Human Interfaces - HP 400 Series Servicing Manual

12. Checksum the Boot ROM.
13. Display CPU type.
14. Look for floating point co-processor.
15. Initialize HP-HIL (keyboard) electronics.
16. Drop Interrupt level.
17. Preload for main RAM test.
18. Test internal HP-IB interface.
19. Test DMA.
20. Test remaining RAM and set up bottom of memory.
21. Report any memory failures and the amount of memory found.
22. Initialize the bottom of memory.
23. Find and report any DIO-II I/O cards in the backplane.
24. Test LAN interface.
25. Test SCSI interface.
26. Initialize bit-mapped video/graphics boards.
27. Test interfaces that have I/O dependent test code.
28. Checksum any ROMs in ROM space and report any problems.
29. Output final LED value.
4.7.4

Human Interfaces

Several devices can act as the "console", or primary human interface, for the Boot
ROM. The list of possible console devices is explained in this section.
Output Devices
An RS-232 interface in the remote mode connected to a terminal can be used as an
output device. Bit-mapped video/graphics boards with their internal address set to
560000
dress set in the range 01000000 to 01C00000
4-34 Fault Isolation
may also be used. Bit-mapped video/graphics boards with their DIO-II ad-
16
are the most commonly used.
16