Sony DPS-V77 service manual Pin No, Pin name, Description

Pin No.	Pin name		I/O	Description
66	EXTAL	0		System clock. (lOMHz)
67	XTAL		I	System clock. (lOMHz)
68	Vee	-		Power supply.
69	AS	0		Not used.
70	RD	0		Lead signal output to digital meter (lC605), gate alley (lC606), master program ROM (lC607)
				and master RAM (lC608, 609)
71	HWR	0		Upper rank byte light output to the digital meter (IC605), gate array (IC606), master RAM
				(lC608,609).
72	LWR	0		Not used.
73	MDO		I	Operation mode select input. (Fixed "H" level)
74	MDI		I	Operation mode select input. (Fixed "H" level)
75	MD2		I	Operation mode select input. (Fixed "L" level)
76	AVee	-		AID converter power supply. (+5V)
77	VREF		I	Reference voltage input to AID converter.
78	ANO		I	Battery input terminal.
79	ANI		I	Error condition input from digital input IC (IC90l).
80	AN2		I	FREQ REPORT 0 input from digital input IC (IC90l).
81	AN3		I	FREQ REPORT 1 input from digital input IC (lC90l).
82	AN4		I	FREQ REPORT 2 input from digital input IC (lC90l).
83	AN5		I	ERROR FLAG input from digital input IC (lC90l).
84	AN6		I	Padal switch 2 input terminal.
85	AN7		I	Padal switch 1 input terminal.
86	AVss	-		GND (AID converter)
87	IRQO		I	Interrupt request signal input from LCD controller (lC6l0).
88	P8I	0		Conditional jump output to DSP (lC602).
89	P82	0		Conditional jump output to DSP (lC604).
90	CSI	0		Address data output to gate alley (lC606).
91	CSO	0		Chip enable output to EEPROM (lC607).
92	Vss	-		GND
93	PAO	0		LCD data output.
94	PAl	0		LCD data output.
95	PA2	0		LCD data output.
96	PA3	0		Clock change signal output.
97	PA4	0		LCD data output.
98	PAS	0		Latch output to 0/A converter.
99	PA6	0		MIDI THRU/OUT change signal output.
100	A20	0		Not used.

- 23-