SECTION 2
part 1
part 2
part 3

SECTION 3
part 1
part 2
part 3
part 4
part 5

SECTION 4
part 1
part 2
part 3
part 4
part 5
part 6

Connectivity between IBM Mainframe and ICL Mainframe.

Details are classified, and will not be released until after 88 years.