Major Registers, double
<UL>
<LI><b>M220A</b> is a drawing of DEC's M220A.</LI>
<LI><b>M220B</b> is a drawing of DEC's M220B.</LI>
<LI><b>M220C</b> is a drawing of DEC's M220C.</LI>
<LI><b>M220new</b> is an implementation that doesn't use the hard to find
7453 and 7482 chips.</LI>
<LI><b>M220pal</b> is a PAL implementation, using 22V10 programed with
m220pgm1.pds and m220pgm2.pds.</LI>
<LI><b>M220p16</b> is a PAL implementation, using 16V8 programed with
m220a.pds, m220b.pds, and m220c.pds.</LI>
<LI><b>M220at</b> is a PLD implementation, using ATF1508.</LI>
<LI><b>M220xc</b> is a PLD implementation, using XC9536XL programed with
m220a.v, m220b.v, and m220c.v.</LI>
<LI><b>M220X</b> is a 'modernized' M220 (using 16V8).</LI></UL>