PDP-11/05 to Electron Beam Intensity Modulation Unit Interface.
Abstract
The result of this investigation is a design for an interface system which can be used to interface a Digital Electronic Corporation PDP-11/05 minicomputer with electron beam control electronics (EBCE). The EBCE is part of a deformable thermoplastic phase plate brassboard used for optical phase modulation in the Air Force Avionics Laboratory (AFAL/DHO). The interface is a modular design made up of a unibus interface, buffer, input control, output control, master control, and a digital to analog (D/A) converter. The buffer module uses two first-in-first-out (FIFO) buffers to alternately accept data from the PDP-11 and send data to the EBCE via the D/A converter. The 16 bit word of the PDP-11 is multiplexed into 8 bit data words for interface manipulation, since 8 bits offer adequate resolution for the EBCE. The interface is designed to allow writing of a 100 x 100 element matrix on the phase plate. This requires a 1.45 element/sec modulation rate of the analog signal sent to the EBCE. The use of a dual FIFO system, a multiplexed computer word, and a very fast D/A converter make this modulation rate possible. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1976
- Accession Number
- ADA034028
Entities
People
- James R. Crowder
Organizations
- Air Force Institute of Technology