I don’t think anything this complex happened. I imagine that OP ran out of UMB or HMA memory space and the CDROM driver or SHSUCDX failed to load properly.
On Wed, Sep 11, 2024 at 11:22 AM Frantisek Rysanek via Freedos-user < freedos-user@lists.sourceforge.net> wrote: > DOS on "modern" PC hardware struggles with too many IRQ sources > sharing just the few legacy IRQ lines/inputs = up to IRQ 15 included. >
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