🚀 go-pugleaf

In article <735@ecrcvax.UUCP>, alan@ecrcvax.UUCP (Alan P. Sexton) writes:
> Can anyone give me an address or telephone number from which I can order
> a datasheet for the Yamaha YM-2149 sound chip that is used in the Atari?

The Yamaha YM-2149 is a slightly modified (I forget how) license of the
General Instrument AY-3-8910 PSG (Programmable Sound Generator.  GI published
a very good manual for this chip under the title "Programmable Sound Generator
Data Manual" in February, 1981 (I cannot find a part number) which covers the
architecture, operation, electrical interface, and music and sound effects
generation.  It has some pretty interesting information on using the D/A
circuitry.  The document covers both the AY-3-8910 and the AY-3-8912 PSG.
The '8912 is in a 28 pin package does not have the B I/O port, an "extra"
address line, or an additional test pin (which is not used in normal operation
anyway.)  Programming-wise, these chips are identical.  The Yamaha chip may
have a different pin-out.  I don't have my Atari documentation handy.

The manual has the following addresses: (quoted without permission)

	Microelectronics Division/General Instrument Corporation
			WORLDWIDE SALES OFFICES
	--------------------------------------------------------
	NORTH AMERICA
	Microelectronics Division

	Northeast --	600 West John Street
			Hicksville, New York 11802
			Tel: 516-733-3107, TWX: 510-221-1866

	Southeast --	7901 4th St. N., Suite 208
			St. Petersburg, Florida 33702
			Tel: 813-577-4024, TWX: 810-863-0398

			American City Bldg., Suite 602
			Columbia, Maryland 21044
			Tel: 301-730-8992, TWX: 710-862-2861

	South Central -	5520 LBJ Frwy., Suite 330
			Dallas, Texas 75240
			Tel: 214-934-1654

	East Central --	4524 S. Michigan Street
			South Bend, Indiana 46614
			Tel: 219-291-0585, TWX: 810-299-2518

	Central --	2355 S. Arlington Hts. Rd., Suite 408
			Arlington Heights, Illinois 60005
			Tel: 312-981-0040, TWX: 910-687-0254

	Southwest --	201 Standard Street
			El Segundo, California 90245
			Tel: 213-322-7745, TWX: 910-384-6296

	Western --	3080 Olcott St., Suite 235 D
			Santa Clara, California 95051
			Tel: 408-496-0844, TWX: 910-379-0010

	EUROPE

	    European Sales Headquarters:
		General Instrument Microelectronics Ltd.
		Regency House, 1-4 Warwick Street, London W1R 5WB
		Tel: 01-439-1891, Telex: 23272

	    Central European Sales Office:
		General Instrument Deutschland GmbH
		(MOS Produktgruppe)
		  ,
		Nordenstrasse 3, 8000 Munchen 40
		Tel: (089)28.40.31, Telex: 528054

	    Southern European Sales Office:
		Via Jacopo Palma, 20146 Milano
		Tel: (02)408.41.01, Telex: 332423

Note that the above information is from a document dated February, 1981, and
may have changed substantially over the past eight years.  I have left out
the Asian contacts because I'm very lazy.
-- 
 _____________________________________________________________________________
    Daniel A. Glasser                           One of those things that goes
    uwvax!per2!dag                              "BUMP!!!(ouch)" in the night. 
 ---Persoft, Inc.---------465 Science Drive-------Madison, WI 53711-----------