2-51
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01
2.12 Diagnostic Messages (Port 80)
In order of occurence
Any errors are also output as sound sequences until the test for the video
controller (codes 01 to 4A) occurs. The tone generation mode is structured as
follows:
Division of the byte into 2-bit combinations
Output of this combination as a sound
sequence, that is
0
→
one tone
1
→
two tones
2
→
three tones
2
→
four tones
There is a brief pause between tones
Example:
Error during the RAM basic test
0
0
1
0
1
1
1
0
2
E
0
2
3
2
Sound sequence
Display (hex)
Meaning
Description
02
TP_VERFY_REAL
Test whether CPU is in real mode
04
TP_GET_CPU_TYPE
Determine the CPU type
06
TP_HW_INIT
Initialize the main hardware (DMA, IRQ)
18
TP_TIMER_INIT
Initialize the timer
08
TP_CS_INIT
Initialize the chip set
0C
TP_CACHE_INIT
Initialize the cache
16
TP_CHECKSUM
EPROM checksum test
28
TP_SIZE_RAM
Determine RAM size
3A
TP_CACHE_AUTO
Determine cache size
2A
TP_ZERO_BASE
Set 512k base RAM to 0
2C
TP_ADDR_TEST
Test the base RAM address cables
2E
TP_BASERAML
Check the 1.64k base RAM
38
TP_SYS_SHADOW
BIOS shadow
20
TP_REFRESH
Refresh circuit test
09
TP_SET_IN_POST
Start Power On self-test
0A
TP_CPU_INIT
Initialize CPU
0B
TP_CPU_CACHE_ON
Turn on cache
0F
TP_FDISK_INIT
Initialize hard disk
14
TP_8742_INIT
Initialize 8742 circuit
1A
TP_DMA_INIT
Initialize DMA circuit
1C
TP_RESET_PIC
Reset interrupt controller
22
TP_8742_TEST
Test circuit 8742
32
TP_COMPUTE_SPEED
Determine clock pulse speed
34
TP_CMOS_TEST
Test CMOS RAM
Motherboard