Troubleshooting
6-78
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
Table 6- 9: POST codes (Cont.)
Displayed
error code
Error message
Displayed
error code
Error message
07h CPU initialization and CPU data area initialization
to be done.
80h Keyboard t est started. Clearing output buffer,
checking for stuck key, to issue keyboard reset
command.
08h CMOS checksum calculation to be done next. 81h Keyboard reset error/st uck key found.
0Bh Any initialization before keyboard BAT to be done
next.
82h Keyboard cont roller interface test over.
0Ch KB controller I/B free. To issue the BAT comm and
to keyboard c ontroller.
83h Command byte written, global data initialization
done.
0Eh Any initialization after KB controller BAT to be done
next.
84h Lock--key checking over.
0Fh Keyboard command byte to be written. 85h Memory size check done.
10h Going to issue Pin--23,24 blocking/unblocking
command.
86h Password checked.
11h Going to check pressing of <INS>, <END> key
during power--on.
87h Programming before setup complete.
12h To initialization CMOS if ”Init CMOS in every boot”
is set or <END> key is pressed. Going to disable
DMA and Interrupt controllers.
88h Returned from CMOS setup program and screen is
cleared.
13h Video di splay is disabled and port--B is initialized.
Chipset initialization about to begin.
89h Programming after setup complete.
14h 8254 timer test about to start. 8Bh First screen message displ ayed. <WAIT .>
message displayed.
19h About to start memory refresh test. 8Ch Setup options programming after CMOS setup
about to start.
1Ah Memory Refresh line is toggling. Going to check
15 sON/OFFtime.
8Dh Going for hard disk controller reset.
23h To read 8042 input port and disable Megakey
GreenPC f eature. Make BIOS code segment
writable.
8Fh Hard disk controller reset done.
24h To do any setup before Int vector initialization. 91h Floppy setup complete.
25h Interrupt vector initialization to begin. To clear
password i f necessary.
95h Init of different buses optional ROMs from C800 to
start.
27h Any initialization before setting video mode to be
done.
96h Going to do any initialization before C800 optional
ROM control.
28h Going for monochrome mode and color mode
setting.
97h Any initialization before C800 optional ROM control
is over.
2Ah Different buses initialization (system, static, output
devices) to start if present.
98h Optional ROM control i s done.
2Bh To give control for any setup required before
optional video ROM check.
99h Initialization required after optional ROM test over.
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