Multi-Tech Systems RAS96 manual Appendix C Post Codes, Code Name Description

RAS96 RASCard User Guide

Appendix C POST Codes

EISA power-on self-test (POST) codes are typically output to port address 300h. ISA POST codes are output to port address 80h.

Code	Name	Description
C0	Turn Off	Initialize standard devices with default values.
1	Processor Test 1	Processor Status (1FLAGS) Verification. Tests the following
		processor status flags carry, zero, sign, and overflow. The
		BIOS will set each of these flags, verify that they are set,
		then turn each flag off and verify that it is off.
2	Processor Test 2	Read/Write/Verify with data patterns FF and 00 all CPU
		registers except SS, SP, and BP.
3	Initialize Chips	Disable NMI, PIE, AIE, UEI, SQWV. Disable video, parity
		checking, and DMA. Reset math coprocessor. Clear all
		page registers, CMOS shutdown byte. Initialize timers 0, 1,
		and 2, and set EISA timer to a known state. Initialize DMA
		controllers 0 and 1. Initialize interrupt controllers 0 and 1.
		Initialize EISA extended registers.
4	Test Memory Refresh	RAM must be periodically refreshed to keep the memory
	Toggle	from decaying. This function assures that the memory
		refresh function is working properly.
5	Blank Video, Initialize	Keyboard controller initialization.
	Keyboard
6	Reserved
7	Test CMOS Interface	Verifies CMOS is working correctly, detects a bad battery.
	and Battery Status
BE	Chipset Default	Program chipset registers with power-on BIOS defaults.
	Initialization
C1	Memory Presence Test	OEM-specific. Test to size on-board memory.
C5	Early Shadow	OEM-specific. Early Shadow enable for fast boot.
C6	Cache Presence	External cache size detection test
8	Setup Low Memory	Early chipset initialization, memory presence test, OEM
		chipset routines, clear low 64K of memory, test first 64K of
		memory.
9	Early Cache	Cache initialization.
	Initialization
A	Setup Interrupt Vector	Initialize first 120 interrupt vectors with
	Table	SPURIOUS_INT_HDLR and initialize INT 00h-1Fh
		according to INT_TBL
B	Test CMOS RAM	Test CMOS RAM checksum; if bad, or if insert key pressed,
	Checksum	load defaults. Verify real time clock.
C	Initialize keyboard	Detect type of keyboard controller (optional). Set
		NUM_LOCK status.

DInitialize Video Interface Detect CPU clock. Read CMOS location 14h to detect type of video in use. Detect and initialize video adapter.

E	Test Video Memory	Test video memory, write sign-on message to screen. Set
		up shadow RAM. Enable shadow according to Setup.

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