<The peripherals were never expandable, although a couple of engineers <supposedly tried hacking a hard disk interface off the stacking connector <in the 11/150. (An IDE interface would be slick if someone could do <it). The easiest way is to tweek the 8085 for the IO and use the floppy disk or Tu58 connector as its a simple 8bit bidirectional parallel path. the IDE side would have to have local smarts added. If you want to expand it go qbus... Allison