"This Eurocard (100 x 160mm) connects to the standard Acorn
bus and provides an interface to one or two disk drives. It is capable of
controlling four drive surfaces on two double-sided drives. Single or double
track density drives may be used.
The advanced 8271 controller integrated circuit is used to
relieve the CPU of many tasks associated with disk control. The IBM 3740 soft
sectored format (or its derivative for mini-floppies) is used.
The Acorn Disk Operating System (DOS) ROM provides
comprehensive commands for controlling the drives.
A 34-way flat ribbon cable connects to the drives after the Shugart interface standard.
See this section from the System 5 Manual System 5 Handbook Part 2 Section 5 Floppy Disk Controller Board [2]
200.004 Issue 4 [3 System 5]
