[TUHS] kernel debugging in analogue

Steve Simon steve at quintile.net
Sat Jul 2 09:38:11 AEST 2022

i remember a fellow student debugging an lsi11 kernel using a form of analogue vectorscope.

i think it had a pair of DACs attached to the upper bits of the address bus. it generated a 2d pattern which you could recognise as particular code - interrupts are here, userspace is there, etc.

the brightness of the spot indicated the time spent, so you got a bit of profiling too - and deadlocks became obvious.

anyone remember these, what where they called? i think it was an HP or Tek product.


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