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Power On Self Tests (POSTs)
When you turn on system power, the BIOS performs a series of tests and initializations. Each test or
initialization step is identified by a numeric "POST" code written to I/O address 378H. These codes
can be displayed using a commercially available "POST code display board". The following table
lists the POST codes expressed in hexadecimal, with their corresponding meanings.
POST code list
Code
Meaning
00H
CPU validation
01H
CPU test
02H
Component default programming
03H
Timer initialization
04H
Refresh line test
05H
BIOS EPROM test
06H
Keyboard controller test
07H
First 64K RAM test
08H
EEPROM test
09H
0F0000H-0FFFFFH shadow memory test
0AH
DMA and interrupt controller initializations
0BH
Video device test
0CH
Timer #2 test
0DH
DMA controller #1 test
0EH
DMA controller #2 test
0FH
DMA page control registers test
10H
Interrupt controller #1 test
11H
Interrupt controller #2 test
12H
Shutdown byte test
13H
Interrupt line 0 test
14H
Keyboard test
15H
Protected-mode switch test
16H
Base memory size
17H
Expanded memory size
18H
Base memory test
19H
Expanded memory test
1AH
Co-processor test
1BH
Real Time Clock test
1CH
IRQ line test
1DH
Parallel port test
1EH
Floppy disk test
1FH
Hard disk test
20H
Serial port test
21H
Mouse test
22H
Shadow RAM test
Содержание CMV6486DX100HR
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Страница 28: ...28 I O Connections...
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Страница 48: ...48 Configuring Hardware...
Страница 74: ...74 An example BASIC program illustrating EEPROM access is in the file CMV_EE BAS on the cpu Module utility disk...
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Страница 118: ...118 RTD Embedded Technologies Inc 103 Innovation Blvd State College PA 16803 0906 USA Our website www rtd com...