Improvement of the SEGA joystick. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Телевидение
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The joysticks of the Sega video game console have an extremely rarely required "MODE" button in games. Two non-standard options for its use are proposed.
In the first, the so-called "flashing" LED is used. If you connect it as shown in Fig. 1, between the contacts of the "START" and "MODE" buttons not connected to a common wire, then when the latter is pressed, the LED and the internal resistor of the joystick chip form a pulse generator with a repetition rate of approximately 2 Hz. This simulates repeatedly pressing the "START" button, which in the vast majority of game programs will slow down the pace of events on the screen. LED HL1 can be any color of glow with a housing diameter of 3...5 mm. It should be borne in mind that the current flowing through it in this case (about 0,1 mA) is insufficient for visual observation of light flashes.
In arcade games with a dynamic change of plots, a joystick modified according to the scheme shown in fig. 2. The "MODE" button in this case simulates the simultaneous pressing of the "A" and "C" buttons. If necessary, you can "enable" other combinations, for example, "X" and "Z", "A" and "B". Diodes VD1, VD2 - any low-power silicon or germanium.
Additional parts are placed in any convenient place inside the joystick body and connected with thin insulated wires to the printed conductors of its board. Of the two joysticks included in the set-top box, it is advisable to modify only one, and use the second in games where the "MODE" button should work for its intended purpose.
Author: S.Ryumik
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