IBM 3 User Manual page 18

Figure 4. Installing Attachment Card
6. Press and turn the screws clockwise to tighten and secure the attachment card
7. Identify the attachment card in the printer by comparing the plug on the
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4247 Model 003 User's Guide
in the printer. You may want to use the screwdriver to complete this task.
attachment card to Figure 5 on page 9 and Table 1.
Table 1. Attachment Card Identification
Item Number in Drawing
1
2
3
4
5
Connector Type
Parallel (permanently installed)
Serial (25-pin D-shell connector)
Twinax (15-pin D-shell connector)
Coax (BNC connector)
Ethernet LAN (RJ45 connector)