Didaktik M introduced in 1990, was more advanced in design and reliability. The machine resembled more of a professional home computer with arrow keys separated from the rest of the keyboard and a more ergonomic shape of the case. Inside there was only 64 KB of total memory (16 KB ROM and 48 KB RAM) which was a disappointment in comparison to the Gama. The computer was considerably redesigned. A custom circuit from Russian company Angstrem was used instead of the original ULA as a result the screen had a square aspect ratio instead of a rectangle 4:3. In addition the whole RAM was realized by one set of 64 KB chips from which only 48 KB were used and there was no difference between the fast and slow memory with the video content. There were two separated connectors for joysticks and one connector for additional interfaces, such as a printer interface. Unlike the previous version of Didaktik, these connectors were typical "socialistic solution" compatible with nothing that was then available in the ČSSR. Thus, users were forced to develop and produce various and sometimes funny home-made interfaces to satisfy their needs. Data storing and monitor type was the same as in the case of the Gama.
Two floppy disk drives were developed and released later to offer the possibility of fast saving/loading of various programs.
5.25-inch floppy disk drive called D40 was introduced in 1992 and featured a "Snapshot" (see also Hibernation (computing)) button that allowed to store current content of the memory (memory image) on diskette. It was also possible later to load the memory image and continue playing the game (or whatever was stored) from the respective state.
3.5-inch floppy disk drive called D80 was also introduced later in 1992 at the same time as Didaktik Kompakt was released.
Source: Wikipedia, "Didaktik", available under the CC-BY-SA License.