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Author Topic: Internal memory expansion (Read 51648 times)

Offline Saint

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Re: Internal memory expansion
« Reply #60 on: 2013.October.17. 23:16:47 »
I think can be done less than 5 minutes :-)
I will ask in the Hungarian forum, how many users interested.

You are much better than me with a solder sucker if you can do this in under 5 minutes! :lol:

Thanks, Zozo, happy to make up some more. It's nice to think I'm helping keep the Enterprise alive! :)

Offline Zozosoft

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Re: Internal memory expansion
« Reply #61 on: 2013.October.17. 23:19:48 »
Quote from: Saint
You are much better than me with a solder sucker if you can do this in under 5 minutes! :lol:
Complete Z80 replace less than 10 minutes :-D

Offline fatbob_gb

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Re: Internal memory expansion
« Reply #62 on: 2013.October.17. 23:31:06 »
Quote from: Saint
It's nice to think I'm helping keep the Enterprise alive! :)
Thanks for the effort that you are putting in - It is appreciated.
My Enterprise is possibly the most neglected machine that I own but soon it will be getting the attention that it deserves.

Offline Bagpuss22

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Re: Internal memory expansion
« Reply #63 on: 2013.October.17. 23:38:15 »
I second that, thank you for this and I look forward to the other bits and pieces
that you are looking at producing!

:smt023

Offline Starship

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Re: Internal memory expansion
« Reply #64 on: 2013.October.18. 09:22:33 »
Please can you let me know when you will have the combined Memory Expansion and SD card interface ready for purchase....you have one buyer here!


Starship

Offline Zozosoft

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Re: Internal memory expansion
« Reply #65 on: 2013.October.18. 09:53:17 »
Current summary for Hungary: 6! (Zozo, Szalai56, Z80System, Lacika)
For reducing the shipping cost, I will do the business with you, then forward for my friends in Hungary.

Can you calculate the shipping cost with Royal Mail International Signed For service?

Offline Saint

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Re: Internal memory expansion
« Reply #66 on: 2013.October.18. 10:44:41 »
Quote from: Zozosoft
Can you calculate the shipping cost with Royal Mail International Signed For service?
No problem, Zozo, I'll sort that out for you. I'm going to figure out postage costs this evening. With the new orders from Hungary that's the whole 10 units gone! I'll order some more PCB's... :)

Quote from: Starship
Please can you let me know when you will have the combined Memory Expansion and SD card interface ready for purchase....you have one buyer here!


Will do! The SD card interface will be some time away yet as I've only got as far as the planning stage. However it's the most important thing that is needed on the Enterprise, so I want to make it happen.

Offline Saint

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Re: Internal memory expansion
« Reply #67 on: 2013.October.18. 22:57:05 »
Just a quick update on postage costs for a single unit if anyone else is interested --

UK
Royal Mail first class, £3.00
Royal Mail signed for, £4.10

Airmail
Airmail Small Packets, £3.00
International Signed For Small Packets, £8.30

I'm just going to double check the two boards going out with the latest 2.4 memory checker, then they will be shipped out once payment is made.

I'm waiting on some more right angled headers which should turn up tomorrow, then I think I have everything to make up the rest of the boards. Hopefully will have all 10 built up next week. Going to place an order for another 10 PCB's now... :)

Update -- all boards tested perfectly with advanced test, new batch of 10 PCB's ordered!
« Last Edit: 2013.October.18. 23:44:18 by Saint »

Offline Bagpuss22

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Re: Internal memory expansion
« Reply #68 on: 2013.October.19. 00:26:54 »
Looking forward to doing this, quite excited! :smt023

Just got to get this 16K Spectrum sorted over the weekend and then I am ready!

Offline Zozosoft

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Re: Internal memory expansion
« Reply #69 on: 2013.October.19. 00:33:19 »
Quote from: Saint
all boards tested perfectly with advanced test
Great!

Offline geo1977

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Re: Internal memory expansion
« Reply #70 on: 2013.October.19. 02:55:51 »
We are OK!!!!!!!!!!!!! i wating my memory working with my enterprise:lol::smt039

Offline Zozosoft

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Re: Internal memory expansion
« Reply #71 on: 2013.October.19. 17:38:11 »
Quote from: Saint
new batch of 10 PCB's ordered!
When do you think the second batch available?

Current orders from Hungary: 8!
« Last Edit: 2013.October.19. 19:00:37 by szipucsu »

Offline Saint

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Re: Internal memory expansion
« Reply #72 on: 2013.October.19. 21:18:51 »
When do you think the second batch available?

Current orders from Hungary: 8!

Great! :) I also saw in the Hungarian thread people talking about memory expansions larger than 512KB. Is this something that people would want? I may be able to get some larger SRAM if there is interest, although it all takes time to get the PCB made, etc.

The lead time on the PCB's is around 3 weeks. Plus I have ordered some more GAL's, which are the slowest thing to arrive. The last lot took 40 days!! I ordered them about 7 days ago, so I have a feeling I am going to be waiting for the GAL's to arrive again... :(

Offline lgb

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Re: Internal memory expansion
« Reply #73 on: 2013.October.19. 22:11:29 »
Quote from: Saint
The lead time on the PCB's is around 3 weeks. Plus I have ordered some more GAL's, which are the slowest thing to arrive. The last lot took 40 days!! I ordered them about 7 days ago, so I have a feeling I am going to be waiting for the GAL's to arrive again... :(

Btw, what's about GALs in general? It seems it's harder and harder to get, since GALs are treated as "old technology", everybody suggests use CPLDs instead, but there are few ones which are 5V ones (or at least 5V tolerant I/O) and DIP packaged ... Also sometimes CPLDs feel a bit "too much" for simplier projects ...

Offline Z80System

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Re: Internal memory expansion
« Reply #74 on: 2013.October.19. 22:38:16 »
Quote
Great!  I also saw in the Hungarian thread people talking about memory expansions larger than 512KB. Is this something that people would want? I may be able to get some larger SRAM if there is interest, although it all takes time to get the PCB made, etc.

Hi Saint,

For example, I asked Zozo, why you stopped at 512KB and you did not target 1MB or 2MB ...

I think this internal 512KB expansion is very very cool, probably the coolest hw enhancement since Zozo's IDE controller with what we can use SD cards, already now.

So what can be more cool than this internal 512KB expansion is a 1MB or 2MB internal expansion ... :)

In practice usually we do not use even 512KB memory. Probably that is a hard task to find any application that can use this amount of memory. But the practice is rarely important for me (and probably others) using an EP.

Probably the testing time at boot, and the price can be important too, but the bigger can be better for me. If there is no other disadvantages at the larger expansions. Maybe EXOS cannot handle 2MB of ram, or something like this. Zozo usually knows such things.

Maybe that can be a concern too, that I can wait nearly any time, but maybe that is better, the whole packet not wait for some extra size rams or such, for the other people.

So yes, I would welcome one of my expansions with for example 1 or 2 MB, which can work, but it is not a reqirement at this time.

And an other user thought about his machine, which is a 1MB expanded one, and he asked Zozo whether your expansion will work with that configuration or not. But Zozo said "Some more RAM cannot be wrong ..." :)
Z80 System