Digital Equipment DEC 3000 600 AXP, Service Information

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SCC Diagnostic
Subtests
Table 4–16 lists the diagnostic subtests.
Table 4–16 SCC Diagnostic Subtests
Subtests Description
INIT Performs a reset on both SCC controllers
POLLED Tests SCC controllers using polled I/O
INTERRUPT Tests SCC controllers using interrupt driven
I/O
DMA Tests SCC controllers using DMA transfers
LK401 Tests for presence of a keyboard
MOUSE Tests for presence of a mouse
MODEM
1
Tests modem control signals
? Lists the subtests.
1
Requires modem loopback (PN 29-24795). Testing in service mode, DIAG_
SECTION 2.
Error Reporting All reported errors contain a hexadecimal longword of data and a
FRU code to identify the failing FRU.
When the diagnostic encounters an error, the error reporting
procedure format is as follows:
>>> T SCC
?? 003 SCC
XXXXXXXX
Table 4–17 describes the diagnostic error message and the FRU
that needs to be replaced.
Table 4–17 SCC Error Identification
Identifies
Test Failed
FRU Code Failing Test Error Code Replace
?? 002 SCC See
Chapter 14 I/O
Module
?? 003 SCC See
Chapter 14 Keyboard
?? 004 SCC See
Chapter 14 Mouse
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