AUTOFIRE in the computer manipulator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Computers
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Most of the games for the computer "Quorum-64" are programmed according to the principle; one press of the "Fire" button of the manipulator - one shot. But the result will be achieved faster if you "shoot" bursts. To do this, you will have to repeatedly press the button, which distracts from observing the events taking place on the screen and tires the player. I propose to modify the manipulator by introducing the "Autofire" mode of automatic fire into it. The refinement allows you to change the rate of fire, and each "shot" is signaled by a blinking LED. An additional lithium source is not required. The required voltage is removed from the contacts of the buttons of the manipulator.
The polarity of the voltage on the buttons may be different depending on the type of joystick connector installed in the computer. In the SINCLAIR connector, the common wire of all buttons is connected to the negative, and in the KEMPSTON connector to the positive pole of the 5 V power supply. Therefore, two options for improvement are offered. Their circuits (Fig. 1 and 2) differ only in the polarity of the diodes and the structure of the transistor.
The buttons SB1-SB5 and the fork XP1 are the nodes of the manipulator being finalized. A pulse generator is assembled on the DD1 chip. Inputs 12 and 13 of its unused element must be connected to one of the power outputs (7 or 14). The voltage in the power circuit comes from the open contacts of the buttons SB 1-SB4 through the diodes VD1-VD4. For the generator to work, it is enough that at any time at least one of the buttons remains unpressed. The emitter-collector section of the transistor VT1 is connected in parallel to the SB5 button. When the SA1 switch is closed, the generator pulses periodically open the transistor, simulating a button press. Simultaneously with the opening of the transistor, the HL1 LED lights up. signaling a "shot". The pulse repetition rate, which determines the rate of "shooting", is regulated by a variable resistor R2. By selecting the value of R1, you can change the adjustment limits.
Instead of the K561LA7 microcircuit, the K561LE5 is suitable without changing the circuit. Diodes VD1-VD4 and transistor VT1 - any low-power silicon. Naturally, when replacing a transistor, its structure should be taken into account. If there are several LEDs of the same or different types, install the one in the manipulator. which glows brighter. It is not recommended to reduce the resistance of the resistor R3 to increase the brightness. When the LED is lit, the allowable current in the circuits of the SB1-SB4 buttons will be exceeded (0.34 mA - for SINCLAIR. 3.5 mA - for KEMPSTON). the computer will fix their circuit and the game will become impossible. In extreme cases, the LED can be abandoned.
Author: V. Loboda, Pervouralsk
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