HP 300

present
all on to
not power-up
70 Boot Rom Functions
Table 4-1. Power-Up Flow Chart
1
I
Oetermlne If on alpha video cord Is present. I
If one Is present, then Initialize, and blank It.
r
r::;;-;';:-~;-;:;'::-:;--;;~I-_:f~a~lIe~d~-JJ If on alpha video I
I Test top 16K bytes of RAM I -lcard Is present,
display, "RAM FAILED
ABOVE FFCOOO"
I Clear RAM monitor flog I
1
I Stop with LEOs-a4,.1
L------"--eoI cord Is present,
missing Jlf on alpha video I
1
display, "RAM GONE
ABOVE FFCOOO"
1
I Stop with LEOS-44,.1
I Re-entry from configure mOdel
1
I
set-u
p
modifiable data and code structures: I
• Self-test vectors • Boot scanner list vectors
• Human Interface vectors • Moss storage vectors
l Search ROM space for boot extension ROMs. Call any that pass checksum. I
I Go thru self-test vectors (see next flowchart) I
I Self test loop? I
yes
. I Jump to RESET I
I Boot scanner I
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