PDP-8 line unit (19 Oct 1970) (Engineering Materials). [3 drawings and text (8 pages)]
Drawings are given for a PDP-8 Line Unit which allows communication between a PDP-8 and any computer Adapter which uses Line Unit conventions for expansion of the full-duplex teletype capability. Initial connections will be made to CDC 6600 systems and 7600 systems. The PDP-8 Line Unit provides a half-duplex, parallel 12 bit data path between PDP-8 core memory and an Adapter. Control and status signals are identical to those used with the PDP-6 Line Unit with the exception of an additional status signal called ''Overflow''. The PDP-8 Line Unit will send the Overflow signal to the Adapter if an attempt to transfer the file to the PDP-8 which exceeds its Word Count, or an error condition (IER, SER or Timeout) is detected by the Line Unit on a PPU Read operation. The PDP-8 transfers information to or from PDP-8 core memory by use of the Three Cycle Data Break facility. Two consecutive core memory locations provide work count and core address for the block transfer and are each incremented in sequence prior to transferring a 12 bit data word on the third memory cycle, hence the term, ''Three Cycle Data Break''.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- OSTI ID:
- 7278549
- Report Number(s):
- CAPE-2449
- Country of Publication:
- United States
- Language:
- English
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