114 Appendix B: Technical reference
Battery1
Used to maintain BIOS settings in CMOS memory.
Chemistry: Lithium/Manganese Dioxide (Li/MnO2) system.
Capacity: 225 mAh.
Battery voltage: 3 V.
•Diameter (max): 20 mm.
Auxiliary I/O interface
16 independent sink driver output signals and 16 independent input signals, used
to connect TTL or non-TTL devices (up to 24 V).
Input signals have interrupt generation capabilities.
Electrical specifications:
-Input signals:
Voltage range, logical “1”: 2.4 - 24 V.
Voltage range, logical “0”: 0 - 0.8 V.
-Output signals:
Logical “1”: sink to ground (100 mA maximum) fuse-protected up to 24 V.
Logical “0”: open.
1. Energizer battery performance specifications, provided by Eveready Battery Company
Inc.
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