Codex Gamicus

Windows 3.00a is an update to the Windows 3.0 graphical operating system released by Microsoft Corporation in December 1990. Support officially ended on December 31, 2001. The OEM release Windows 3.0 + Multimedia Extensions 1.0 was based on this bugfix release.


Windows 3.00a is a bugfix release to Windows 3.0, and mostly revolved around fixing errors related to the Windows DOS Extender, where problems might occur when DOS programs are called into Real Mode despite Windows 3.0 being loaded in 386 Enhanced Mode. The installation process was also simplified, and several crashes related to printing, networking, and low-memory conditions were also fixed.

Minimum Specifications[]

MS-DOS MS-DOS Minimum/Recommended Specifications
Minimum Specifications Recommended Specifications
Operating System MS-DOS 3.1 or PC-DOS 3.1
CPU Intel-logo.svg 80286 CPU Intel-logo.svg 80386SX or 80386DX
RAM 640 KB conventional memory RAM 640 KB conventional memory and 256 KB extended memory
Graphics CGA, EGA, VGA, 8514/A, Hercules graphics card or compatible graphics card Graphics EGA or higher
Storage Hard disk required
Floppy Disk Drive A low-density (720 KB) 3.5" or 1.20 MB 5.25" Floppy Disk Drive is required for Installation.
Network/Connectivity Hayes or compatible modem for communications.
Input Microsoft Mouse or compatible