3 ms·
The IBM PS/1 had MS-DOS 4.01 in ROM. You could install newer versions on the hard drive, but I remember being bitterly disappointed on installing the 2.5MB RAM
by stonogo 6y ago
The IBM PS/1 had MS-DOS 4.01 in ROM. You could install newer versions on the hard drive, but I remember being bitterly disappointed on installing the 2.5MB RAM expansion, because the memory test slowed the boot process down tremendously.