SUNNYVALE, Calif.–(BUSINESS WIRE)–May 6, 2004–Monolithic System
Technology, Inc. (MoSys), (Nasdaq:MOSY) today reported financial
results for its first quarter ended March 31, 2004.

Financial Results

Total net revenue in the quarter was $4.5 million, compared to the
$3.4 million reported in the fourth quarter 2003 and the $7.9 million
in first quarter of 2003. Total net revenue consisted of $3.0 million
from licensing, $1.4 million in royalties and approximately $162,000
in product revenue. Licensing revenue for the current quarter
increased from the $1.9 million reported in the fourth quarter of 2003
and decreased from the $4.5 million reported in the same period last
year. Royalty revenue increased from $1.1 million reported in the
fourth quarter of 2003 but decreased from the $2.9 million in the same
period last year. Product revenue decreased from the $334,000 reported
in the previous quarter and the $544,000 reported in the first quarter
of 2003. The gross margin percentage in the first quarter of 2004 was
88.3% compared to 87.1% in the first quarter of 2003 and up from 79.6%
in the fourth quarter of 2003.

Net loss for the quarter under generally accepted accounting
principles (GAAP) was $521,000 or ($0.02) per share, which included
approximately $900,000 of operating expenses, ($700,000 on a net tax
basis) associated with the planned acquisition of MoSys by Synopsys.
The results for the quarter compare to net income of $2.7 million, or
$0.09 fully diluted earnings per share, in the same period last year.
Excluding expenses associated with the Synopsys acquisition, pro forma
net income for the quarter was $190,000 or $0.01 earnings per fully
diluted share. A reconciliation of GAAP results to pro forma results
has been provided in the financial statement tables following the text
of this press release.

Commenting on the results of the first quarter, Dr. Fu-Chieh Hsu,
CEO of MoSys stated, “We are pleased with the increases in both
licensing and royalty revenue over the previous quarter which brought
total revenue in line with our previously stated guidance.
Additionally, excluding expenses associated with the anticipated
acquisition of our company by Synopsys, MoSys has returned to
profitability.”

Dr. Hsu further stated, “During the quarter we were preparing our
company for a smooth integration into Synopsys and believe we fully
satisfied all requirements of the acquisition agreement. Although this
transaction has not as yet come to a final resolution, we continue to
address this matter proactively. Additionally, we remain focused on
being a leader in providing innovative SOC solutions for high-density
memory applications and continue to have strong relationships with our
existing customer base. We believe MoSys is positioned to take
advantage of the growth in the SOC market as the need for greater
memory in smaller footprints continues to increase and we continue to
execute our business plan.”

Recent Developments in UniRAM litigation

On April 30, 2004, UniRAM Technology, Inc. (“UniRAM”) sought
permission from the court to drop its infringement claims related to
one of two patents that UniRAM had previously alleged were infringed
by MoSys. This development came only one month after UniRAM filed
suit, and is apparently in response to MoSys’ Answer and Counterclaim
filed April 21, 2004. Management believes that UniRAM’s remaining
patent-infringement claim and trade secret allegations are without
merit and MoSys will ultimately prevail.

Business Outlook

MoSys’ President and Chief Executive Officer Dr. Fu-Chieh Hsu and
Chief Financial Officer, Mark Voll will update their business outlook
and give guidance for the second quarter of 2004 during their earnings
conference call at 2:15 P.M. PT on May 6, 2004.

First Quarter Financial Results Web cast/Conference Call

The MoSys management team will host a live web cast and conference
call to discuss Q1 2004 financial results beginning at 2:15 P.M. PT
on Thursday, May 6, 2004. Investors and other interested parties may
listen to the live web cast by visiting the investor relations’
section of the MoSys web site at www.mosys.com. A replay of the
conference call will be available for 24 hours beginning at 5 P.M. PT.
The replay number is 1-888-286-8010 with a pass code of 28838597. A
web cast replay will also be available on the company’s Web site.

About MoSys

Founded in 1991, MoSys (Nasdaq:MOSY), develops, licenses and
markets innovative memory technologies for semiconductors. MoSys’
patented 1T-SRAM technologies offer a combination of high density, low
power consumption, high speed and low cost unmatched by other
available memory technologies. The single transistor bit cell used in
1T-SRAM memory results in the technology achieving much higher density
than traditional four or six transistor SRAMs while using the same
standard logic manufacturing processes. 1T-SRAM technologies also
offer the familiar, refresh-free interface and high performance for
random address access cycles associated with traditional SRAMs. In
addition, these technologies can reduce operating power consumption by
a factor of four compared with traditional SRAM technology,
contributing to making them ideal for embedding large memories in
System on Chip (SoC) designs. MoSys’ licensees have shipped more than
65 million chips incorporating 1T-SRAM embedded memory technologies,
demonstrating excellent manufacturability in a wide range of silicon
processes and applications. MoSys is headquartered at 1020 Stewart
Drive, Sunnyvale, California 94085. More information is available on
MoSys’ Web site at http://www.mosys.com.

Forward-Looking Statements

This press release may contain forward-looking statements about
the Company including, without limitation, benefits and performance
expected from use of the Company’s 1T-SRAM technology.

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 technology,
proving our technology in high-volume production of licensees’
integrated circuits, the level of commercial success of licensees’
products such as the Nintendo GAMECUBE and cell phone hand sets, ease
of integration of our 1T-SRAM with other semiconductor functions, 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,
the impact of our acquisition of ATMOS Corporation and the purported
termination of our merger agreement with Synopsys, Inc. on future
operating results 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.

1T-SRAM(R) is a MoSys trademark registered in the U.S. Patent and
Trademark Office. All other trade, product, or service names
referenced in this release may be trademarks or registered trademarks
of their respective holders.

Non-GAAP Financial Measurements

In addition to the GAAP results provided by this document, the
company has provided non-GAAP financial measurements that present net
income and net income per share on a basis excluding non-recurring
expenses associated with the Synopsys acquisition. Details of these
excluded items are presented in the table below, which reconciles the
GAAP results to non-GAAP financial measurements described in this
press release. Also, this press release and the reconciliation from
GAAP results to these and other additional non-GAAP financial
measurements that may be discussed in the Q1 2004 earnings conference
call can be found on the company’s Web site at www.mosys.com


                 MONOLITHIC  SYSTEM TECHNOLOGY, INC.
           CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
               (In thousands, except per share amounts)

                                                 Three Months Ended
                                                      March 31,
                                                  2004        2003
                                               ----------- -----------
                                               (unaudited) (unaudited)
Net Revenue
  Product                                            $162        $544
  Licensing                                         2,988       4,513
  Royalty                                           1,353       2,856
                                               ----------- -----------
    Total                                           4,503       7,913
                                               ----------- -----------

Cost of Net Revenue
  Product                                             150         407
  Licensing                                           375         615
                                               ----------- -----------
    Total                                             525       1,022
                                               ----------- -----------
Gross Profit                                        3,978       6,891
                                               ----------- -----------

Operating Expenses:
  Research and  development                         2,206       2,245
  Selling, general and administrative               2,758       1,670
  Stock-based compensation expense                     26         126
                                               ----------- -----------
    Total operating expenses                        4,990       4,041
                                               ----------- -----------

  Income (loss) from operations                    (1,012)      2,850
  Interest and other income                           361         490
                                               ----------- -----------

  Income (loss) before income taxes                  (651)      3,340
  Benefit (provision) for income taxes                130        (668)
                                               ----------- -----------

Net Income (Loss)                                   $(521)     $2,672
                                               =========== ===========

Net Income (Loss) Per Share
  Basic                                            ($0.02)      $0.09
                                               =========== ===========
  Diluted                                          ($0.02)      $0.09
                                               =========== ===========


Shares Used in Computing Net Income
 (Loss) Per Share
    Basic                                          30,845      30,302
    Diluted                                        30,845      30,539

                    Non-GAAP Financial Measurements

    In addition to the GAAP results provided by this document, the
company has provided non-GAAP financial measurements that present net
income and net income per share on a basis excluding non-recurring
expenses associated with the Synopsys acquisition. Details of these
excluded items are presented in the table below, which reconciles the
GAAP results to non-GAAP financial measurements described in this
press release. Also, this press release and the reconciliation from
GAAP results to these and other additional non-GAAP financial
measurements that may be discussed in the Q1 2004 earnings conference
call can be found on the company's Web site at www.mosys.com.


                  MONOLITHIC SYSTEM TECHNOLOGY, INC.
 RECONCILIATION OF GAAP TO PRO FORMA NON-GAAP CONSOLIDATED NET INCOME
                            (In thousands)

                                                 Three Months Ended
                                                      March 31,
                                                  2004        2003
                                               ----------- -----------
                                               (unaudited) (unaudited)

Net Income (Loss) (GAAP)                            $(521)     $2,672
  Adjustments:
  Expenses associated with Synopsys
   acquisition                                        711          --
                                               ----------- -----------
Net Income (Pro Forma Non-GAAP)                      $190      $2,672
                                               =========== ===========



                 MONOLITHIC  SYSTEM TECHNOLOGY, INC.
  PRO FORMA NON-GAAP CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
               (In thousands, except per share amounts)


                                                 Three Months Ended
                                                      March 31,
                                                  2004        2003
                                               ----------- -----------
                                               (unaudited) (unaudited)
Net Revenue
  Product                                            $162        $544
  Licensing                                         2,988       4,513
  Royalty                                           1,353       2,856
                                               ----------- -----------
    Total                                           4,503       7,913
                                               ----------- -----------

Cost of Net Revenue
  Product                                             150         407
  Licensing                                           375         615
                                               ----------- -----------
    Total                                             525       1,022
                                               ----------- -----------
Gross Profit                                        3,978       6,891
                                               ----------- -----------

Operating Expenses:
  Research and  development                         2,203       2,245
  Selling, general and administrative               1,873       1,670
  Stock-based compensation expense                     26         126
                                               ----------- -----------
    Total operating expenses                        4,102       4,041
                                               ----------- -----------

  Pro Forma Income (loss) from operations            (124)      2,850
  Interest and other income                           361         490
                                               ----------- -----------

  Pro Forma Income before income taxes                237       3,340
  Provision for income taxes                          (47)       (668)
                                               ----------- -----------

Pro Forma Net Income                                 $190      $2,672
                                               =========== ===========

Pro Forma Net Income Per Share
  Basic                                             $0.01       $0.09
                                               =========== ===========
  Diluted                                           $0.01       $0.09
                                               =========== ===========


Shares Used in Computing Pro Forma Net Income
 Per Share
    Basic                                          30,845      30,302
    Diluted                                        31,651      30,539




                  MONOLITHIC SYSTEM TECHNOLOGY, INC.
                 CONDENSED CONSOLIDATED BALANCE SHEETS
                            (in thousands)

                                                 March      December
                                                   31,         31,
                                                  2004        2003
                                               ----------- -----------
                                               (unaudited)  (audited)
Assets
Current Assets
  Cash, cash equivalents and short-term
   investments                                    $42,803     $41,365
  Accounts receivable -- net                          609       1,027
  Unbilled contract receivable                      2,152       1,106
  Inventories -- net                                  437         474
  Prepaid expenses and other assets                 2,700       3,822
                                               ----------- -----------
    Total Current Assets                           48,701      47,794

  Long-term investments                            46,320      44,462
  Property and equipment -- net                     1,545       1,796
  Goodwill                                         12,326      12,326
  Other Assets                                        513         514
                                               ----------- -----------
    Total Assets                                  109,405     106,892
                                               =========== ===========


Liabilities and Stockholders' Equity:
Current Liabilities:
  Accounts payable                                   $114        $116
  Accrued expenses and other liabilities            3,171       2,733
  Deferred revenue                                    208         506
  Current portion of capital lease obligations         11          13
                                               ----------- -----------
  Total Current Liabilities                         3,504       3,368

   Long term portion of capital lease
    obligations                                        11          13

  Common stock and additional paid in capital     102,356      99,456
  Retained earnings                                 3,534       4,055
                                               ----------- -----------
Total Stockholders' Equity                        105,890     103,511
                                               ----------- -----------

  Total Liability and Stockholders' Equity       $109,405    $106,892
                                               =========== ===========

CONTACT: MoSys, Sunnyvale
Mark Voll, 408-731-1800
or
Shelton IR, Dallas
Beverly Twing, 972-239-5119 x126
btwing@sheltongroup.com

SOURCE: Monolithic System Technology, Inc.