I would like to test a Grappler Plus card for which I don't have a ready cable (to printer).  Is that possible?  When I try to enable the slot it's in the machine doesn't produce a response on the screen I can use to debug.

I also want to test the Z80 coprocessor card.  I found three "ALS CPM Card" disk images (in .po) format that I'm hoping - as they say - are ProDOS, boot, and CP/M disks respectively, and it should then be self-evident.  But if anyone knows of the manual that'd be fantastic.

And to bump the previous, but less interesting paragraph, any sort of online list detailing how to test a grappler would be appreciated.