Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/realmodemem-vgamem/readme

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there was a off by one error when reading the end of the 1mb range causing it to
return bad offset/count. code changed to also allow write access to the vga
framebuffers (0xa0000-0xaffff) and (0xb0000-0xbffff) so realemu can propery
switch to text mode and clear the framebuffer.

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