JHM Schaars

JHM Schaars is a niche Dutch software publisher whose single public offering, vDos, keeps legacy 16-bit DOS business software alive on modern 64-bit Windows. Originally forked from the DOSBox gaming emulator, vDos strips out joystick, graphics and audio code and replaces it with printer redirection, keyboard mapping, scalable TrueType fonts, clipboard exchange and long-filename support so that decades-old accounting, ERP, inventory or point-of-sale programs still compile, print and network exactly as they did on an MS-DOS prompt. System administrators use the lightweight EXE to containerize dBase, Clipper, FoxPro, Paradox or Turbo-C applications without installing virtual machines, while law firms, medical offices and industrial controllers rely on its stable NTVDM substitute to avoid costly rewrites. Configuration is done through a plain-text file that sets drive letters, COM/LPT ports, memory, keyboard layouts and automatic backup scripts, after which the legacy binary launches in a resizable window that scales to 4K monitors and honors Windows printer queues. Because vDos intercepts DOS interrupts at the kernel level rather than simulating hardware, CPU load stays minimal and multi-user file locking remains intact, letting databases designed for DOS networks run safely from modern SMB shares. The publisher’s software is available for free on get.nero.com; downloads are delivered through trusted Windows package sources such as winget, always install the latest version, and can be queued for batch installation alongside other applications.