The circuit board is a "Corvus Systems IBM Interface". Three quarters of the board are covered in components including transistors, resistors, integrated circuits and one gray connector on the right side. On the back, there is a repeating pattern of "L" printed in red. There are two test stamps, circular with "10" printed in the middle.
Date
1981
Manufacturer
Corvus Systems
Place Manufactured
Made in USA
Identifying Numbers
Other number
11
Stamped/ written on the right edge on the back.
Other number
1710-01817 REC C
Soldered along the top edge on the back.
Other number
27
Stamped in the bottom right corner.
Other number
8039 REV E
Printed in white in the upper left corner of the board.
Other number
A31
Soldered in the bottom left corner.
Other number
B1
Soldered in the lower left corner on the back.
Other number
B31
Soldered along the bottom edge.
Other number
M 99
Stamped in red on a circular white sticker in the bottom right corner on the front.