Corporate Presentation January 2005 Safe Harbor Statement

This presentation may contain forward-looking statements about the Company including, without limitation, benefits and performance expected from use of the Company’s 1T-SRAM technologies.Forward-looking statements are based on certain assumptions and expectations of future events that are subject to risks and uncertainties. Actual results and trends may differ materially from historical results or those projected in any such forward-looking statements depending on a variety of factors. These factors include but are not limited to, customer acceptance of our 1T-SRAM technologies, the timing and nature of customer requests for our services under existing license agreements, the level of commercial success of licensees’ products such as the Nintendo GAMECUBE and cell phone hand sets, ease of manufacturing and yields of devices incorporating our 1T-SRAM, our ability to enhance the 1T-SRAM technology or develop new technologies, the level of intellectual property protection provided by our patents, the vigor and growth of markets served by our licensees and customers, and the termination of our merger agreement with Synopsys, Inc. and operations of the Company and other risks identified in the Company’s most recent annual report on Form 10-K filed with the Securities and Exchange Commission, as well as other reports that MoSys files from time to time with the Securities and Exchange Commission. MoSys undertakes no obligation to update publicly any forward-looking statement for any reason, except as required by law, even as new information becomes available or other events occur in the future. Company Background

1T-SRAM licensees’ production

1T-SRAM licensing program

1T-SRAM memory chips

Memory chips

1991-1998 1998 1999 2000 + Target market : SOC

WorldwideWorldwide SOCSOC marketmarket forecastforecast (in(in $$ billions)billions)

4545 7%% : 227 RR: AGG 35 CCA 35

2727

2222 1717

20032003 2004 2004 2005 2005 2006 2006 2007 2007 Source:Source: SemicoSemico ResearchResearch CorporationCorporation SOCs: An Emerging Market

WorldwideWorldwide ICIC andand SOCSOC marketmarket forecastforecast (in(in $$ billions)billions)

$180$180 21%21%

$160$160 14%14% 19%19% 18%18% $140$140 13%13% ICIC MarketMarket ForecastForecast 12%12% $120$120 SOCSOC MarketMarket ForecastForecast

$100$100

$80$80

$60$60

$40$40

$20$20

$0$0 20022002 2003 2003 2004 2004 2005 2005 2006 2006 2007 2007

SOCsSOCs asas aa %% ofof worldwideworldwide ICIC marketmarket Source:Source: ETPETP 20032003 SOC Applications

High Density Low Cost

Digital cameras Digital camcorders

Wireless applications

Cell phones

LAN & WAN Switches

Network Routers Video Game Consoles

Consumer products

Low Power Consumption High Speed Embedded Memory Adoption Rate

TransitionTransition toto embeddedembedded memorymemory

10%10% 17%17% 29%29% 48%48%

80%80% % Area Logic

90%90% % Area Memory 83%83% 71%71% 52%52%

20%20%

19991999 2002 2002 2005 2005 2008 2008 2011 2011

Source:SIA,Source:SIA, ITRSITRS 20002000 1T-SRAM Royalty Market Potential

OverOver $900M$900M inin 20072007

SOCSOC marketmarket $45B$45B inin 20072007 4545 3535

2626

2222 ieess alltti 1818 yya RRoo 1414

20022002 2003 2003 2004 2004 2005 2005 2006 2006 2007 2007

Source: Semico Research Corporation Best of DRAM and SRAM

EmbeddedEmbedded DRAMDRAM 1T-SRAM Density Density

6T-SRAM6T-SRAM

SpeedSpeed 1T-SRAM is Unmatched

High Density 50-70% smaller

Low Cost 50-70% lower cost

Low Power Consumption 75% lower power consumption

High Speed SRAM performance

Ease of Manufacture Standard logic process

Ease of Use Simple standard interface 1T-SRAM Size Comparison

66 transistortransistor SRAMSRAM storagestorage cellcell 1T-SRAM1T-SRAM storagestorage cellcell Bit Line

Word Line Bit Line Bit Line

Word Line

5050-70%-70% lessless siliconsilicon areaarea OverOver 70%70% lessless costcost 1T-SRAM SOC Cost Savings*

LICENSEELICENSEE MOSYSMOSYS 66 MBITSMBITS SAVINGSSAVINGS ROYALTYROYALTY 6T6T-SRAM-SRAM $3.00$3.00 $1.20$1.20 MEMORYMEMORY 66 MBITSMBITS 1T1T-SRAM-SRAM MEMORYMEMORY

2M2M GATESGATES 2M2M GATESGATES LOGICLOGIC LOGICLOGIC

* Model based on $0.20 per mbit Our Technology is Protected

Proprietary,Proprietary, MoSys-inventedMoSys-invented technologytechnology

ProtectedProtected byby 7373 U.S.U.S. andand 3838 foreignforeign patentspatents

DifficultDifficult toto replicatereplicate

Multi-BankMulti-Bank®® ArchitectureArchitecture PipelinedPipelined Self-timedSelf-timed AccessAccess RefreshRefresh ManagementManagement CircuitryCircuitry LeakageLeakage SuppressionSuppression CircuitryCircuitry 1T-SRAM Product Roadmap

1T1T-SRAM-Q:-SRAM-Q: QuadQuad DensityDensity

1T1T-SRAM-R-SRAM-R :: HighHigh ReliabilityReliability andand QualityQuality

1T1T-SRAM-M-SRAM-M :: LowerLower power,power, mobilemobile applicationsapplications

1T1T-SRAM-SRAM

20012002 2003 1T-SRAM® Technology Options

1T-SRAM-M™1T-SRAM-M™ (Mobile) (Mobile) –– Lowest Lowest RAMRAM standbystandby powerpower forfor mobilemobile applicationsapplications –– 0.13µ 0.13µ standby standby downdown toto 10µA/Mbit10µA/Mbit withwith datadata retentionretention

1T-SRAM-R™1T-SRAM-R™ –– Transparent Transparent ErrorError Correction™Correction™ technologytechnology –– Dramatically Dramatically reducereduce SERSER

1T-SRAM-Q™1T-SRAM-Q™ –– 4X 4X thethe DensityDensity ofof 6T6T SRAMSRAM Soft Error Susceptibility

10,000,000

1,000,000

100,000

10,000

1,000

100 FITs/Mb (200MHz) FITs/Mb

10 1T-R

1 0.25µ 0.18µ 0.15µ 0.13µ

Process Generation

1T-SRAM Pseudo-6T 6T-SRAM

Source: MoSys 1T-SRAM-Q1T-SRAM-Q™™

Cap plate Cap plate G G G G G G STI STI well well 1T-SRAM1T-SRAM 1T-SRAM-Q1T-SRAM-Q

LeveragesLeverages StandardStandard LogicLogic ProcessProcess OnlyOnly 11 extra,extra, non-criticalnon-critical maskmask IncreasedIncreased PerformancePerformance ShorterShorter wireswires == fasterfaster && lowerlower powerpower UsesUses TransparentTransparent ErrorError CorrectionCorrection™™ IncreasedIncreased DensityDensity –– 4X 4X DenserDenser ThanThan 6T6T SRAMSRAM FoldedFolded AreaArea CapacitorCapacitor™(FAC™(FAC ™)™)

17 1T-SRAM Process Life Cycle

0.090.09 µmµm

0.130.13 µmµm 0.15 µm

0.18 µm Density 0.22 µm

0.25 µm

1999 2000 20012002 2003 1T-SRAM Technology Distribution

Custom Macros • Customized designs for optimum performance and cost efficiencies Standard Macros • Standard memory blocks accelerating customers’ time-to-market Technology Partners • Licensees included Fujitsu, TSMC and UMC Acceptance by Industry Leaders

CommunicationsCommunications ConsumerConsumer

Matsushita Communications Industrial

FoundryFoundry Volume Production Proven

More than 100 1T-SRAM licensed macro designs delivered

More than 80 million licensed chips shipped by our licensees Current Applications

•• InIn Production:Production: •• CellCell PhonePhone handsetshandsets •• VideoVideo gamegame consolesconsoles •• DigitalDigital camerascameras andand camcorders*camcorders* •• 10/100/Giga10/100/Giga EthernetEthernet switches*switches* •• FlatFlat panelpanel displaydisplay controllercontroller

•• InIn Development:Development: ••CellCell phonephone handsets*handsets* •• WirelessWireless LANLAN ••CellCell phonephone basebase stationstation •• DigitalDigital imagingimaging devicesdevices ••MP3MP3 PlayersPlayers •• DataData StorageStorage ••DVDDVD controllers*controllers* •• MeasureMeasure andand TestTest EquipmentEquipment ••HomeHome NetworkingNetworking ** IndicatesIndicates multiplemultiple projectsprojects Revenue Streams

Licensing • Fees paid by customers for development of memory design

Royalties • Payments made by customers on product sales utilizing the 1T-SRAM technologies Licensing Activities

Licensing • License Fees • $200k to $500k per macro

RoyaltiesRoyalties •• 2% 2% toto 5%5% ofof SOCSOC sellingselling priceprice •• All All licenseeslicensees paypay royaltiesroyalties •• No No upperupper limitslimits Typical License Agreement

50%50% 25%25% 25%25% LicenseLicense LicenseLicense LicenseLicense feefee paidpaid feefee paidpaid feefee paidpaid RoyaltiesRoyalties 2%2% toto 5%5%

∆∆ ∆∆ ∆∆ ∆∆ ∆∆ //// StartStart MonthMonth 44 MonthMonth 9-129-12 MonthMonth 12-1812-18 MonthMonth 18-2418-24

SignedSigned DesignDesign VerificationVerification ProductionProduction ReceiptReceipt ofof ContractContract DeliveredDelivered ofof DesignDesign StartStart RoyaltiesRoyalties Synopsys - Overview

February 23, 2004 • Signed Merger Agreement with Synopsys @ $13.50/share

April 16, 2004 • Termination of Merger Agreement with Synopsys

April 19, 2004 • MoSys announces $25M stock repurchase program

April 23, 2004 • MoSys initiates lawsuit against Synopsys

July 9, 2004 • Settlement of lawsuit with Synopsys Investment Foundation

ExpandingExpanding MarketsMarkets

+ Unmatched,Unmatched, patentedpatented 1T-SRAM1T-SRAM®® technologytechnology + PremierPremier CustomersCustomers && ExpandingExpanding SalesSales EffortsEfforts + LicenseLicense andand RoyaltyRoyalty BusinessBusiness ModelModel + StrongStrong andand ExperiencedExperienced ManagementManagement TeamTeam Shareholder Growth Value