Apple II

I found the Apple //c diagnostic disk image a while back.  I tried running it on my //c, but never got much out of it.  Apparently it is meant to be used in conjunction with some service manual and a loopback cable.  But I've never identified which manual it is.  If anyone knows for which manual and where to find a copy, I'd be interested.  But I did manage to acquire an offical Apple loopback cable for the //c, part number 077-8148.  Now I can actually go through the diagnostic disk successfully.  As I can't find any documentation on this, i figure i would document it here if anyone is int

I have tried to understand what model of Apple ][ this is. I asked in some groups on FB and i got a lot of people saying it's definitley a ][+ and equally many saying its definitley a ][.

How to tell?

I put an album up on https://imgur.com/a/etoKXrn

So I was fixing my last broken Apple /// System and after the Ram board was ironed out I realized the Keyboard was acting flakey. Turns out the Keyboard Controller 341-0035 at location H-14 was faulty. I swapped in a working chip from another Apple /// and it tested fine so I know the IC is dead. Here is the thing though, the Chip in the socket that is faulty (70% of the keys pressed come out wrong) is a KR3600-085 and is not labeled 341-0035 like my working chip. Isnt the KR3600 the same controller in the Apple II plus?

I acquired a floppy called "Apple 5.25 Drive Test Reference Disk" (part number 077-0325) and it says the disk is not copyable.  So I assumed it was a specially created/formatted disk like the Datalife Analyzer disk/program for checking alignments.  But it turns out I was only half right.  It is a specially formatted floppy to test alignment.  But it has no software on it and requires a separate program disk named "Apple 5.25 Drive Test 1.0" (part number 077-0324).  A quick Google search and a scan of Asimov don't seem to yield any images for the program disk.  Does anyone by chance know if