NEC MH4500 - Manual (Page 121)

Solving Problems 5-19
POST Tests
Code Beeps POST Routine Description
54 Set key click if enabled
56 Enable keyboard
58 2-2-3-1 Test for unexpected interrupts
5A Display prompt “Press F2 to enter SETUP”
5C Test RAM between 512 and 640K
60 Test extended memory
62 Test extended memory address lines
64 Jump to User Patch1
66 Configure advanced cache registers
68 Enable external and CPU caches
6A Display external cache size
6C Display shadow message
6E Display non-disposable segments
70 Display error messages
72 Check for configuration errors
74 Test real-time clock
76 Check for keyboard errors
7A Test for lock key on.
7C Set up hardware interrupt vectors
7D Intelligent system monitoring
7E Test coprocessor if present
80 Detect and install external RS232 ports
82 Detect and install external parallel ports
85 Initialize PC-compatible PnP ISA devices
86 Reinitialize onboard I/O ports
88 Initialize BIOS Data Area
8A Initialize Extended BIOS Data Area
8C Initialize floppy controller
90 Initialize hard disk controller
91 Initialize local-bus hard-disk controller
92 Jump to UserPatch2
93 Build MPTABLE for multi-processor boards
94 Disable A20 address line
95 Install CD-ROM for boot