An AT form factor motherboard

A standard AT form-factor FIC VA 503+ motherboard, and a close-up view of its Super-Socket-7 processor socket. In consecutive order, this AT form-factor (not ATX form-factor) motherboard has three long black ISA slots, three shorter white PCI slots, and a short brown AGP slot for a 2X AGP video card. The motherboard has four SIMM sockets for EDO SIMM RAM memory modules, and two DIMM sockets for SDRAM memory modules. Both types of memory cannot be installed at the same time, only one type - SIMM or DIMM memory modules. Some other motherboards allow the use of both types at once.