Tektronix CSA7404B Service Manual

Troubleshooting
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
6-79
Table 6- 9: POST codes (Cont.)
Displayed
error code
Error message
Displayed
error code
Error message
2Ch To look for opti onal video ROM and give control. 9Ah Return af ter setting timer and printer base address.
2Dh To give control to processing after video ROM
returns control.
9Bh Returned after RS--232 base address.
2Eh If EGA/VGA not found then do display memory
R/W test.
9Ch Required initialization before Coprocessor is over.
2Fh EGA/VGA not found. 9Dh Coprocessor initialized.
30h Display memory R/W test passed. 9Eh Initialization after Coprocessor test is complete.
31h Display memory R/W test or retrace checking
failed.
A2h Going to display any soft errors.
32h Alternate Display memory R/W test passed. A3h Soft error display complete.
34h Video display checking over. A4h Keyboard t ypematic rate set.
37h Display mode set. Going to display the power--on
message.
A5h Going to enable parity/NMI.
38h Different buses initialization (input, IPL, general
devices) to start if present.
A7h NMI and parity enabled.
39h Display different buses initialization error mes-
sages.
A8h Initialization before E000 ROM control over.
3Ah New cursor posit ion read and saved. To display the
Hit <DEL> message.
A9h Returned from E000 ROM control.
40h To prepare the descriptor tables. AAh Initi alization after E000 optional ROM control is
over.
42h To enter virtual mode for memory test. ABh Put INT13 module runtime image to shadow.
43h To enable interrupts for diagnostics m ode. ACh Generate MP for multiprocessor support (if
present).
44h To initialize data to check memory wrap around at
0:0.
ADh Put CGA INT10 module (if present ) in Shadow.
45h Data initialized. AEh Uncompress SMBIOS module and initialization
SMBIOS code and form the runtime SMBIOS
image in shadow.
46h Memory wrap around test done. Memory size
calculation over.
B1h Going to copy any code to specific area.
47h Test pattern written in extended memory. D0h NMI is Disabled. On-board KBC, RTC enabled (if
present). Initialization code Checksum verif ication
starting.
48h Patterns writ ten in base memory. D1h Keyboard controller BAT test, CPU ID saved, and
going to 4 GB flat mode.
49h Amount of memory below 1M found and verified. D3h Do necessary chipset initialization, start memory
refresh, and do memory sizing.

Tektronix CSA7404B Specifications

General

Brand	Tektronix
Model	CSA7404B
Category	Measuring Instruments
Language	English