dixon (10/10/82)
For those in BTL detailed information on the 212A modem can be obtained in the DL's (Deveolment Letters), EL's (Engineering Letters), and of course BSP's. All of these should be available at your local Engineering Records office (or is it ITDS now?). For example, the first DL for the 212A is DL Data Systems no. 272 and its supplements.