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Author Topic: Internal memory expansion (Read 177281 times)

Offline kokkiklhs

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Re: Internal memory expansion
« Reply #345 on: 2021.March.03. 11:28:46 »
Thank you, Elmer!
This is really fantastic!!!

Offline Fcastellanos

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Re: Internal memory expansion
« Reply #346 on: 2021.September.21. 16:21:47 »
I only have one 512KB memory expansion board available if anyone wants it! ;-)

Here are my memory board design files for EasyEDA, together with the Gerber files and production order files for anyone that wants to get another batch of boards manufactured at JLCPCB.

I have also included the final "Production" files that I got back from JLCPCB, which have the "Tooling Holes" that JLCPCB added so that they could manufacture the boards.

The only strange thing in the process was that I had to edit the "PickAndPlace" file to rotate the SRAM chip 90 degrees, because EasyEDA had output the file with the wrong orientation.  This was only visible when I uploaded the files to their website, and then looked at rendering of the board before finally confirming the order.

Hello,

I'm new at the forum, and I don't know were to present myself to forum fellows.

I've recently purchased an Enterprise 64 and I've seen your message saying that you still have one RAM memory expansion for sale.

Can I buy it from you?

Thanks!

Francesc

Offline port-retro

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Thanks Elmer ...
« Reply #347 on: 2021.October.30. 06:03:11 »
Here are my memory board design files for EasyEDA, together with the Gerber files and production order files for anyone that wants to get another batch of boards manufactured at JLCPCB.

Thank you kind sir.  Havin' a go ...

(just short of double-row headers at the moment)

/brett

Offline Quickie

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Re: Internal memory expansion
« Reply #348 on: 2022.June.05. 22:43:58 »
Hi,

Just wanted to express my gratitude to Elmer.
I was able to build and test with success his 1.5Mb internal ram expansion.

Btw it proved to work like a charm :)


Offline BitHajlito

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Re: Internal memory expansion
« Reply #349 on: 2022.August.12. 22:58:21 »
Helló Mindenki

An other new instance for Elmer's plan. Just after the first Power On. There was two reason to rebuild this nice memory extension. Tell the truth, previously I had an 1 MB card from Sebastian Kotek and it works fine, without problems.
First of all I need a second memory card for my second Enterprise. The other goal is to learn, how to soldering Surface Mounted Devices. I know the Enterprise hw, Z80 Assembly and memory mapping and I had knowledges in "traditional" 1/10 inc, hole mounted TTL electronics, but I always tried to avoid the SMD in my hobby projects.

The main steps in short:

1. download the ep64-1536kb-sram-board.zip from this topic
2. Start the online EasyEda
3. Generate a blank project and inport the sch and pcb files from the zip.
4. Click to Order PCB.
(I ordered the IC-s and capacitors separated from the PCB.)
5. The pcb arrived in 10 days or less.
6. I visited my collegaue and asked, I want to watch the mount process.
He was very helpfull and I think I able to proceed similar actions in the future.
7. The mainboard of the Enterprise was ready to receive the memory board because of the previous memory extension. I had to reorganize the adress and power wires in a new 10 pole connector case only.

I am going to test the new extension on the next days.

Thanks to Elmer for the free design and Endre for the soldering lesson.