IBM MCA card to ID.

As I said, it is just simple black large box made for IBM, no provisions for mounting HDs, requires 220V power ONLY, front is HEX keypad w/ 4 digit LED (small!) Basically, oversized box to shuttle data between two different connections, basically to hold PSU, motherboard and all 8 cards, there's no openings for the I/O ports like vga, etc. To mount a little hd 30MB (!!) IBM used a MCA pass through card w/ MCA HD mounted on it, then it's plugged into topmost slot and kept in place from wobbling via a simple bent piece of sheetmetal and three screws. Two on card, one to chassis. It's made of heavy gauge steel so it is HEAVY and large. appox 9U rack but it doesn't have holes for rack ears so I left it behind. Top 4 screws uncrews 1/4 turn, take off top plate for card access. Loosen but not remove 8 screws (4 per side, slide them off by pulling upwards if needed for better access to other parts. Later 3172's (002 and 003) is based on 85 or 95 motherboard using dx2 50 complex card and at minimum 8MB installed. Newer boxens are now much efficient and vastly compact than this early days types. Cheers, Wizard