Whitehorn Ltd. Co. is a legacy system modernization firm serving government and enterprise organizations. We analyze, document, and modernize the aging systems your operations depend on - from COBOL and Informix-4GL to AS/400s and DOS-based platforms.
A clear path from assessment through execution.
Understand what you have before you decide what to do with it. We map your systems, dependencies, and risks - and deliver a modernization roadmap with options.
Learn more →Change the platform, preserve the application. Move off end-of-life hardware and unsupported operating systems to Azure, AWS, or Google Cloud.
Learn more →When the platform isn't the problem - the application is. Re-architect, migrate languages, rebuild data layers, or replace legacy systems entirely.
Learn more →We work where legacy systems are most critical - and most entrenched.
AS/400, COBOL, DOS, compliance-driven modernization
SCADA, timeseries, real-time monitoring
PCI DSS, SOC 2, transaction systems
Informix-4GL, warehouse systems, ERP
Whitehorn Ltd. Co. is the owner and maintainer of DR DOS®, a fully MS-DOS compatible operating system dating back to 1988. We don't just consult on legacy DOS platforms - we understand them at the source level. We offer custom builds, extended support contracts, and managed sunset strategies for organizations still running DOS-based systems.
Running systems you can't afford to lose - on platforms you can't afford to keep?
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