Re: Need help finding a modem for a IIgs

[rhiggins@carroll1.cc.edu (Ron Higgins)]

In article <3aoevg$p49@nyx10.cs.du.edu/ cdeschu@nyx10.cs.du.edu (Chris Deschu) writes:
/In article <3aksov$d2g@paris.ics.uci.edu>, Orion Pax <jlee@ics.uci.edu> wrote:
/>Auri Man (aar7334@exodus.valpo.edu) wrote:
/>: You can use ProTerm and hook up at 57.6, but you won't be able to get the
/>: full vfast 116.8k (or whatever the super speed is <grin>) until someone
/>: releases a serial card for the GS that uses the new UART chip that goes 
/>: to the top speed of a 28.8 modem.  But a 57.6 connection with a 28.8 modem
/>
/>It's already been done.  The Turbo ASB serial chip upgrade by Lightning
/>Systems for the Super Serial Card.
/
/Does the turboASB upgrade for the SuperSerialCard alleviate the problem
/with the one-byte buffer on the original SSC? (Since the buffer is so
/small, the faster the serial speed, the more often the buffer data must
/be gathered and cleared, or the data is overwritten by the next byte,
/and lost.) This means that having interrupt driven code that takes up
/a lot of time will cause lost data. If this is not corrected in the
/turboASB, I don't see how the computer could possibly keep up with
/a 115kpbs connection, let alone 230... Thanks!

No, the Turbo ASB does not solve the one-byte buffer "problem" of the
original Super Serial Card.  What you say is true, the interrupt routine
needs to be very efficient or characters will be lost.

I have accomplished data transfers with the DTE rate locked at 115,200
without the loss of characters on my 8MHz Apple //e.  I have not tried
transfers at 230,400 yet.
-- 
Ron                             | Lightning Systems       | Lightning Systems
rhiggins@carroll1.cc.edu        | (414) 363-4282  200megs | P. O. Box 4 
Apple // & Van Halen Forever!   | 21.6k USR Dual Standard | Mukwonago, WI 53149
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