From: wirehead@thedeck.Eng.Sun.COM (Mark Koch)
Subject: TECH:  SEGA to SPARCstation (Notes...)
Date: 4 Jun 1992 00:08:10 GMT
Message-ID: <l2qnnaINN26l@exodus.Eng.Sun.COM>
Organization: Sun Microsystems



Thanks to Dave Stampe for his insite on how the LCDs work.

It turned out that my problem resulted from the fact that
the SPARCstation has two jumpers on the CPU board to select
the voltage level on the serial ports.  The standard setting
is a +/-5 volt swing(RS-423 mode) on the serial port.  By moving the jumpers,
(you'll need to cut two traces and solder two jumpers on the original
SPARCstation 1 board),  the voltage levels will be changed to
+/-12 volt levels (RS-232 mode) needed to drive the SEGAs.

Remember to check the "SPARCstation installation guide" under
"Serial Port Mode Selection" for more details.

The results were spectacular!!!


Mark Koch