IBM 1 Series - Pin Assignments Showing Customer Access Panel (CAP) Connections; Jumper Selections; Timer Feature Design Considerations; Wiring Practices

Pin Assignments Showing Customer Access Panel (CAP) Connections
If the customer access panel (CAP) feature (#1590) is ordered, the cable
from the top-card connector (TCC) is built-in and connected as follows:
Timer 0 Timer 1
TCC CAP TCC CAP
Name pin pin pin pin
Customer clock + AOl A BO8 U
— AO0S5 E B04 Y
Shield Frame K Frame C
External gate + A02 C BO7 S
_ AOS H B04 W
Shield Frame M Frame A
Run state + AO3 B B06 Vv
— AO5 F B04 Z
Shield Frame L Frame D
External gate
enable + A04 D BOS T
—
AOS5 J B04 x
Shield Frame N Frame b
Jumper Selections
Refer to Figure 3-3 for the jumpers required on the timer card for the
external signal lines and device addressing.
Timer Feature Design Considerations
Wiring Practices
All signals brought into the top-card connector must be via twisted-pair
wires. The signal ground wires from all sources associated with a particular
timer must be soldered together at the connector card and brought into
timer O or timer 1 on pin AQ5 or BO4, respectively.
The voltages and grounds associated with the drivers, receivers, and filter
are isolated from the timer voltages and grounds used for the timer card.
This isolation decouples external circuit noise from the digital voltages and
grounds for the timer card.
A single ground strap must be connected from A0OQ8 on the top-card
connector to a suitable frame ground on the card file.
Application Notes
The cable connecting the user’s lines to the timer card is made with a
Berg* connector part number 65405-005 (or equivalent).
The pins are Berg part number 75598-003 (or equivalent) and the
recommended wire is #24 AWG twisted-pair wire.
* Berg Electronics, Division of E.I. duPont de Nemours & Co., Inc.
3-12 GA34-0033