@uref{specs/8259A.pdf, , Intel 8259A Programmable Interrupt Controller
(8259A/8259A-2)}. Datasheet for PC interrupt controller chip.
+@bibdfn{MC146818A}
+@uref{specs/mc146818a.pdf, , Motorola MC146818A Real Time Clock Plus
+Ram (RTC)}. Datasheet for PC real-time clock chip.
+
@node Software References
@section Software References