Prototype “Sticks” Input controller

An AVR 5v tolerant 8-bit RISC microcontroller clocked at up to 24Mhz, used to interface to the 4 Atari/Sega joystick interfaces at the front of the computer. Programmable via a single wire UPDI interface.

Flash: 128K, SRAM: 16KB, EEPROM: 512 bytes, User row: 32 bytes.

The prototype uses a 16Mhz AVR128DB48 Curiosity Nano dev kit (on a Nano Base), the final will use a 24Mhz AVR128DB64 microcontroller.

Four Atari/Sega DP9 stick ports, (6 button sticks, analog paddles, 9 pin mice).

Port A can be configured to be an I2C port (pins 3 and 4)

Each port can be configured for serial port TX/RX (pins 6 and 7)

Curiosity nano pinout usage

Description	Function	Pin	Pin	Function	Description
NC	NC	1	29	VBUS
	ID	2	30	VOFF	GND
NC	B0	3	31	F6	RESET
NC	B1	4	32	UPDI	DEBUG
Yellow LED	B2	5	33	GND	GND
Button	B3	6	34	VTG	5V
DB9-D3	F4	7	35	D6	DB9-D5
DB9-D4	F5	8	36	D3	DB9-B9
DB9-A1	A2	9	37	D2	DB9-B5
DB9-A2	A3	10	38	D1	DB9-A9
DB9-A3	A4	11	39	D0	DB9-A5
DB9-A4	A5	12	40	D7	DB9-D9
DB9-A6	A6	13	41	D5	DB9-C9
DB9-A7	A7	14	42	D4	DB9-C5
GND	GND	15	43	GND	GND
DB9-B6	B0	16	44	E3	SPI0-SEL
DB9-B7	B1	17	45	E2	SPI0-SCK
DB9-D1	F2	18	46	E1	SPI0-MISO
DB9-D2	F3	19	47	E0	SPI0-MOSI
DB9-C6	C0	20	48	C7	DB9-C5 via 2N2222
DB9-C7	C1	21	49	C6	SPI0 INT-OUT
DB9-C1	C2	22	50	C5	DB9-C4
DB9-C2	C3	23	51	C4	DB9-C3
GND	GND	24	52	GND	GND
16 Mhz IN	A0	25	53	B5	DB9-B5
16 Mhz OUT	A1	26	54	B4	DB9-B4
DB9-B1	B2	27	55	F1 CUT J208	DB9-D7
DB9-B2	B3	28	56	F0 CUT J207	DB9-D6