-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Hip8a5n2M05I7MBVcCyS+ZpoR5AKGdT3aYiyTqGQbyCuTLyk8R68rh+npHMpzT0e
 Gur9lU8mF3LRo29OEXG8SQ==

<SEC-DOCUMENT>0001005477-08-006052.txt : 20081015
<SEC-HEADER>0001005477-08-006052.hdr.sgml : 20081015
<ACCEPTANCE-DATETIME>20081015094717
ACCESSION NUMBER:		0001005477-08-006052
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20081010
FILED AS OF DATE:		20081015
DATE AS OF CHANGE:		20081015

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CATALYST SEMICONDUCTOR INC
		CENTRAL INDEX KEY:			0000899636
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				770083129
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0430

	BUSINESS ADDRESS:	
		STREET 1:		2975 STENDER WAY
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95054-3214
		BUSINESS PHONE:		4085421000

	MAIL ADDRESS:	
		STREET 1:		2975 STENDER WAY
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95054-3214

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Seligman Spectrum Focus (Master) Fund
		CENTRAL INDEX KEY:			0001404098
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21488
		FILM NUMBER:		081124094

	BUSINESS ADDRESS:	
		STREET 1:		PO BOX 309 UGLAND HOUSE
		STREET 2:		113 SOUTH CHURCH STREET
		CITY:			GEORGE TOWN, GRAND CAYMAN
		STATE:			E9
		ZIP:			BWI
		BUSINESS PHONE:		212-850-1864

	MAIL ADDRESS:	
		STREET 1:		100 PARK AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SELIGMAN J & W & CO INC /NY/
		CENTRAL INDEX KEY:			0000350440
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21488
		FILM NUMBER:		081124095

	BUSINESS ADDRESS:	
		STREET 1:		100 PARK AVENUE - 8TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10006
		BUSINESS PHONE:		212-850-1864

	MAIL ADDRESS:	
		STREET 1:		100 PARK AVENUE
		STREET 2:		100 PARK AVENUE 8TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MORRIS WILLIAM C
		CENTRAL INDEX KEY:			0001135080

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21488
		FILM NUMBER:		081124096

	MAIL ADDRESS:	
		STREET 1:		J&W SELIGMAN & CO INC
		STREET 2:		100 PARK AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar123.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-10-10</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000899636</issuerCik>
        <issuerName>CATALYST SEMICONDUCTOR INC</issuerName>
        <issuerTradingSymbol>CATS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000350440</rptOwnerCik>
            <rptOwnerName>SELIGMAN J &amp; W &amp; CO INC /NY/</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>100 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>8TH FL.</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001404098</rptOwnerCik>
            <rptOwnerName>Seligman Spectrum Focus (Master) Fund</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>PO BOX 309GT, UGLAND HOUSE</rptOwnerStreet1>
            <rptOwnerStreet2>SOUTH CHURCH STREET</rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN, GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001135080</rptOwnerCik>
            <rptOwnerName>MORRIS WILLIAM C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>100 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-10-10</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1884066</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.26</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Inv. Adviser on behalf of Fund-client.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <remarks>The disposition of Common Stock of the Issuer by the Reporting Persons was made pursuant to an acquisition of the Issuer.

This statement is filed pursuant to Section 16 of the Act and shall not be deemed an admission that J. &amp; W. Seligman &amp; Co. Incorporated or William C. Morris are, for purposes of Section 16 of the Act or otherwise, the beneficial owners of these securities.</remarks>

    <ownerSignature>
        <signatureName>Thomas G. Rose, CFO, on behalf of J. &amp; W. Seligman &amp; Co. Incorporated</signatureName>
        <signatureDate>2008-10-15</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Paul B. Goucher, authorized person, Seligman Spectrum Focus (Master) Fund</signatureName>
        <signatureDate>2008-10-15</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Judith G. Kuhlmann, power of attorney for William C. Morris</signatureName>
        <signatureDate>2008-10-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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