The maximum size of the magnetic core memory was 16383 words.

The programmable program memory had a maximum size of 4096 words.

The computer could carry out approximately 7100 arithmetic operations per second at a clock rate of 180 kHz.

The Z25 could be used for the control and data acquisition of external devices through a program-interrupt system with up to 32 channels.

[2] This also allowed it to control the Graphomat Z64 directly and without exchanging the data via punched tape.