IC number:	6525 / 6523
IC function:	TPI (Tri-Port Interface)

Component documentation

IC number	Manufacturer	Documentation
6525, 6523, 65C23	MOS Technology / CSG	Not available

Component versions

IC number	Package	Speed	CBM part number	CBM part description
MCS6525	40-pin Ceramic DIP	1 MHz
MPS6525	40-pin Plastic DIP	1 MHz
MCS6525A	40-pin Ceramic DIP	2 MHz	901343-01	LSI, 6525A
MPS6525A	40-pin Plastic DIP	2 MHz
MCS6525B	40-pin Ceramic DIP	3 MHz	901979-03	TRI-PORT 6525B
MPS6525B	40-pin Plastic DIP	3 MHz
MCS6523	40-pin Ceramic DIP	1 MHz
MPS6523	40-pin Plastic DIP	1 MHz
MCS6523A	40-pin Ceramic DIP	2 MHz	901401-02	LSI, 6523A TRI-PORT
MPS6523A	40-pin Plastic DIP	2 MHz
MCS6523B	40-pin Ceramic DIP	3 MHz
MPS6523B	40-pin Plastic DIP	3 MHz
MCS65C23	40-pin Ceramic DIP	1 MHz
MPS65C23	40-pin Plastic DIP	1 MHz
6523A-28	28-pin DIP		901903-01	LSI, 6523A-28

Positions

Device	Positions	Component	Package
CDTV	U32	6525	DIP
A570	U21	6525	DIP
CBM II lo-profile	U2	6525	DIP
	U28	6525 or 6523
CBM II hi-profile	U4	6525	DIP
	U84	6525 or 6523
1551 main board	U3	6525 or 6523	DIP
1551 paddle board	U2	6523-28	DIP

Pinout 6525 / 6523

Pin	Type	Name	Signal name
			CDTV	A570
1	Power	VSS	GND
2	I/O	PA0	P
3	I/O	PA1	Q
4	I/O	PA2	R
5	I/O	PA3	S
6	I/O	PA4	T
7	I/O	PA5	U
8	I/O	PA6	V
9	I/O	PA7	W
10	I/O	PB0	_CMD
11	I/O	PB1	_ENABLE
12	I/O	PB2	_XAEN
13	I/O	PB3	_DTEN
14	I/O	PB4	WEPROM	unused
15	I/O	PB5	DACATT
16	I/O	PB6	DACST
17	I/O	PB7	DACLCH
18	Input	CS_	_CSX0 and A4 via U22 and U26	Connected to pin 63 of U7
19	Input	WRITE_	R_W	R/W
20	Power	VDD	VCC
21	Input	RST_	_IFRST
22..24	Input	RS2..RS0	A3..A1
25	I/O	PC0	Connected to pin 1 of U21	Connected to pin 3 of U7
26	I/O	PC1	SCOR via U40	SCOR via U8
27	I/O	PC2	_STCH via U26	_STCH via U8
28	I/O	PC3	_STEN
29	I/O	PC4	DRQ
30	I/O	PC5	_INT2
31	I/O	PC6	MS0	unused
32	I/O	PC7	MS1	unused
33..40	I/O	DB0..DB7	SD8..SD15	SD0..SD7