3041

3041 is the 5.25 inch Disk Controller.

Introduction
It is a ND-100 disk controller, for hard disk drives with ST-506 interface.

Switches and indicators
From top of the card setting 10-15 is not reserved.
 * LED 7 - red - VCO lock (Voltage Control OK)
 * LED 1 - yellow - read
 * LED 2 - yellow - write
 * LED 3 - yellow - parity
 * LED 4 - yellow - compare
 * LED 5 - yellow - active
 * LED 6 - red - error
 * thumbwheel switch - device number
 * 0 - device address 500-507 (octal) - ident code 1 (octal) - the first 5.25 inch, 8 inch or 10 MB controller
 * 1 - device address 510-517 (octal) - ident code 5 (octal) - the second 5.25 inch, 8 inch or 10 MB controller
 * 2 - device address 520-527 (octal) - ident code 3 (octal) - reserved for magtape 1
 * 3 - device address 530-537 (octal) - ident code 7 (octal) - reserved for magtape 2
 * 4 - device address 540-547 (octal) - ident code 2 (octal) - reserved for drum 1
 * 5 - device address 550-557 (octal) - ident code 6 (octal) - reserved for drum 2
 * 6 - device address 600-607 (octal) - ident code 4 (octal) - reserved for versatec 1
 * 7 - device address 1600-1607 (octal) - ident code 14 (octal) - reserved for versatec 2
 * 8 - device address 1540-1547 (octal) - ident code 17 (octal) - reserved for SMD 1
 * 9 - device address 1550-1557 (octal) - ident code 20 (octal) - reserved for SMD 2

Connectors
The A and B connectors are used for I/O, the C connector is used for the ND-100 Bus.

I/O Devices on the card
not described yet.