Original Commentary
This is, of course, how Brisbane makes most of his major purchases - he has someone else decide for him.

Modern Commentary
I'm not sure Brisbane's third-panel question makes any sense. Every computer I've seen has used the same kind of power cable, and attaching numbers to that is just trying to dazzle and confuse folks like Brisbane.
The stage directions - and I don't usually include stage directions - for Robert in panel 2 are that the implied meaning is "And your question is?".
He is not looking at where he's pointing. The options are all good enough and Brisbane doesn't know what questions to ask or how to understand the answers he'd get- Terrence