IBM PC XT 5150 4.77MHz, 640KB, no, not weird at all :)

The 5150 was just an "IBM PC" not an XT, but still... I think we're talking about the same thing.

I still have mine! 4.77 MHz 8088, 8087 math coprocessor, CGA graphics card, 5.25" floppy (360K, double-sided, double-density), 20 MB Seagate hard drive (I believe the motherboard has newer ROM chips to support that), AST SixPakPlus expansion card to bring it up to 640 KB RAM and a Parallel Port, a Serial Port, a Game Port, and a Real Time Clock (so you don't have to type in the date and time every bootup.) At one point I had a Sound Blaster as well, which was nice. The floppy drive and the hard drive each have their own controller cards so there's almost no more room for expansion! The motherboard also has the keyboard and cassette (!!!) port. I get an error code about the cassette port so I doubt it would work but I never had the equipment to try it out anyway.