This is a complicated technical and social problem, with no single solution. We also have competing priorities for what is the most important problem with WebAssembly to fix first.
VGA signals at these timings also use different sync polarities and timing parameters (front porch, back porch, sync pulse width) than what off-the-shelf adapters expect. Most display adapters refuse to go below 640x480. We needed something custom.
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IBM had its own chip fabrication plant in Burlington, Vt. and was capable of manufacturing CPUs. Eventually IBM did produce 386 and 486 CPUs, but not immediately. According to the April 10, 1989 issue of Infoworld, it wasn’t until early April 1989 that IBM exercised its option to start making 386 CPUs itself.