Computerhistorie: Control Data System 17 apparatuur

CDC System 17 computerapparatuurkarakteristieken

Hieronder volgt de beschrijving van het Control Data Corporation (CDC) System 17 en de randapparatuur zoals dat in gebruik was bij het TNO Physisch Laboratorium op de Waalsdorpervlakte tussen de jaren zeventig en tachtig.
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Type/Model Description
Single direct memory access channel connection. Controller has absolute cylinder addressing and a daisy chain capability to control up to four cartridge disk drives with seek-overlap capability in any combination. Occupies five pre-assigned positions in CPU enclosure.
Cartridge disk drive with voice coil positioning. Stores 2.2 million words on a fixed disk plus 2.2 words on a removable disk. Each disk has two surfaces, 400 tracks per surface, 29 sectors per track, and 96 words per sector. Average positioning time is 35 milliseconds. Rotational speed is 2400 rpm. Transfer rate is 156.000 words per second. Includes floor mount cabinet. Requires 848-29 disk cartridge (not included).
CDC 1732-2/615 7- and 9-track tape drive. 37.5 ips, 556/800 bpi NRZI and 1600 bpi Phased encoded (PE).
Papertape station 400 characters per second, paper tape reader capable of reading 5, 7 or 8 level tape, 150 characters per second paper tape punch, includes common control cabinet and power supply.
Digigraphics workstation
Digigraphic with light pen
Digigraphic with light pen

Vector-oriented 22 inch flat face CRT console, screen capacity up to 2000 inches of curves or up to 1800 characters of any size or font, includes character generator and light pen.
It required a controller that controls a single 274 graphics console for light pen-based computer-aided design, research and control application, contains 4096 words memory buffer, operates from one 1700 data channel. Cycle time was 1.67 microseconds; the refresh cycle was 25 ms.
TNO’s system had 8K words.

System 17 The Control Data Corporation (CDC) System 17 had the 1784 processor and a memory of 16 K words of 16 bits plus 2 parity bits each (=32 Kbyte). The processor cycle time was 0.9 μs. It had two index registers of 8 bits. Average processing time for an addition was 2 μs, multiplication 7 μs and divide 9 μs.
The System 17 evolved to System 18, a system that was the basis for the 2551 Data Communication computer. A 16 KWords version of the CDC 1700 was priced Dfl 368.617 in the Spring of 1969. Papertape equipment would cost some Dfl 50.000.  

System 17 (photo courtesy of
System 17(00) 
(photo courtesy of