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Atom mods pt 3

Posted: Sun Jul 24, 2011 11:09 pm
by Prime
Ok, after speking to Charlie and Kees at InDa80s, I decided to re-design the Atom RAM-ROM board for a couple of reasons.

1) The original design with everything hanging to the left of the CPU could be unstable in some boards unless a turned pin CPU socket was fitted.

2) This design also ovehangs the space that some people have used to mount a eurocard sized board on PL7, whilst this didn't matter to me, it may to some.

SO the board has been re-designed to move the memory chips to the right of the CPU and the CPLD to the left, this is more stable (as it's more symetrical), and doesn't interfere with the PL7 space.

I've also added the clock "doubler" / video noise killer to the circuit so that the atom can optionally run at 1.7Mhz, this is derived from the video clock in such a way that writes to the video ram do not cause screen disturbance.

Anyway a quick picture :
IMG_2508-cropped.JPG
Atom RAM-ROM / noisekiller v 1.5.
IMG_2508-cropped.JPG (442.87 KiB) Viewed 1131 times
I need to make another ersion of this to check the final component placements as I have shifted things slightly (especially the speed switch), but asuming that works ok, I'll be making another run of ram-rom boards using this design.

Cheers.

Phill.

Re: Atom mods pt 3

Posted: Mon Jul 25, 2011 11:16 am
by oss003
Good work Phill =D> , now there's room to fit in Charlie's AtomSID board :lol:

Kees

Re: Atom mods pt 3

Posted: Mon Jul 25, 2011 11:28 am
by ukretrogamer
Why? Can't the AtomMMC be fitted together with Phill's old revision board?

I bought one of each of Charlie and Phill's boards but haven't tried fitting either yet.

Will I have problems trying to fit them both?

Re: Atom mods pt 3

Posted: Mon Jul 25, 2011 12:51 pm
by Prime
ukretrogamer wrote:Why? Can't the AtomMMC be fitted together with Phill's old revision board?

I bought one of each of Charlie and Phill's boards but haven't tried fitting either yet.

Will I have problems trying to fit them both?
Nope you shouldn't have any probs at all. AtoMMC fits on PL8 by a cable this is on the same side as the keys. Both the RAM-ROM and the Colour board fit on the bottom of the board.

The issue is that if you want to use a board on PL7 the old RAM-ROM board overlaps.

Cheers.

Phill.

Re: Atom mods pt 3

Posted: Mon Jul 25, 2011 2:19 pm
by oss003
I think there's a misunderstanding.
I was talking about Charlie's AtomSID board and not Charlie's AtoMMC board.
The AtoMMC board does not make sound!! :)

Kees

Re: Atom mods pt 3

Posted: Wed Sep 07, 2011 6:55 am
by Lusciousthelock
Hiya, are these colour boards and the rom/ram board for sale? I desperately need something to bring some stability to my atom! Its all piggy backed chips and dodgy solder lol #-o

Re: Atom mods pt 3

Posted: Wed Sep 07, 2011 12:18 pm
by PhilYoung
Lusciousthelock wrote:Hiya, are these colour boards and the rom/ram board for sale? I desperately need something to bring some stability to my atom! Its all piggy backed chips and dodgy solder lol #-o
I'd be interested in some details as well. My 32K and 8K memory boards are done on veroboard and there is a danger of frightening horses...

Cheers,

Phil Young

Re: Atom mods pt 3

Posted: Wed Sep 07, 2011 12:24 pm
by Prime
The new RAM-ROM is pretty much ready to go, though I'll have to check my bank ballance first as I have to pay production costs up front, and am getting the BeebSID boards done in the near future too.

The Video boards will get another run thought Kees is currently looking at the board to see if we can optimise the colour encoding as it's not quite correct.

Cheers.

Phill.

Re: Atom mods pt 3

Posted: Thu Sep 08, 2011 9:11 am
by Lusciousthelock
Well if your taking pre-orders let me know :D