🚀 go-pugleaf

Peter Ceresole <peter@cara.demon.co.uk> wrote:

> In article <1dfpypm.1s99uwsjkicx8N@roxley.demon.co.uk>,
> mark@roxley.demon.co.uk (Mark Etherington) wrote:
> 
> >You can get ISDN Terminal Adaptors which connect to the serial port as a
> >modem would. I believe they don't allow for as much throughput as an
> >ISDN card, but they are considerably cheaper.
> 
> As a matter of interest; as ISDN tops out at 128KBps (assuming you use both
> channels) and there is no compression standard for it, and most Macs these
> days can talk to devices on the serial port at 230Kbps,

Not `most': all Macs these days can, assuming you're using software that
can get round the 57600 bit/s software limit in the Macintosh Toolbox
that afflicts non DMA serial port Macs.  My non DMA serial port Performa
475 is quite happy running its serial port at 115200 bit/s; all you need
is twice the bus capacity and twice the processing power to guarantee
that 230400 bit/s is fine.  My 475 has a 25MHz system bus.  Are there
any current Macs without at least a 50MHz system bus and twice the
processing power of a 25MHz 68LC040?

> wouldn't the "TA
> modems" in practice be just as good? 

They *ought* to be, but who knows?

Rowland.

-- 
Remove the animal for my email address:   rebecca@astrid.dog.u-net.com
Sorry - the spam got to me.                       PGP pub key A680B89D
UK biker?                    Join MAG and help keep bureaucracy at bay
                          http://dredd.meng.ucl.ac.uk/www/mag/mag.html