Brad's Electronic projects

Video game console mods

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These are various mods I have come up with over the years for classic video game consoles.
The circuit has been assembled into an enclosure.  It is powered from the 5200 console and has two jacks to plug in one regular controller and one 5200 controller.  The DB-9 jack accepts an Atari 7800 joystick or a Colecovision controller.  For games that only require one fire button, a regular 2600 joystick can be used.  Games that require true analog movement (like Missle Command and Super Breakout) will not work with the digital adapter.

case.jpg

original version

I have updated the digital controller adapter to fix problems with some games.

update
I developed a controller adapter that can use a PC joystick, either analog or not.  With an analog type, all games are supported.  With a non-analog type, it works as well as the digital controller adapter.  I found that the 5200 keypads get worn out as well, so I added a keypad on the case of one controller.

case.jpg

click here to download all project files


parts used: H11F1 7660
Here is an A/V mod for an Atari 7800. This plugs right into the expansion port of the 7800 console on those that have one.
inside

finished7800
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Parts used: THS7314 LMV321
I like to add A/V outputs to my classic gaming systems.  The outputs of the ColecoVision's TMS9928 video chip are Y, R-Y, B-Y format.  Because of this, it was easier to add component output than a simpler type like composite, or S-video.

inside_coleco

id3_files/pic5.jpg

click here to download all project files

parts used: NJM2267 NJM2268

This is an addon for the Coleco that turns it into a computer that is compatible with the Timex/Sinclair BASIC language.
cts1k

top_of_circuit

graphs
maze
click here to download all project files

parts used: Z08410 Z80 DMA

Copyright 2018, by Brad O'Dell