RAMSDOpen
RAMSDOpen Open RAM I/O drivers and close a ROM Serial Driver
#include <Serial.h> Serial Drivers
OSErr RAMSDOpen(whichPort );
SPortSel whichPort ; sPortA=modem port; sPortB=printer port
returns Error Code; 0=no error
Apple no longer recommends the use of RAMSDOpen. Instead, use
OpenDriver. See About the Serial Drivers for more information.
RAMSDOpen closes the ROM Serial Driver and opens the RAM input and
output drivers for either a printer port or a modem port. It should only be
used on machines with 64K ROMs.
whichPort is the parameter that identifies the port as being either the modem
port or the printer port.
Returns: an operating system Error Code. It will be one of:
noErr (0) No error
openErr (-23) can't open driver

Notes: RAMSDOpen determines the kind of Macintosh being used and chooses the
appropriate RAM Serial Driver.