User`s guide

An unmodified SSC can access the external oscillator circuit via software to get
115,200 bits per second. All you have to do is dump $10 into $C0AB instead of
the $1F that's normally there.
Although not supported in many applications, the new 115k setting has been added
to ADT 1.23.
Note: Some SSC boards may need to upgrade to a later version of the 6551 ACIA
chip to function reliably at higher speeds.
______________________________
From: Kevin M. Carr
014- Could someone who has an Applied Engineering Serial
Pro card please post a list of the dip switch settings
for the 2 banks of switches?
I use an AE Serial Pro in my IIe to connect to my ImageWriter II. All of
the DIP switches are set to OPEN (switch down). The switch block next to the
printer interface connector is for hardware handshaking signals. (Copied without
any permission whatsoever from the AE Serial Pro User's Manual.)
o Switch 1, when closed, select pin 4 (Request to send) as the flow control
handshaking line. Some printers which use this line are: Data General TP2;
Heath H-25; Olympia ESW102/103; QUME Sprint 5; and Smith-Corona TP1
o Switch 2, when closed, selects pin 11 which is, according to RS-232-C
specifications, undefined and is used by some serial printers as a printer-
ready signal. Some Centronics, Texas Instruments, and Epson serial printers may
use this pin.
o Switch 3, when closed, selects pin 19 (Secondary Request to Send) as the
handshaking line. Some of the printers that use this pin are the Anadex
DP8000/9000, Bell TP-1000, Lear Seigler 310, NEC 3500/7700, and Digital
Equipment (DEC) LA-series serial printers.
o Switch 4, when closed, selects pin 20 (Data Terminal Ready) as not only the
device-available handshaking line but also as the data-flow- control line. Some
Diablo, C.Itoh, Okidata, QUME, Tectronics, or Xerox printers may use this
handshaking signal.
o When all of the switches are open, Data Terminal Ready (Dsub-25 pin 20) is
the only line monitored as the hardware handshaking line from your printer. This
supports most popular serial printers.
The second set of DIP swithces (close to the front of the card) is for
generating Maskable (IRQ) and Non Maskable (NMI) interrupts from the 6551
Asynchronous Communications Interface adapter (ACIA) chip and the 6818 clock
chip. The swithces select the type and source of interrupt request. Normally
all switches are in the OPEN position.
o Switch 1: IRQ from 6551
o Switch 2: NMI from 6551