IBM System/370 Manual page 188

OPTIONAL FEATURES
The following optional features can be field installed unless
otherwise noted:
• High-Speed Multiply (plant installation>
• 709/7090/7094/709411 Compatibility Feature (plant installation)
• 7070/7074 compatibility Feature (plant installation>
• 7080 Compatibility Feature (plant installation>
• Buffer Expansion feature for inclusion of a 16K buffer
• Channel-to-Channel Adapter - on 2860 only
• Extended Channels (up to 12 addressable channels>
• Remote Operator Console Panel Attachment
Note: Compatibility features are mutually exclusive.
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