SC-02 / SSI 263A speech synthesizer pinout

DIP-24. Speech on the HERO 2000 (SSI-263 at I/O $50-$57).

A phoneme synthesizer with five write registers picked by RS0-RS2; the HERO 2000 I/O map calls it SSI-263 and the I/O PAL calls its select SC02. Pin data is from the Silicon Systems SSI 263A sheet, which the same data book lists as Votrax SC-02 compatible. A/R goes low to ask for the next phoneme. Audio leaves on AO biased at half supply and needs an external amplifier.

Open the interactive SC-02 pinout

Pins

Pin	Name	Type	Signal
1	AO	audio	Analog audio output, biased at VDD/2; needs an external amplifier.
2	AGND	ground	Analog ground.
3	TP1	nc	Test pin; do not use.
4	A/R	ctrl	Acknowledge/request, open collector; goes low to request new data (the bar is over R only).
5	TP2	nc	Test pin; do not use.
6	RS2	addr	Register select bit 2 (one of five registers).
7	RS1	addr	Register select bit 1.
8	RS0	addr	Register select bit 0.
9	D0	data	Data bit 0 (LSB), input only.
10	D1	data	Data bit 1, input only.
11	D2	data	Data bit 2, input only.
12	DGND	ground	Digital ground.
13	D3	data	Data bit 3, input only.
14	D4	data	Data bit 4, input only.
15	D5	data	Data bit 5, input only.
16	D6	data	Data bit 6, input only.
17	D7	data	Data bit 7 (MSB); on a read it outputs the inverse of A/R.
18	/PD /RST	ctrl	Power-down/reset, active low: silences audio, keeps the registers, disables A/R.
19	CS0	ctrl	Chip select, active high.
20	/CS1	ctrl	Chip select, active low.
21	R/W	ctrl	Low writes the registers; high reads D7 only.
22	XCK	clock	Clock input (about 1 or 2 MHz).
23	DIV2	ctrl	High divides XCK by two (for a 2 MHz clock).
24	VDD	power	+5 V supply (drawn Vs on the pinout).

Fitted in

HERO 2000 designator not read

Sources

Silicon Systems SSI 263A, 1985 Silicon Systems Data Book, printed p. 1-42