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      <link:roleType roleURI="http://www.cspi.com/role/DisclosureFinancingReceivablesNetNarrativeDetails" id="DisclosureFinancingReceivablesNetNarrativeDetails">
        <link:definition>99940501 - Disclosure - Financing receivables, net - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureFinancingReceivablesNetAllowanceForCreditLossRollforwardDetails" id="DisclosureFinancingReceivablesNetAllowanceForCreditLossRollforwardDetails">
        <link:definition>99940503 - Disclosure - Financing receivables, net - Allowance for credit loss - Rollforward (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureLeasesSupplementalCashFlowInformationDetails" id="DisclosureLeasesSupplementalCashFlowInformationDetails">
        <link:definition>99940702 - Disclosure - Leases - Supplemental cash flow information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureAccountsPayableAndAccruedExpensesAndOtherNoncurrentLiabilitiesDetails" id="DisclosureAccountsPayableAndAccruedExpensesAndOtherNoncurrentLiabilitiesDetails">
        <link:definition>99940801 - Disclosure - Accounts payable and accrued expenses, and Other noncurrent liabilities - (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureLineOfCreditNarrativeDetails" id="DisclosureLineOfCreditNarrativeDetails">
        <link:definition>99940901 - Disclosure - Line of Credit - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosurePensionAndRetirementPlansFairValueOfPlanAssetsDetails" id="DisclosurePensionAndRetirementPlansFairValueOfPlanAssetsDetails">
        <link:definition>99941002 - Disclosure - Pension and Retirement Plans - Fair value of plan assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureIncomeTaxesDetails" id="DisclosureIncomeTaxesDetails">
        <link:definition>99941101 - Disclosure - Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureFairValueOfFinancialAssetsAndLiabilitiesDetails" id="DisclosureFairValueOfFinancialAssetsAndLiabilitiesDetails">
        <link:definition>99941301 - Disclosure - Fair Value of Financial Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureSegmentInformationOperatingSegmentsDetails" id="DisclosureSegmentInformationOperatingSegmentsDetails">
        <link:definition>99941401 - Disclosure - Segment Information - Operating Segments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureSegmentInformationConcentrationsOfRiskDetails" id="DisclosureSegmentInformationConcentrationsOfRiskDetails">
        <link:definition>99941402 - Disclosure - Segment Information - Concentrations of Risk (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureDividendDetails" id="DisclosureDividendDetails">
        <link:definition>99941501 - Disclosure - Dividend (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureSubsequentEvents" id="DisclosureSubsequentEvents">
        <link:definition>995211601 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.cspi.com/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesOrganizationAndBusinessDetails" id="DisclosureBasisOfPresentationAndSignificantAccountingPoliciesOrganizationAndBusinessDetails">
        <link:definition>99940101 - Disclosure - Basis of Presentation and Significant Accounting Policies - Organization and Business (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:href="cspi-20260630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="cspi-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="cspi-20260630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="cspi-20260630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:import namespace="https://xbrl.org/2023/calculation-1.1" schemaLocation="https://www.xbrl.org/2023/calculation-1.1.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd" />
  <xsd:import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/ecd-sub/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-sub-2025.xsd" />
  <xsd:element name="CustomerAMember" id="cspi_CustomerAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CustomerBMember" id="cspi_CustomerBMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CustomerCMember" id="cspi_CustomerCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CustomerDMember" id="cspi_CustomerDMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CustomerEMember" id="cspi_CustomerEMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element id="cspi_NetIncomeLossAttributableToNonvestedCommonStock" name="NetIncomeLossAttributableToNonvestedCommonStock" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element name="PerformanceObligationPaymentTerms" id="cspi_PerformanceObligationPaymentTerms" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element id="cspi_WeightedAverageTotalSharesOutstandingBasic" name="WeightedAverageTotalSharesOutstandingBasic" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="cspi_ContractualReceivablesNetOfUnearnedIncome" name="ContractualReceivablesNetOfUnearnedIncome" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <xsd:element id="cspi_NetIncomeAttributableToCommonStockholders" name="NetIncomeAttributableToCommonStockholders" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="cspi_LiquidityRatio" name="LiquidityRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <xsd:element id="cspi_ActuarialAssumptionsUsedAxis" name="ActuarialAssumptionsUsedAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="cspi_ActuarialAssumptionsUsedDomain" name="ActuarialAssumptionsUsedDomain" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="cspi_InventoryLineOfCreditMember" name="InventoryLineOfCreditMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="cspi_LeaseDisclosureTextBlock" name="LeaseDisclosureTextBlock" nillable="true" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="cspi_ScheduleOfLeaseSupplementalCashFlowInformationTableTextBlock" name="ScheduleOfLeaseSupplementalCashFlowInformationTableTextBlock" nillable="true" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="cspi_IncreaseDecreaseInOperatingLeaseLiabilities" name="IncreaseDecreaseInOperatingLeaseLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="cspi_TechnologySolutionsSegmentMember" name="TechnologySolutionsSegmentMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="cspi_LeaseCostGross" name="LeaseCostGross" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="cspi_LineOfCreditCashWithdrawalLimit" name="LineOfCreditCashWithdrawalLimit" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="cspi_LineOfCreditCashWithdrawalOutstanding" name="LineOfCreditCashWithdrawalOutstanding" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="cspi_FinanceEquipmentLeasingMember" name="FinanceEquipmentLeasingMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="cspi_ScheduleOfAccountsPayableAndAccruedLiabilitiesAndOtherNonCurrentLiabilitiesTableTextBlock" name="ScheduleOfAccountsPayableAndAccruedLiabilitiesAndOtherNonCurrentLiabilitiesTableTextBlock" nillable="true" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="cspi_AccountsPayableAndAccruedLiabilitiesCurrentGross" name="AccountsPayableAndAccruedLiabilitiesCurrentGross" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="cspi_AccountsPayableAndAccruedLiabilitiesCurrentDiscount" name="AccountsPayableAndAccruedLiabilitiesCurrentDiscount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <xsd:element id="cspi_OtherLiabilitiesNoncurrentGross" name="OtherLiabilitiesNoncurrentGross" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="cspi_OtherLiabilitiesNoncurrentDiscount" name="OtherLiabilitiesNoncurrentDiscount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <xsd:element id="cspi_VendorAgreementMember" name="VendorAgreementMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="cspi_AccountsPayableAccruedLiabilitiesAndOtherNonCurrentLiabilitiesFairValueDisclosure" name="AccountsPayableAccruedLiabilitiesAndOtherNonCurrentLiabilitiesFairValueDisclosure" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="cspi_CustomerFinancingForInventorySold" name="CustomerFinancingForInventorySold" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element name="LineOfCreditDisclosureTextBlock" id="cspi_LineOfCreditDisclosureTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="SalesAbstract" id="cspi_SalesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CostOfSalesAbstract" id="cspi_CostOfSalesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NoncashVendorFinancingForPaymentToPurchaseOfInventory" id="cspi_NoncashVendorFinancingForPaymentToPurchaseOfInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="GarySouthwellMember" id="cspi_GarySouthwellMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AccountsReceivableNetCurrentTextBlock" id="cspi_AccountsReceivableNetCurrentTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="MaturityTermOfFinancingReceivable" id="cspi_MaturityTermOfFinancingReceivable" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="FinancingReceivableUnearnedInterestIncomeBeforeAllowanceForCreditLosses" id="cspi_FinancingReceivableUnearnedInterestIncomeBeforeAllowanceForCreditLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="FinancingReceivablesNonAccrualStatus" id="cspi_FinancingReceivablesNonAccrualStatus" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="HighPerformanceProductsSegmentMember" id="cspi_HighPerformanceProductsSegmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TransferredAtPointInTimeAsPrincipalMember" id="cspi_TransferredAtPointInTimeAsPrincipalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TransferredAtPointInTimeAsAgentMember" id="cspi_TransferredAtPointInTimeAsAgentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TransferredOverTimeAsPrincipalMember" id="cspi_TransferredOverTimeAsPrincipalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AmericasExcludingUnitedStatesMember" id="cspi_AmericasExcludingUnitedStatesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="UnitedKingdomSubsegmentMember" id="cspi_UnitedKingdomSubsegmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="UsSubsegmentMember" id="cspi_UsSubsegmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CustomerFMember" id="cspi_CustomerFMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="VictorDellovoMember" id="cspi_VictorDellovoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="GaryW.LevineMember" id="cspi_GaryW.LevineMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="MikeNewbanksMember" id="cspi_MikeNewbanksMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2026Q1DividendsMember" id="cspi_O2026Q1DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CustomerGMember" id="cspi_CustomerGMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2026Q2DividendsMember" id="cspi_O2026Q2DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2026Q3DividendsMember" id="cspi_O2026Q3DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
</xsd:schema>
