AT&T 3B2 Off-Line Diagnostic Manual page 144

Version 3 Hardware System Board Diagnostics - - - - - - - - - - - - - - - - - - - - -
Test Numbers': 4 through
11
Function: These tests check that each of the tested bits in the CSER generate an interrupt
and that the CSER reflects their being set.
Procedure: These tests loop through each of the bits tested, confirming that an interrupt
was taken and that the CSER accurately reflects the bit being set in the
interrupt handler.
Hardware Tested: The Interrupt System and CSER are tested.
Data Returned: The contents of the CSER read from the interrupt handler is returned.
Notes: None
Test Number: 12
Function: This test checks that a Level 13 interrupt is generated when the B side of the
Dual Universal Asynchronous Receiver/Transmitter (DUART) issues an
interrupt request.
Procedure: The B-side DUART is set, and the Interrupt register is loaded with an interrupt
request. A Level 13 interrupt is taken and the CSER accurately reflects a
pending Universal Asynchronous Receiver/Transmitter (UART) interrupt
request status.
Hardware Tested: The Interrupt System, DUART, and CSER are tested.
Data Returned: The contents of the CSER as read from the interrupt handler is returned.
Notes: None
Test Number: 13
Function: This test checks that a Level
11
interrupt is generated when the Floppy Disk
Controller issues an interrupt request.
Procedure: The Floppy Disk Command register is loaded with a force interrupt command
and a Level
11
interrupt is taken.
Hardware Tested: The Interrupt System and Floppy Disk Controller are tested.
Data Returned: The contents of the CSER read from the interrupt handler is returned.
Notes: None
3-104 OFF-LINE DIAGNOSTIC MANUAL