.

I only have ProTERM v3.0 so my port drivers all max out at 38,400 bps
but even so, I find doing null modem transfers between my IIgs and my PC
with the Zmodem protocol are faster at 38,400 bps port speed with
ProTERM v3.0 than they are at 57,600 bps port speed with Spectrum v2.3.
I can increase the transfer speed with Spectrum some by using a text
online display instead of a SHR one but ProTERM still outperforms it
because it doesn't have all the other GS/OS interrupts and
inits/CDEVs/DAs to deal with.

My IIgs currently has a ZipGS with a 28.3220 MHz crsytal so it is
running at 7.08050 MHz.

Someday I'll get around to upgrading my stuff so that my accelerator
runs faster and both those programs are up to the latest versions.  :-)