NEC MH4500 manual Reset Programmable Interrupt Controller

		POST Tests
Code	Beeps	POST Routine Description
1C		Reset Programmable Interrupt Controller
20	1-3-1-1	Test DRAM refresh
22	1-3-1-3	Test 8742 Keyboard Controller
24		Set ES segment register to 4 GB

281-3-3-1 Autosize DRAM; system BIOS stops execution here if the BIOS does not detect any usable memory DIMMs.

2A		Clear 512K base RAM
2C	1-3-4-1	RAM failure on address line xxxx; BIOS stops execution here if entire memory is bad.
2E	1-3-4-3	RAM failure on data bits xxxx* of low byte on memory bus; BIOS stops execution
		here if entire memory is bad.

301-4-1-1 RAM failure on data bits xxxx* of high byte on memory bus; BIOS stops execution here if entire memory is bad.

32	Test CPU bus-clock frequency
34	Test CMOS
35	RAM initialize alternate chipset registers.
36	Warm start shutdown.
37	Reinitialize the chipset
38	Shadow system BIOS ROM
39	Reinitialize the cache
3A	Autosize cache
3C	Configure advanced chipset registers
3D	Load alternate registers with CMOS values
40	Set Initial CPU speed
42	Initialize interrupt vectors
44	Initialize BIOS interrupts
46	2-1-2-3 Check ROM copyright notice
47	Initialize manager for PCI Option ROMs
48	Check video configuration against CMOS
49	Initialize PCI bus and devices
4A	Initialize all video adapters in system
4B	Display QuietBoot screen
4C	Shadow video BIOS ROM
4E	Display copyright notice
50	Display CPU type and speed
51	Initialize EISA board.
52	Test keyboard

5-18 Solving Problems