145 lines
5.5 KiB
Plaintext
145 lines
5.5 KiB
Plaintext
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From nhowland@centurion.ksu.ksu.edu Tue Mar 2 09:10 EST 1993
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Received: from centurion.ksu.ksu.edu by starbase.spd.louisville.edu with SMTP
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(1.37.187.4/16.2) id AA29371; Tue, 2 Mar 93 09:10:51 -0500
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Return-Path: <nhowland@centurion.ksu.ksu.edu>
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Received: by centurion.ksu.ksu.edu (4.1/1.34)
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id AA13675; Tue, 2 Mar 93 08:10:28 CST
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Date: Tue, 2 Mar 93 08:10:28 CST
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From: nhowland@centurion.ksu.ksu.edu (Neal Patrick Howland)
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Message-Id: <9303021410.AA13675@centurion.ksu.ksu.edu>
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To: sysrick@starbase.spd.louisville.edu
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Subject: Genesis joystick pinouts
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Status: RO
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Yes folks! It is the much requested Gensis joystick pinout information!!!
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<much applause>
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First some background info: The chip inside the controller is a 74HC157. This
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is a high-speed cmos quad 2-line to 1-line multiplexer. Basically how this
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works is there are two inputs ( A and B ) for every output ( Y ). There are
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four groups like this. There is one select signal for the whole chip. When
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the select signal is low, the output ( Y ) is the same as input A. When the
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select signal is high, the output Y is the same as input B. The pinout for
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the chip is as follows:
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Pin 1 - Select Pin 16 - Vcc (+5V)
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Pin 2 - 1A Pin 15 - G (? must be low)
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Pin 3 - 1B Pin 14 - 4A
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Pin 4 - 1Y Pin 13 - 4B
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Pin 5 - 2A Pin 12 - 4Y
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Pin 6 - 2B Pin 11 - 3A
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Pin 7 - 2Y Pin 10 - 3B
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Pin 8 - Gnd Pin 9 - 3Y
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All the controls are done with switches. Up is a switch, Down is a switch,
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etc. Now, I will be refering to the output of these switches later on. What
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I mean is that the output is usually high, that is when the switch isn't pressed.
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When the button is pushed, the output goes low. This is accomplished by
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connecting the output to +5V through a 10k resistor. The button is then
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attached between the output and ground. It looks like this:
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+5V -----/\/\/------+--------- Output
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10k |
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/ |
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Ground -----/ -------+
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button
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(normally open)
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For all of those who could actually decipher the above schematic, congratulations!
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I will now run down what lines from the plug are connected to what.
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The line numbers are determined as follows, looking straight at the plug on
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the front of the Genesis the numbers are:
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1 2 3 4 5
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6 7 8 9
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(For those of you who buy a joystick cable from radio shack the pin #'s to
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wire colors are as follows: 1-black 2-brown 3-red 4-orange 5-get cup from bag
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sorry about that, lets start again 1-white 2-blue 3-green 4-brown 5-yellow
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6-orange 7-red 8-black 9-gray, )
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anyway, line connections:
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Line 1 - Up output
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Line 2 - Down output These are the only two direct connections
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Line 3 - Pin 4 of the chip output 1Y
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Line 4 - Pin 7 of the chip ouput 2Y
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Line 5 - This line carries in +5V. It is connected to the +5V bus line.
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Line 6 - Pin 9 of the chip output 3Y
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line 7 - Pin 1 of the chip this carries in a select signal from the Genesis.
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This is a signal which varies rapidly and controls
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which input goes through the ouput
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Line 8 - Ground This is connected to the Ground bus line.
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Line 9 - Pin 12 of the chip output 4Y
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Now for the chips pin connections:
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Pin 1 - Line 7 (select)
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Pin 2 - Ground (1A) don't ask me why they do this. Maybe future expansion
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Pin 3 - Left (1B)
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Pin 4 - Line 3 (1Y)
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Pin 5 - Ground (2A) again, possibly future expansion
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Pin 6 - Right (2B)
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Pin 7 - Line 4 (2Y)
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Pin 8 - Ground (GND)
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Pin 9 - Line 6 (3Y)
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Pin 10 - Button B (3B)
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Pin 11 - Button A (3A)
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Pin 12 - Line 9 (4Y)
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Pin 13 - Button C (4B)
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Pin 14 - Start (4A)
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Pin 15 - Ground (G) This must be connected to ground
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Pin 16 - +5V (Vcc) Power source for the chip
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Anyway thats all the info needed to build your own joystick.
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Now as an added bonus, additional indormation!
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A simple source for a joystick cable is the Radio Shack joystick extension
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cable. It is around $5 and is 10 ft. long. Just snip off the connector that
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won't plug into the Genesis, strip the wires back, and use the color pinout
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list I gave above.
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I went to my local arcade game repair company today and purchased the supplies
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I needed. They were much cheaper than I expected. Things you would need to
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buy from them would be:
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an 8-way joystick this ran me $15
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3 buttons $2.50 apeice
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I only bought three buttons because I am going to use a Radio Shack push button
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switch for my sart button. You can purchase 4 arcade game buttons if you wish.
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Interesting ideas for extras on the joystick:
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1. Autofire can be acheived with a simple 555 timer circuit.
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For anyone wanting a challenge it should be possible to build a
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digital autofire using a divide-by-n counter with the select signal
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as clock input.
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2. Slow down mode is just autofire for the start button.
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For anyone looking for an easy way out, buy a cheap joystick or pad with the
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features you want, tear into the pad and steal the circuit board and the cable.
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The complicated part will be attaching wires between the new joystick and
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buttons and the correct spot on the circuit board. This method may even be
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cheaper than buying electronics parts and building from scratch depending on
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how expensive the control pad that you buy is.
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Anyway, that should be enough to at least get you guys started. Let the net
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know how these homebuilt joysticks are performing. I hope to have mine working
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within a couple weeks.
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Neal Howland
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nhowland@matt.ksu.ksu.edu
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