IBM 8270, Installation And Service Manual

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Installing the Token-Ring Processor Card (8270-800 Only)
When removed from its package, the 8270-800 chassis has two open slots in the
faceplate. See Figure 2-1.
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Figure 2-1. The 8270-800 As It Is Shipped.
The open slot on the left is for the token-ring processor card. Follow these steps to
install the token-ring processor card.
Chapter 2. Installation
2-3