high speed readout for elekterminal

9-28 — elektor september 1980 high speed readout for elekterminal With a minor modification to the Elekterminal it is possible to "store" the entire contents of the display (TV screen) on a cassette tape. The majority of the connections can be wired to the existing expansion sockets. For the remaining connections just three of the copper tracks between the UART and the CRTC on the main board of the Elekterminal have to be broken. When the start button, S1 of figure 1, is depressed, the Q output of FF1 goes low. As the Q output of FF1 is high, the memory WRITE signal is inhibited by N4. When one of the keys on the ASCII keyboard is depressed, preferably the space key or a control key, a strobe pulse (KS) will be generated. The leading edge of the strobe pulse will cause the data from the keyboard to be entered into the UART in parallel. With switch S1 in figure 2 closed, this information will be passed out of the transmitter section of the UART and back into the receiver section ...