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      <link:linkbaseRef xlink:type="simple" xlink:href="daio-20260630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="daio-20260630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="daio-20260630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/currency/2025" schemaLocation="https://xbrl.sec.gov/currency/2025/currency-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <import namespace="http://fasb.org/srt-types/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd" />
  <import namespace="http://fasb.org/us-types/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd" />
  <import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd" />
  <import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd" />
  <element id="daio_AccruedCompensation" name="AccruedCompensation" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ConvertibleSubordinatedDebtOutstanding" name="ConvertibleSubordinatedDebtOutstanding" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_StockAwardsIssuedNetOfTaxWithheldShares" name="StockAwardsIssuedNetOfTaxWithheldShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="daio_StockAwardsIssuedNetOfTaxWithheldAmount" name="StockAwardsIssuedNetOfTaxWithheldAmount" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_StockIssuedDuringPeriodValueEmployeeStockPurchasePlans" name="StockIssuedDuringPeriodValueEmployeeStockPurchasePlans" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_CommonStockIssuedInPrivatePlacementShares" name="CommonStockIssuedInPrivatePlacementShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="daio_CommonStockIssuedInPrivatePlacementAmount" name="CommonStockIssuedInPrivatePlacementAmount" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_AdjustmentsToEquipmentTransferredToCostOfGoodsSold" name="AdjustmentsToEquipmentTransferredToCostOfGoodsSold" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ProceedsFromSaleOfAssets" name="ProceedsFromSaleOfAssets" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ProceedsFromIssuanceOfCommonStockAmount" name="ProceedsFromIssuanceOfCommonStockAmount" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_CashPaidDuringThePeriodAbstract" name="CashPaidDuringThePeriodAbstract" nillable="true" abstract="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="daio_PriorPeriodRevisionsDisclosureTextBlock" name="PriorPeriodRevisionsDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="daio_PrivatePlacementDisclosureTextBlock" name="PrivatePlacementDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeaseTableTextBlock" name="ScheduleOfFutureMinimumRentalPaymentsForOperatingLeaseTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="daio_SupplementalBalanceSheetInformationTableTextBlock" name="SupplementalBalanceSheetInformationTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ScheduleOfWarrantsIssuedAndOutstandingTableTextBlock" name="ScheduleOfWarrantsIssuedAndOutstandingTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="daio_SalesReturnReserve" name="SalesReturnReserve" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_OtherTaxesPayable" name="OtherTaxesPayable" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_SeveranceAccrual" name="SeveranceAccrual" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ProductWarrantyAccrualRevision" name="ProductWarrantyAccrualRevision" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_AccruedLiabilitiesAmount" name="AccruedLiabilitiesAmount" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_LesseeOperatingLeaseLiabilitiesPaymentsDue" name="LesseeOperatingLeaseLiabilitiesPaymentsDue" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_TotalOperatingLeaseLiability" name="TotalOperatingLeaseLiability" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_LesseeOperatingLeaseLiabilityNoncurrentAmount" name="LesseeOperatingLeaseLiabilityNoncurrentAmount" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_IncomeTaxExpenseBenefits" name="IncomeTaxExpenseBenefits" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_EmployeeStockOptionsAndAwards" name="EmployeeStockOptionsAndAwards" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_AdjustedWeightedAverageSharesAssumedConversionsOfStockOptions" name="AdjustedWeightedAverageSharesAssumedConversionsOfStockOptions" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="daio_EarningsPerShareBasicAndDilutedAbstract" name="EarningsPerShareBasicAndDilutedAbstract" nillable="true" abstract="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="daio_WeightedAverageNumberOfSharesOutstandingPerformanceStockUnits" name="WeightedAverageNumberOfSharesOutstandingPerformanceStockUnits" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="daio_WeightedAverageNumberOfSharesOutstandingStockOptions" name="WeightedAverageNumberOfSharesOutstandingStockOptions" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="daio_SharesOutstandingOptionsToPurchase" name="SharesOutstandingOptionsToPurchase" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnits" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnits" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceStockUnits" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceStockUnits" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="daio_EmployeesExpenses" name="EmployeesExpenses" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_NetSalesAmount" name="NetSalesAmount" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_WarrantsIssuedDate" name="WarrantsIssuedDate" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="daio_WarrantExpirationDate" name="WarrantExpirationDate" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="daio_CommonStocksConvertiblefromPreferredStocks" name="CommonStocksConvertiblefromPreferredStocks" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ConversionPriceDescription" name="ConversionPriceDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="daio_UnamortizedDiscountOnDebt" name="UnamortizedDiscountOnDebt" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_TotalIssuanceCosts" name="TotalIssuanceCosts" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_CouponInterest" name="CouponInterest" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="daio_OtherAccruedLiabilitiesAbstract" name="OtherAccruedLiabilitiesAbstract" nillable="true" abstract="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="daio_ContingenciesAbstract" name="ContingenciesAbstract" nillable="true" abstract="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="daio_PriorPeriodRevisionAbstract" name="PriorPeriodRevisionAbstract" nillable="true" abstract="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="daio_PrivatePlacementAbstract" name="PrivatePlacementAbstract" nillable="true" abstract="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element name="AdapterSalesMember" id="daio_AdapterSalesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="CostOfGoodsSoldMember" id="daio_CostOfGoodsSoldMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="SoftwareServicesSalesMember" id="daio_SoftwareServicesSalesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="LyttonKambaraFoundationMember" id="daio_LyttonKambaraFoundationMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="AliceWLyttonFamilyLLCMember" id="daio_AliceWLyttonFamilyLLCMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="TermsOfSeriesBConvertiblePreferredStockMember" id="daio_TermsOfSeriesBConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="PlatformSalesMember" id="daio_PlatformSalesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="SellingGeneralAndAdministrativeMember" id="daio_SellingGeneralAndAdministrativeMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="SoftwareAndMaintenanceSalesMember" id="daio_SoftwareAndMaintenanceSalesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="SoftwareandServicesSalesMember" id="daio_SoftwareandServicesSalesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
</schema>
