Replacements for obsolete chips
<UL>
<LI><b>2364</b> is Nicolas Welte's board to replace 27256 with 29F010.</LI>
<LI><b>2364-std</b> is 2364 with the jumpers renumbered.</LI>
<LI><b>6502exp</b> is Nicolas Welte's board to replace the 6502 core,
providing additional RAM and flash.</LI>
<LI><b>6540</b>is Nicolas Welte's board to replace the 6540 with a
27xxx EPROM.</LI>
<LI><b>6550</b> is Nicolas Welte's board to replace a pair of 6550
with a 62256.</LI>