note to self:
h32 0x10A .. 0x127 0x1D2 .. 0x1FF 0x000 .. 0x109
pclk 30 | 46 | 266 = 342
hbset 0x126 ... 0x009
pclk 29 | 1 + 46 + 10 | 256
mclk 290 | 570 | 2560 = 3420
68kclk 41.4 81.4 365.7 ~= 488.5
h40 0x14A .. 0x16C 0x1C9 .. 0x1FF 0x000 .. 0x149
pclk 35 | 55 | 330 = 420
hbset 0x166 ... 0x00A
pclk 28 | 7 + 55 + 11 | 319
mclk 28*8 | 7*8 4*8+314+10+(18+11)*8 | 319*8 = 3420
68kclk 32 92 364.5 ~= 488.5