6510 CPU pinout

DIP-40. CPU

C64 CPU at ~1 MHz with a 6-bit I/O port (P0-P5) for bank switching and the Datasette. Same core as the 6502; the port is the difference.

Open the interactive 6510 pinout

Pins

Pin	Name	Type	Signal
1	Φ1 IN	clock	Clock input (data sheet name Φ1 IN). On the C64 it is fed from the VIC-II Φ0 output (VIC pin 17).
2	RDY	ctrl	Ready. The VIC-II pulls this LOW through BA to stall the CPU on badlines.
3	/IRQ	ctrl	Interrupt request from CIA1 and the VIC-II.
4	/NMI	ctrl	Non-maskable interrupt, from CIA2 (sheet).
5	AEC	ctrl	Address Enable Control. VIC-II takes it LOW to tri-state the CPU address bus during its own fetches.
6	Vcc	power	+5 V logic supply.
7	A0	addr	Address bus bit 0.
8	A1	addr	Address bus bit 1.
9	A2	addr	Address bus bit 2.
10	A3	addr	Address bus bit 3.
11	A4	addr	Address bus bit 4.
12	A5	addr	Address bus bit 5.
13	A6	addr	Address bus bit 6.
14	A7	addr	Address bus bit 7.
15	A8	addr	Address bus bit 8.
16	A9	addr	Address bus bit 9.
17	A10	addr	Address bus bit 10.
18	A11	addr	Address bus bit 11.
19	A12	addr	Address bus bit 12.
20	A13	addr	Address bus bit 13.
21	GND	ground	0 V.
22	A14	addr	Address bus bit 14.
23	A15	addr	Address bus bit 15.
24	P5	io	Port bit 5: Datasette motor control output (LOW = motor on).
25	P4	io	Port bit 4: Datasette sense input (play key down).
26	P3	io	Port bit 3: Datasette write output (cassette port pins E/5).
27	P2	io	Processor port bit 2: /CHAREN, character ROM or I/O at $D000.
28	P1	io	Processor port bit 1: /HIRAM, KERNAL ROM at $E000.
29	P0	io	Processor port bit 0: /LORAM, BASIC ROM at $A000.
30	D7	data	Data bus bit 7.
31	D6	data	Data bus bit 6.
32	D5	data	Data bus bit 5.
33	D4	data	Data bus bit 4.
34	D3	data	Data bus bit 3.
35	D2	data	Data bus bit 2.
36	D1	data	Data bus bit 1.
37	D0	data	Data bus bit 0.
38	R/W	ctrl	Read/write from the CPU. HIGH = read, LOW = write.
39	Φ2 OUT	clock	Phase 2 system clock out. Feeds the CIA (pin 25) and SID (pin 6) Φ2 inputs. UNVERIFIED
40	/RES	ctrl	Reset. LOW at power-up, released HIGH so the CPU reads its reset vector.

Fitted in

Commodore 64 U7

6510 CPU pinout

Pins

Fitted in

Sources