IC BD M4Jr.2M - SukkoPera/SMSPlusPlus GitHub Wiki

IC BD M4Jr.2M is a revision of the Master System 2 board featuring the 315-5216 I/O Controller chip (IC4) (hidden under the Arduino Nano in this picture).

pics/ic_bd_m4jr_2m.png

• With this board you can use the same wiring instructions as IC BD M4Jr. PAL, but when it comes to soldering wires to the I/O chip at step 4/5, follow this table instead:

  IC4 Pin #	Pad Port Pin #	Signal	Wire Color	Inline resistor
  25	1	Up	Blue	No
  26	2	Down	Purple	No
  27	3	Left	Orange	No
  28	4	Right	Red	No
  29	6	TL (B1)	Yellow	No
  30	9	TR (B2)	Brown	Yes
  31	7	TH (Light)	Green	Yes

  pics/io_chip_5216.png

• Also, at step 8, the RESET OUT signal is on pin 22. It MIGHT not be necessary to unsolder the pin from the motherboard, since it is reported as NC on various diagrams, but I haven't checked that in person, so you are recommended to unsolder it anyway.

(All pictures contributed by ASSEMblerGames Forum member MoockyLoock - Thanks!)