USB-NES Pinout

Here is the STM32F103 “Blue Pill” and its relation to the 72-pin connector on USB-NES.

^{Layout of a typical “STM32 Barebones” system board.}

USB-NES Blue-Pill Map

Blue Pill Pin	Description	Function	CPU bus cart pin	PPU bus cart pin	Cart power pin
1	VBAT
2	PC13	/CART_POWER1
3	PC14	PAD_CLOCK2
4	PC15	PAD_STROBE2
5	PA0	A8	5	60
6	PA1	A9	4	61
7	PA2	A10	3	63
8	PA3	A11	2	62
9	PA4	A12	39	64
10	PA5	A13	40	65
11	PA6	A14 (PPU /A13)	41	58
12	PA7	/ROMSEL	50
13	PB0	A0	13	29
14	PB1	A1	12	28
15	PB10	D2	47	32
16	PB11	D3	46	33
17	NRST
18	3V3
19	GND				1, 72
20	GND				1, 72
21	PB12	D4	45	69
22	PB13	D5	44	68
23	PB14	D6	43	67
24	PB15	D7	42	66
25	PA8	M2	38
26	PA9	CPUR/W	14
27	PA10	/IRQ	15
28	PA11	USB-
29	PA12	USB+
30	PA15	PPU/WR		56
31	PB3	A3	10	26
32	PB4	A4	9	25
33	PB5	A5	8	24
34	PB6	A6	7	23
35	PB7	A7	6	59
36	PB8	D0	49	30
37	PB9	D1	48	31
38	5V				361
39	GND				1, 72
40	3V3
41	3V3
42	PA13	CIRAM.A10		22
43	PA14	PPU/RD		21
44	GND				1, 72
45	3V3
46	PB2	A2	11	27
47	GND				1, 72
48	3V3
49	BOOT0
50	GND				1, 72

USB-NES Replacement Part Sources

• IC BUFFER NON-INVERT 5.5V SOT25
• MOSFET P-CHANNEL 20V 4.7A SOT23
• RES SMD 10K OHM 5% 1/4W 1206
• 72-Pin inline NES connector
• CAP ALUM 560UF 20% 10V RADIAL