Tektronix MSO70000 Series Service Manual page 99

Table 4-20: BIOS POST codes: ECM-945GM Series (cont.)
Displayed
Module POST code
Reserved 3D
Test 8259-1 Mask Bits 3E
Reserved 3F
Test 8259-2 Mask Bits 40
Reserved 41
Reserved 42
Test Stuck 8259's 43
Interrupt Bits
Test 8259 Interrupt
Functionality
Reserved 44
Reserved 45
Reserved 46
Set EISA Mode 47
Reserved 48
Size Base and 49
Extended Memory
Reserved 4A
Reserved 4B
Reserved 4C
Reserved 4D
Test Base and 4E
Extended Memory
Reserved 4F
USB init 50
Reserved 51
Memory Test 52
Reserved 53
Reserved 54
CPU display 55
Reserved 56
MSO70000/C, DSA70000B/C, DPO70000B/C, DPO7000, MSO5000, DPO5000 Series
Description
Verify 8259 Channel 1 masked interrupts by alternately turning off and on the
interrupt lines.
Verify 8259 Channel 2 masked interrupts by alternately turning off and on the
interrupt lines.
Turn off interrupts then verify no interrupt mask register is on.
Force an interrupt and verify the interrupt occurred.
If EISA non-volatile memory checksum is good, execute EISA initialization.
If not, execute ISA tests and clear EISA mode flag.
Size base memory from 256K to 640K and extended memory above 1 MB.
Test base memory from 256K to 640K and extended memory above 1 MB using
various patterns.
NOTE.
This test is skipped in EISA mode and can be skipped with ESC key in
ISA mode.
Initialize USB controller
Test all memory of memory above 1 MB using Virtual 8086 mode, page mode, and
clear the memory
Detect CPU speed and display CPU vendor- specific version string and turn on all
necessary CPU features
Troubleshooting (MSO/DPO5000 Series)
4–55