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Electronics

First-generation all transistor logic with core memory.

Transistors are Germanium PNP

Telefunken AF 138 PNP High Frequency
Telefunken AC 122 PNP Audio Frequency
COSEM 2N1990
Texas Instruments SS1280

Architecture, Memory & Speed

15 displayed digits with negative sign indicator

Digit encoding and processing architecture to be determined

Core memory, 5 arrays of 8 x 8 = 320 cores

Master clock, core cycle, full-number time to be determined

Construction

Mechanical and electronic construction is very similar to the RAE 4/15.

The electronics are constructed on 14 single-sided phenolic PCBs. The double-ended PCB design is carried over from the RAE 4/15, this brings along the inconvenience of requiring an extender card and a flying lead for in-circuit testing of a PCB.

The steel chassis is carried over from the RAE 4/15, together with the large cooling fan. The same keyboard design is used with microswitches for key contacts.