Family Noraebang Karaoke pinout
Family Noraebang Karaoke: 45 pin card expansion (iNES 2.0 Mapper 515)
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CPU R/W <- |23 01| -- GND
+5V -- |24 02| -- GND
CPU A7 <- |25 03| -- GND
CPU A12 <- |26 04| NC
CPU A5 <- |27 05| -- +5V
CPU A6 <- |28 06| -> PRG A18
CPU A3 <- |29 07| -- GND
CPU A4 <- |30 08| -> PRG A17
CPU A1 <- |31 09| -> PRG A20
CPU A2 <- |32 10| -> PRG A16
CPU D0 -> |33 11| -> PRG A19
CPU A0 <- |34 12| -> PRG A15
CPU D2 -> |35 13| -- VCC
CPU D1 -> |36 14| -> CPU A13
GND -- |37 15| -> PRG A14
GND -- |38 16| -> CPU A9
CPU D3 -> |39 17| -> CPU A8
GND -- |40 18| <- /IRQ
CPU D5 -> |41 19| -> CPU A10
CPU D4 -> |42 20| -> PRG A21
CPU D7 -> |43 21| -> M2
CPU D6 -> |44 22| -> CPU /ROMSEL
CPU A11 <- |45 |
'------'
^ ^----- bottom side (this row is shifted by half of pin width)
+--------- label side
Source: [1]