Some of the two-row headers are numbered by row, some by column. Surprise! I don't know how many people have this board or need this information, but I figured since I went to the trouble of typing it up for myself, I might as well share it:
J2 Famicom EXP
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.--\/--.
Gnd -- |01 09| -> ($4017 read strobe) /OE for joypad 2 (exp pin 11)
Audio in -> |02 10| -> out 2 ($4016 write data, bit 2)
IRQ -> |03 11| -> out 1 ($4016 write data, bit 1)
joypad 2 D4 xx |04 12| -> out 0 ($4016 write data, bit 0, strobe on sticks)
joypad 2 D3 xx |05 13| <- joypad 1 D1
joypad 2 D2 -> |06 14| -> /OE for joypad 1 ($4016 read strobe) (exp pin 34)
joypad 2 D1 -> |07 15| -- +5V (expansion port pin 1)
joypad 2 D0 xx |08 16|
'------'
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.--\/--.
+5V (exp pin 1) -- |01 02| -- Gnd
A15 <- |03 04| -> out 2 ($4016 write data, bit 2)
out 1 ($4016 write data, bit 1) <- |05 06| -> out 0 ($4016 write data, bit 0, strobe on sticks)
EXP9 ?? |07 08| ?? EXP8
EXP7 ?? |09 10| ?? EXP5
($4017 read strobe) /OE for joypad 2 (exp pin 17) -- |11 12| xx joypad 2 D0
joypad 2 D1 -> -- |13 14| <- joypad 2 D2
joypad 2 D3 xx |15 16| xx joypad 2 D4
CPI D0 <> |17 18| <> CPU D1
CPI D2 <> |19 20| <> CPU D3
CPI D4 <> |21 22| <> CPU D5
CPI D6 <> |23 24| <> CPU D7
unregulated power adapter vdd -- |25 26| <> /IRQ
'------'
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.--\/--.
+5V (exp pin 48) -- |01 02| -- Gnd
EXP0 ?? |03 04| -> /NMI
EXP2 ?? |05 06| ?? EXP1
EXP4 ?? |07 08| ?? EXP3
joypad 1 D4 xx |09 10| -> /OE for joypad 1 ($4016 read strobe) (exp pin 37)
joypad 1 D2 -> |11 12| xx joypad 1 D3
joypad 1 D0 xx |13 14| <- joypad 1 D1
4.00MHz CIC CLK <- |15 16| xx IRQ
'------'