| Ulitmate EGA | 1988 | I.B.M and Compatibles | 8bit ISA | EGA Graphics Card | NFL Electronics Ltd. |
| UMC 85C408AF | 1995 | I.B.M and Compatibles | VGA Graphics Card | 16bit ISA | UMC |
| UMC 85C408AF | 1995 | I.B.M and Compatibles | VGA Graphics Card | 16bit ISA | UMC |
| UMC UM9003AF Network Card | 1994 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | UMC |
| UMC UM9003AF Network Card | 1994 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | UMC |
| UMC UM9008F Network Card | 1994 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | UMC |
| Unique UN-105 | 1991 | I.B.M and Compatibles | 16bit ISA | IDE Controller | Floppy Controller | Unique |
| UK0023 Ethernet Card | 1996 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | Unknown Manufacturer |
| UMC Parallel Port | 1991 | I.B.M and Compatibles | 8bit ISA | Parallel Port | UMC |
| U.S. Robotics Modem 14400 | 1994 | I.B.M and Compatibles | 8bit ISA | Modem | U.S. Robotics |
| U.S. Robotics Modem 28800 | 1995 | I.B.M and Compatibles | 8bit ISA | Modem | U.S. Robotics |
| Unique UN-105 | 1993 | I.B.M and Compatibles | 16bit ISA | IDE Controller | Floppy Controller | Unique |
| UMC UM9065L | 1991 | I.B.M and Compatibles | 8bit ISA | ARCNet Card | UMC |
| Unknown XT Mainboard | 1989 | I.B.M and Compatibles | 8bit ISA | Mainboard | 8088 | Unknown Manufacturer |
| Unknown 286 Mainboard 065-3.2-058 | 1989 | I.B.M and Compatibles | 8bit ISA | 16bit ISA | Mainboard | 80286 | Unknown Manufacturer |
| Unknown 286 Mainboard SX CPCB 450B-SS | 1990 | I.B.M and Compatibles | 8bit ISA | Mainboard | 80286 | Unknown Manufacturer |
| UMC AM-8887 | 1996 | I.B.M and Compatibles | PCI | 16bit ISA | Mainboard | 80486 | UMC |
| Unknown XT Mainboard AC1100-12 | 1989 | I.B.M and Compatibles | 8bit ISA | Mainboard | 8088 | Unknown Manufacturer |
| Unknown XT Mainboard | 1986 | I.B.M and Compatibles | 8bit ISA | Mainboard | 8088 | Unknown Manufacturer |
| Unknown Pentium Mainboard | 1998 | I.B.M and Compatibles | PCI | Sound Card | 16bit ISA | Parallel Port | IDE Controller | Floppy Controller | Serial Port | Mainboard | Pentium | Unknown Manufacturer |
| UMC UM9007F Network Card | 1995 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | UMC |
| UK0023 Ethernet Card | 1996 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | Unknown Manufacturer |
| Unknown 8bit Controller Card | 1987 | I.B.M and Compatibles | 8bit ISA | Unknown | Unknown Manufacturer |
| Unknown 8bit Controller Card PD-001 | 1987 | I.B.M and Compatibles | 8bit ISA | Unknown | Unknown Manufacturer |
| Unknown BUS Mouse | 1984 | I.B.M and Compatibles | Mouse | Retrobrite | BUS Mouse | Unknown Manufacturer |
| UMC VL-BUS Multi I/O | 1994 | I.B.M and Compatibles | Parallel Port | VL-BUS | IDE Controller | Floppy Controller | Serial Port | UMC |
| Unknown Development Board | 1988 | I.B.M and Compatibles | 8bit ISA | Prototyping | Unknown Manufacturer |