Jumper Selections - IBM 1 Series Manual

Jumper Selections
Figure 6-13 showsthe location of jumpers for the DPC adapter feature
card.
Device address jumpers—
Parity option jumper— With this jumper installed, parity is checked
and generated on the data bus in and data
bus out lines
Device configuration jumpers— These two jumpers are used to
specify the device configuration
attached to the adapter card
Jumper 1 Jumper 2 Configuration
On Off 4 devices
Off On 8 devices
Off Off 16 devices
Diagnostic interrupt mask— Wheninstalled, this jumper masks off
any interrupts from devices during
external diagnostic mode
These jumpers represent the high-order address
range assigned to the adapter devices. When the
adapter is configured for four devices, the device
address from the IDCB is compared with address
jumpers 8—13. When the adapteris configured
for eight devices, the device address from the
IDCB is compared with address jumpers 8—12.
Whenthe adapteris configured for 16 devices,
the device address from the IDCB is compared
with address jumpers 8—11.
SET
an 13 12 11 10 9 8
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Ji 1 2
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Customer DPC adapter card in
ye
J3
—
\ User's connectors
Figure 6-13. Jumper selections
Customer Direct Program Control (DPC) Adapter Feature 6-21