IBM System/23 Datamaster: Difference between revisions

@@ Line 175: / Line 175: @@
 |-
 | 4Ch-4Fh || Keyboard port
+|}
+=== Timers ===
+Having a 8253 PIT the computer has access to three independent programmable timers.
+{| class="wikitable"
+! Timer !! Function
+|-
+| Timer 0 || Baud rate generator for 8259 USART
+|-
+| Timer 1 || Beeper
+|-
+| Timer 2 || 8085 interrupt RST7.5
 |}