IBM PC/XT

This computer was made available by someone who had recently purchased a new computer and heard that I collect old machines. It didn't start up properly when I got it...the memory settings had been misconfigured and something weird was also going on with the hard drive. It mostly works now, though I think the keyboard cable needs to be replaced. It can even log into my network and grab files off of the Linux server...it's slow, but no slower than pulling data off its own hard drive. It arrived with an IBM CGA monitor and a nice, clicky (and very heavy...this is IBM stuff, after all) 83-key keyboard. The computer is configured as follows:

A full 256K on the motherboard.
A Sigma Designs multi-function card with another 384K (for the 640K that Bill Gates said was all anybody would ever need), a couple of serial ports (one with a 16550A now), a parallel port, a joystick port, and a real-time clock. Between the switches on this card and the switches on the motherboard, the machine reported 512K when I received it; trial and error got it straightened out. The only thing I've not been able to get working is the clock; I have no driver for it, and Sigma Designs' website doesn't have anything appropriate for it (they're into video capture and playback these days).
IBM Color Graphics Adapter...the old-school full-length CGA card that "snows" during screen updates in some programs.
IBM full-length floppy controller, with one 5.25" DSDD (360K) drive.
No-name MFM hard disk controller of late-80s manufacture, driving a Seagate ST225 20MB 5.25" half-height hard drive...no doubt an upgrade or repair item installed by the previous owner, as IBM wouldn't have shipped it with a half-height drive of any kind.
Racal Interlan NI5210 ISA Ethernet adapter...I picked this one up at a local used-parts emporium, not knowing if I'd actually be able to get this old beast on my LAN and communicating with other systems.

The hard drive was low-level formatted and scanned for bad blocks; it now has loaded on it the DR DOS 6.0 that I bought years ago for the first 286 I built. I also installed the Microsoft Networking Client for DOS off of a Windows NT Server CD-ROM (copied to floppies, of course); that's how it's able to talk to my Samba server (it can also ping hosts on the Internet, but there's no other network software installed at this point).

Here's the out-of-the-box configuration for a PC/XT:

4.77-MHz 8088 (either Intel or AMD; mine's AMD, but my understanding is that Intel was providing full manufacturing data to AMD at this point as a condition of IBM using its processors).
64K-256K RAM, expandable to a maximum of 640K conventional memory and more memory through EMS (and maybe XMS, though I'm not sure of that...that might be a 286-and-up measure).
Eight 8-bit ISA expansion slots.
Two options for the display when it was released:
- MDA, 80x25 text only, monochrome
- CGA, 80x25 text in 16 colors, up to 320x200 2-color graphics
Detached keyboard with numeric keypad and 10 function keys.
Integrated DIP-16 joystick port.