SBC/README: Add description of jumper settings

[0cjs]

Per issue #9.

[0cjs]

@tebl Are there any issues with this preventing it from being merged?

[tebl]

It's just been an issue of time, I'm in the process of moving and currently I'm not even sure where my laptop is. Hoping to find some more time this summer to do a proper review of the documentation. tir. 19. mai 2020, 12:55 skrev Curt J. Sampson <notifications@github.com>:

…

@tebl <https://github.com/tebl> Are there any issues with this preventing it from being merged? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#10 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGEF6IJQVM6G4CWP2P2KU6DRSJQTJANCNFSM4MSNXG7Q> .

[0cjs]

Ok, no problem. If in the meantime you want to review this by just using the web interface to view the diff and the rendered version and asking me for changes (even trivial ones), I'm happy to do that. However, I've been working with the PDF export of the schematic because at the moment I'm unable to load the .sch file into KiCAD. (I'll have to work out at some point where my issue is with this.)

[tebl]

RAM_EN / ROM_EN are low when accessed by the system, jumper connects them with the glue logic. Otherwise, a good set of additions to the documentation.

[0cjs]

Oh, good catch! I seem to have that error on the brain; I "fixed" that with bodge wires when building my SBC, too, which of course didn't work until I unfixed it.

I've pushed up a FIXUP commit so you can easily see the diff; I will squash (fixup in git rebase -i, actually) the two commits together after you've reviewed it. (Unfortunately GitHub doesn't let me change this PR to "not ready to merge" state, so be careful not to merge until I've squashed. :-))