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ColecoVision 1.2 - replacement PCB, added features

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Just a heads up that the PCB manufacturing for the next prototype has been started. I should have it in hand within a couple of weeks. I'm only working on this when I have time, besides a number of other projects, so progress may be slow at times.

 

Here's a picture of the layout (part of a batch of boards):

post-3127-0-48191300-1385489549_thumb.png

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Wow, that's a lot of components to solder onto the board. :)

There's lots of diodes for the keypad and Sega controllers, and a lot of circuitry for the composite output. In the future, that will likely go on a daughter board.

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Just a heads up that the PCB manufacturing for the next prototype has been started. I should have it in hand within a couple of weeks. I'm only working on this when I have time, besides a number of other projects, so progress may be slow at times.

 

Here's a picture of the layout (part of a batch of boards):

 

any plans to add SGM built in?

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A few pictures...

 

The first prototype from a few years ago. No cartridge slot. One joystick port. DRAM tower (video memory) sort of installed. Was converted to an SG-1000 (but without joystick support):

 

post-3127-0-21012700-1386189628_thumb.png

 

The second prototype from a year or two ago, showing the SRAM daughterboard (video memory) this time. Later I added 24K RAM to test Zaxxon and Dragon's Lair before I had an SGM. Don't ask why the cartridge slot is installed on the bottom ;):

 

post-3127-0-75335000-1386189644_thumb.png

 

The third prototype PCB, unassembled, which should have full ColecoVision compatibility (excluding RF output), but with some extras (5V input, component/YPbPr output, composite output, Sega controller capability, keypad capability). It's still a prototype, so I anticipate a number of changes before the next version (which will hopefully be the beta version):

 

post-3127-0-93239200-1386189671_thumb.png

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A few pictures...The first prototype from a few years ago. No cartridge slot. One joystick port. DRAM tower (video memory) sort of installed. Was converted to an SG-1000 (but without joystick support):attachicon.gifproto1.pngThe second prototype from a year or two ago, showing the SRAM daughterboard (video memory) this time. Later I added 24K RAM to test Zaxxon and Dragon's Lair before I had an SGM. Don't ask why the cartridge slot is installed on the bottom ;):attachicon.gifproto2.pngThe third prototype PCB, unassembled, which should have full ColecoVision compatibility (excluding RF output), but with some extras (5V input, component/YPbPr output, composite output, Sega controller capability, keypad capability). It's still a prototype, so I anticipate a number of changes before the next version (which will hopefully be the beta version):attachicon.gifpcb.png

 

ColecoVision ... Ah...... ColecoVision..... Such an awesome system! :cool:

I must admit we are pretty lucky to have folks like you in the homebrew scene!

 

Cheers to that!

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Just a heads up that the PCB manufacturing for the next prototype has been started. I should have it in hand within a couple of weeks. I'm only working on this when I have time, besides a number of other projects, so progress may be slow at times.

 

Here's a picture of the layout (part of a batch of boards):

Awesome project! Those other boards around the Coleco board look pretty interesting as well.

 

Do you use an autorouter at any point in the design process?

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Do you use an autorouter at any point in the design process?

I actually use FreePCB. It's not the greatest, but it serves me well, at least for simple and/or digital stuff, where most of the work is just connecting address and data lines. I use the included auto-router, then usually do a lot of clean-up afterward. For this prototype, I didn't do any clean-up... I won't do that until I need to make more than one of them.

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Thanks for the kind words, everyone. Just remember that it's all pretty much vapourware until you're able to have one of your own. They did make 2 boards instead of the 1 I requested, so who knows, if it works well, maybe one will be up for grabs sometime. Please don't PM me, though... .

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A few pictures...

 

The first prototype from a few years ago. No cartridge slot. One joystick port. DRAM tower (video memory) sort of installed. Was converted to an SG-1000 (but without joystick support):

 

attachicon.gifproto1.png

 

The second prototype from a year or two ago, showing the SRAM daughterboard (video memory) this time. Later I added 24K RAM to test Zaxxon and Dragon's Lair before I had an SGM. Don't ask why the cartridge slot is installed on the bottom ;):

 

attachicon.gifproto2.png

 

The third prototype PCB, unassembled, which should have full ColecoVision compatibility (excluding RF output), but with some extras (5V input, component/YPbPr output, composite output, Sega controller capability, keypad capability). It's still a prototype, so I anticipate a number of changes before the next version (which will hopefully be the beta version):

 

attachicon.gifpcb.png

 

I'm impressed!

 

I dream of a full new CV not just mother board! :)

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A few pictures...

 

The first prototype from a few years ago. No cartridge slot. One joystick port. DRAM tower (video memory) sort of installed. Was converted to an SG-1000 (but without joystick support):

 

attachicon.gifproto1.png

 

The second prototype from a year or two ago, showing the SRAM daughterboard (video memory) this time. Later I added 24K RAM to test Zaxxon and Dragon's Lair before I had an SGM. Don't ask why the cartridge slot is installed on the bottom ;):

 

attachicon.gifproto2.png

 

The third prototype PCB, unassembled, which should have full ColecoVision compatibility (excluding RF output), but with some extras (5V input, component/YPbPr output, composite output, Sega controller capability, keypad capability). It's still a prototype, so I anticipate a number of changes before the next version (which will hopefully be the beta version):

 

attachicon.gifpcb.png

 

ColecoVision 1.2 - So beautiful...

 

:)

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Looks like some good progress. Still a lot of work to populate those boards though.

 

Any cartridges that are compatible with the Coleco Adam should be fine with the 24k of RAM. There are a couple -- like Telegames US released a soccer game that worked on the CV and not on the Adam as I recall.

 

I usually use Eagle from cadsoft for work. It works pretty well, but you have to pay big bucks if you want to make a PCB that large I guess. It is cheap/free for smaller projects though.

 

I haven't tried FreePCB in a while, maybe I'll have to check it out again.

Edited by hardhat

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