John Smith Legacy John Smith Legacy Gradius Home World Gradius Home World GameStone GameStone JimStoneCraft on X Follow @JimStoneCraft

Zzap World 64 Zzap! World 64 GSRcade GSRcade Media Media


Joystick Prototypes



Metal GSRcade

Wooden GSRcade

Hori GSRcade

Hori GSRcade

Windy GSRcade

Jefcade Supergun

JAMMA Jefcade

Back in 1994 my brother made a small portable JAMMA arcade machine which would later be known as a Jefcade Supergun for desktop use, this again plugged into the great Phillips CM 8833 MkII 14" Monitor.

The extra items my brother added to the joystick were Autofires on all three buttons (much easy playing shoot'em-ups). The Autofire can be switched between three modes.

The three LED's flash with the speed if the Autofire, the three Potentiometer adjust the speed of each Autofire. The 1 Player button also lights up.

About the only problem with the design at the time was that a standard Maplin's project box was the only thing that it could be made from and is a little boxey.

JAMMA Jefcade JAMMA Jefcade Three 555 timers were used to achieve the Autofire for each of the three buttons..

Very neat and tidy, as it uses the 5v rail, it's also protected by a fuse.

The three preset Potentiometer are for setting the 555 timers to the lowest setting in speed without stalling the clock pulse, sort of trim adjustment.

Below is a list of all the components that were used in the circuit (price are quite a bit out of date).

I will try to make a circuit diagram at some point and maybe even update the design, I think if I was making one I would make it for just one buttons and then make three of them, this would make the design a little more modular.

At the time the project was originally made, you could get single 555 and the 556 dual timer, now you can get the 558 quad timer, so the PCB could be simplfied down to just one IC as only three channels are needed.

Maplin Code Description £ Each Quantity £ Total
QH66W NE555N Timer 0.29 3 0.87
BL17T 8 Pin DIL IC Socket 0.14 3 0.42
VJ56L Plastic Fuse Cover 0.19 1 0.19
GJ85G Fuse 315mA QB (Pack of 20) 0.79 1 0.79
KU27E Fuse Clips 20mm with In-Line Pins Type2 0.07 2 0.14
UH02C 4K7 Preset Potentiometer (349M) 0.19 3 0.57
VH02C 0.47uF 63v Capacitor 0.06 3 0.18
VH08J 10uF 50 Capacitor 0.06 3 0.18
M47K 47K Ohm +-1% Resister (Yellow, Violet, Black, Red - Brown) 0.07 3 0.21
M1K8 1.8K Ohm +-1% Resister (Brown, Gray, Black, Brown - Brown) 0.07 3 0.21
M1K6 1.6K Ohm +-1% Resister (Brown, Blue, Black, Brown - Brown) 0.07 3 0.21
WX77J 10000pF Dia 6mm Metallised Ceramic Plate Capacitors (103Z) 0.05 3 0.15
JP52G Strip Board (cut to 31 [W] x 21 [H] Holes (Horizontal Strips)) 3.29 1 3.29
FL24B PCB Solder Pins Type 2145 (100 Pack) 2.99 1 2.99
FL25C Spot Face Cutter (for cutting the Strip Board) 7.49 1 7.49
CK46A Red LED 5V 0.26 3 0.78
JM76H Miniature Potentiometer Lin 1M 0.49 3 1.47
RS Code Description £ Each Quantity £ Total
337-481 Slide Switch, 1A, 100V, 2 pole, 3 Position 1.45 3 4.35
Controls Description £ Each Quantity £ Total
  One Player Button (optional bulb)   1  
  Buttons (choose your own colours)   3  
  Joystick (of your choice)   1  


[T O P]