Technical data

Boot ROM State Codes
Table 4-3. LED State Codes In Numerical Order
LEDs Test Activity
0000 0000 No failure
0000 000. LED ripple (all on, then off in sequence from MSB)
0000 00.0 Resetting I/O
0000 00.. Checksumming Boot ROM (or LED ripple)
0000 0.00 Testing top RAM (or maybe the Boot ROM checksum failed)
0000 0 •• 0 Searching for boot extension ROMs
0000 0... Starting test vector list (or LED ripple)
0000 .000 Preloading RAM
0000 .00. Testing RAM
0000 •••• LED ripple
000. 00.0 Testing keyboard circuit (or an interrupt line is stuck)
000. 0 •• 0 Testing processor HP-IB
000 •• 000 Testing DMA
000 • •• 0. Checksumming ID /INIT ROM
oo.x xxxx Testing I/O at select code x xxxx
Troubleshooting 33
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