Still need -5v after ram mod on Colecovision / Adam?

[zippiz]

Hi

 

Hope my first post here don't turn out to be a really stupid one.

I have a Colecovision and Adam on its way, first time owner.

 

But, at least teh ColecoVision is damaged, and my guess is its the ram. I wont get any power supply with either of them.

 

Well, so here is my question. Will the ColecoVision still need -5v after doing the ram-mod? Been trying hard to find this out reading in this forum but still not sure if the controller chip still needs the -5v?

 

If not, I thinking about just using a simple hdd power supply for the ColecoVision. (dont know how to power the Adam computer yet, it should work so maybe try and find a old AT-power suppply or try using a 7905 to generate a -5v.

 

 

So would this work a power supply after a ram mod?

 

http://www.ebay.com/itm/12V-5V-AC-Adapter-Hard-Disk-Power-Supply-For-Hard-Disk-Drive-Black-T1K-/380647145774?pt=Laptop_Adapters_Chargers&hash=item58a056812e

[towmater]

No, I just use a small +5v 2A wall wart to power the CV after the mod. All went well until I added the No-delay bios, now it flickers so I wonder if 2000ma was not quite enough juice. You don't need the 12V either, I think that leaves you without RF tv out, you should put an f18a in whilst you are already operating so that RF won't matter, imho.

Edited January 11, 2015 by towmater

[ApolloBoy]

I believe you'll lose compatibility with the roller controller but I don't know for sure. As towmater said, if you lose the 12V rail you also lose RF (since most of the video circuitry uses 12V). I modded my CV for component video so that's a non-issue for me now, and if you replace the VDP with an F18a there's no worries there either.

[zippiz]

Thanks, so would the Adam also work fine with just 5v since it already offers composite out or maybe the "computer unit" of it requires the 12v and -5 as well?

 

Will consider doing a composite mod as well, need to buy a kit for that I guess, not as easy as the Atari AV mod.