Hello again! Haven't updated my site in a while since other Real Life (tm) activities ate my free time...
But finally found some time to finish a final round of testing, update docs, make some pix, slap together a webpage & upload it:
http://bitcycle.org/retro/msx/512k_mapper/
A 512 KB external memory mapper built with just 2 IC's... Logic sits inside a small programmable logic IC, and for those who like to tweak things, source code of the logic inside that part comes with it. Very extensively tested. Have fun!
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.. for me it looks a little small for my 'soldering' skills
Adapter boards are impossible to find or ridiculously expensive.