Development of CAMAC data acquisition computer CCS-11

The CAMAC Control Subsystem for PDP-11 and VAX-11 (CCS-11) was developed from 1979 to 1980 as the computer for special high speed data acquisition using CAMAC system. Seven CCS-11's have been used by total 6 experimental groups so far in the National Laboratory for High Energy Physics, Japan. Thus, the initial purpose of development may have been sufficiently achieved. Data acquisition software ''KEKX'' developed by Chiba also largely contributed to this result. In this report, the progress and purpose of development and the design of the CCS-11 hardware are described. As a result of first investigating the data processing system for University of Tokyo meson facility (BOOM), a 32 bit miniature computer VAX-11/780 was used as the host computer, and a 16 bit computer was combined for data acquisition. VAX is a 32 bit computer produced by developing the well-known PDP-11. CCS-11 was constructed to have the functions that can execute all the PDP-11 instructions by skillfully writing microprograms, in spite of considerable hardware differences from PDP-11. Memory size is 24 Kwords as standard, of which 8 Kwords have specially high speed and contribute to improve operational speed, and other 16 Kwords are used mainly for data storing. CCS-11 can be easily linked to PDP-11 or VAX-11, and also the diagnoses of its major function can be performed using the PDP-11 diagnosis programs without any change. (Wakatsuki, Y.)