add directory study

study/sabre/os/files/HCI/two_mice.txt

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+From: Lennart Steinke <steinke@zeus.adv-boeblingen.de>
+Subject: Two mice, one pc
+Newsgroups: rec.games.programmer
+Date: Thu, 18 Jul 1996 10:14:53 -0500
+
+Hi!
+
+Sometime ago, I tried to use two mice at the
+the same PC. It worked, and I used it for a
+tron game, and  a simple Air Hockey simulation 
+(two player only).
+
+Here's what I've done to use those two mice:
+0) Install mouse handler (com1)
+1) Save the address of the current hander
+2) Point the irq to "no handler installed"
+3) Install a mouse handler for com2
+4) Save it's address
+
+To get the mouseinformation, just swap the
+isr addresses, then use the standard mouse
+functions.
+
+Lenny
+-- 
+Lennart Steinke (steinke@adv-boeblingen.de)
+
+
+