ORDINATOR floppy controller board
The floppy controller board of the ORDINATOR contains circuitry to control the two floppy drives of the system. The board uses a 1791 controller chip together with custom hardware to support on-board DMA and other functions such as drive, head and density selection.
The ORDINATOR floppy controller board is also described on pages 20-21 of the book "THE ORDINATOR PROJECT".