This page serves as a mental note, when converting Markdown-pages to MediaWiki format, for use in the Electriki IRC-wiki.
Install Pandoc, and convert your page:
pandoc -f markdown_strict My_Page.markdown -t mediawiki -o My_Page.mediawiki
Then, create a new MediaWiki-page, paste this generated ".mediawiki" file into the form, and sumbit the form.
Add a heading at the top of the page:
__NOEDITSECTION__ [[category:projects done]] <blockquote> ''NOTE: this page is copied here because this is (sort of) electronics-related - '' ''the original page is [http://home.mircad.nl/md/MyPage.html here]. '' ''Some formatting-details (e.g. underscores) may be malformed in this copy.'' </blockquote>
(Another common project-category is "!electronics" for non-electronics related stuff.)
On the left of the page, choose "Upload file" ("Upload multiple files" doesn't seem to work at the time of writing).
(MediaWiki's upload-form seems to warn about changed filename (e.g. that it will convert multiple underscores into a single one), but uploaded files can magically still be refered to from the corresponding page, even if it used references containing multiple underscores in filenames.
In other words, I think it's safe to ignore these "filename changed" warnings during upload.
I didn't really look into this, but Markdown code-blocks (using "<pre>...</pre>" directives with escaped special characters like """ instead of quotes, when rendered to HTML) are converted by Pandoc into exactly that - literal "<pre>...</pre>" blocks with escaped special chars.
That means that the appearance of code-blocks in generated MediaWiki pages is fixed at the time of conversion, and e.g. MediaWiki's "<syntaxhighlight lang=...>...</syntaxhighlight>" tags can not be used easily. Oh well.