Nice, the old BWD's are ace Cro's, gee i used them at school ALL those years ago....
That model should easily handle pin-cpu signals, no probs.

I'd start with setting the trigger (between the probes) to Channel 1 (assuming you use channel1 probe for your measurments).

Set the volts/Div so the signal almost fills the screen height makes it easier to read.

Select the 'trigger' button at top-right to also be AC/DC (same as your probe setting AC/DC, and anything that relates to channel 1 etc.

Probably also play with the 'level' control, down under the green dot sticker...it should help trigger the display at various level of your signals.

that's a start 


AJ:
I reckon you should organise thru the moderators to offer a special AP Cro-deal for our newbies.
You might crack a decent order for 10 Cro's at a better discount price to help them on their way...

Hmmm, a Cro & MMeter might make good prizes in any upcoming meets & raffles hey?

just my 2c
MM.