IBM System/23 Datamaster: Difference between revisions
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| 4Ch-4Fh || Keyboard port
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=== Timers ===
Having a 8253 PIT the computer has access to three independent programmable timers.
{| class="wikitable"
! Timer !! Function
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| Timer 0 || Baud rate generator for 8259 USART
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| Timer 1 || Beeper
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| Timer 2 || 8085 interrupt RST7.5
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