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Author Topic: Internal memory expansion (Read 51170 times)

Offline Bagpuss22

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Re: Internal memory expansion
« Reply #30 on: 2013.September.13. 22:57:22 »
Looks really good and a very good price too!  :cool:

Offline Zozosoft

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Re: Internal memory expansion
« Reply #31 on: 2013.September.13. 23:08:49 »
Which program used for the PCB design?

Offline Saint

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Re: Internal memory expansion
« Reply #32 on: 2013.September.13. 23:20:39 »
I've been using Altium Designer, it's very nice. I find it much easier than Eagle, which I used before. The 3d view of the board (the mockup shot from earlier in the thread) is really nice too.

Offline Saint

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Re: Internal memory expansion
« Reply #33 on: 2013.September.14. 17:53:02 »
I just got my PCB's back from my HDMI project, they are VERY nice! And arrived much quicker that I expected -- I think it took about 2 weeks from placing the order. I've attached a scan, so if anyone else is thinking of using them you can see what you get!

And this board had a load of channels cut as well for detaching multiple PCB's from the one main board.

Excellent!! :D

Offline Zozosoft

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Re: Internal memory expansion
« Reply #34 on: 2013.September.14. 20:37:18 »
It looks very good!
« Last Edit: 2013.September.15. 21:46:23 by szipucsu »

Offline Saint

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Re: Internal memory expansion
« Reply #35 on: 2013.September.14. 23:57:24 »
I like designing with surface mount components, but trying to solder these 0.5mm pitch chips by hand is a bloody nightmare! I don't think I have the knack yet. More practice needed. Still, I have one chip soldered after about an hour!! :o

I'm glad I went 'old school' and used all through hole components for the EP memory expansion. :D

Offline Zozosoft

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Re: Internal memory expansion
« Reply #36 on: 2013.September.15. 00:21:48 »
Quote from: Saint
I'm glad I went 'old school' and used all through hole components for the EP memory expansion. :D
Good idea!

Offline Saint

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Re: Internal memory expansion
« Reply #37 on: 2013.October.10. 14:07:26 »
My PCB's arrived today! Looking good.

I'm just missing the GAL's to be able to assemble the board entirely. I'll probably get an expensive GAL locally until I can get some cheaper from China to make the rest of the boards up.

Offline Zozosoft

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Re: Internal memory expansion
« Reply #38 on: 2013.October.10. 14:48:01 »
Quote from: Saint
My PCB's arrived today! Looking good.
Nice!

Offline BruceTanner

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Re: Internal memory expansion
« Reply #39 on: 2013.October.10. 14:51:05 »
Quote from: Saint
My PCB's arrived today! Looking good.
Two tracks between pads - you'd never do that by hand!

Offline Saint

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Re: Internal memory expansion
« Reply #40 on: 2013.October.10. 22:33:14 »
The first PCB built up! I've ordered a GAL from the UK, which I should get in the next couple of days. All going well I should have a working 512KB expansion in a few days.

I've built the memory expansion to be removable (all on header pins) such that I can fully test each new unit I make, and also have the ability to make other internal cards and easily install them if needed. My internal SD card hard drive and combined memory expansion being one I want to make... :)

Offline Mayer Gábor

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Re: Internal memory expansion
« Reply #41 on: 2013.October.11. 00:04:43 »
Could you please show me a photo of your motherboard with these pins?

Offline Saint

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Re: Internal memory expansion
« Reply #42 on: 2013.October.11. 10:34:53 »
I will take a photo of the motherboard later on today. I've fitted a header socket into EXP1 and a ribbon with 10way connector into EXP2 (all of which will be provided with the memory upgrade kit).

I've priced up the finished kit, and assuming I get my GAL chips from China eventually, then I can sell them at £15 + P&P. A bargain knock-down price for Enterprise Forever users! I'll put some on eBay at a higher price and see if I can make a few more pounds to fund the SD card interface work.

This is assuming it works of course! Lol. :lol:

Offline Saint

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Re: Internal memory expansion
« Reply #43 on: 2013.October.11. 15:10:25 »
This is the motherboard.


Offline Zozosoft

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Re: Internal memory expansion
« Reply #44 on: 2013.October.11. 15:51:16 »
Quote from: Saint
This is the motherboard.
Nice!