Technical data

Troubleshooting
4-39
DIGITAL PC 3500/5510
Code Description
54h Initialize keystroke clicker if enabled in Setup.
56h Send a command to keyboard controller to enable the keyboard.
58h Test for unexpected interrupts
5Ah Display prompt "Press F2 to enter SETUP"
5Bh Disable CPU cache
5Ch Test RAM between 512K and 640K
60h Test extended memory
62h Test extended memory address lines
64h Jump to UserPatch1
66h Configure advanced cache registers
68h Enable external cache and CPU caches
6Ah Display external cache size
6Ch Display shadow message
6Eh Display non-disposable segments
70h Display error messages
72h Check for configuration errors
74h Test Real Time Clock
76h Check for keyboard errors
7Ch Set up hardware interrupt vectors
7Eh Test coprocessor if present
80h Disable onboard I/O ports
82h Detect and install external RS232 ports
84h Detect and install external parallel ports
85h Display any ESCD read errors and initialize PnP ISA devices.
86 Reinitialize onboard I/O ports
88h Initialize BIOS Data Area
8Ah Initialize Extended BIOS Data Area
8Ch Initialize floppy controller
8Fh Count the number of ATA drives on the system
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