Acorn Atom Replica build

[rubber_jonnie]

Interesting, I wonder if the green is only from the modulator then? So A bit like the Beeb & Electron that need mods to get colour out of composite. That would make sense.

Sense has nothing to do with it... The Motorola engineers baked it into the chip design.

[rubber_jonnie]

So, I have confirmation from over at StarDOT that monochrome over NTSC is indeed correct for the Atom as standard.

I think having seen all the green screen images and used Atomulator, I was assuming green, especially since the Dragon uses the same 6847, and the Dragon uses green aplenty in it's palette

[rubber_jonnie]

I have to say the Atom is running very nicely indeed, quite an interesting build.

I would definitely say it's an interesting and fun build and there are some great upgrades, the Yarrb and AtoMMC in particular are excellent.

@PhilC did you get either of those for your real machine and how did they run if you did?

[PhilC]

I have to say the Atom is running very nicely indeed, quite an interesting build.

I would definitely say it's an interesting and fun build and there are some great upgrades, the Yarrb and AtoMMC in particular are excellent.

@PhilC did you get either of those for your real machine and how did they run if you did?

Yes I have a Yaarb, Atommc and a noisekiller for my old Atom. I think that lot cost me more than buying the Atom did

[rubber_jonnie]

I have to say the Atom is running very nicely indeed, quite an interesting build.

I would definitely say it's an interesting and fun build and there are some great upgrades, the Yarrb and AtoMMC in particular are excellent.

@PhilC did you get either of those for your real machine and how did they run if you did?

Yes I have a Yaarb, Atommc and a noisekiller for my old Atom. I think that lot cost me more than buying the Atom did

I don't have a noisekiller yet but may well build the RGB2HDMI board you sent and I do have a colour board on order.

Yarrb and AtoMMC are just great I have to say.

[PhilC]

@rubber_jonnie you'll not need the colour board if you build the rgb2hdmi as it plugs into the same set of header pins

[rubber_jonnie]

@rubber_jonnie you'll not need the colour board if you build the rgb2hdmi as it plugs into the same set of header pins

I got it as a back up as the RGB2HDMI board may take a while to build...

Colour board will be faster. and will do until the RGB2HDMI is done.

[rubber_jonnie]

OK, so the colour board is mostly built:

IMG20260406150028.jpg (288.44 KiB) Viewed 462 times

I'm just waiting on the3 IC's and some caps then I can give it a go. I'll report back when I'm done

I may also in the meantime start building the through hole parts of the RGB2HDMI board with the parts I have, but since I'm back to work tomorrow I may have to slow down again.

[alexh]

Nice

[rubber_jonnie]

A little more done, IC 3 & IC4 fitted:

IMG20260409075127.jpg (188.59 KiB) Viewed 430 times

Annoyingly IC1 and IC3 are the same and I only managed to order one of them...

Another one is on the way but I'm waiting for IC2 to come from Ali Express so it could be another week.

Hey ho...