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Author Topic: Internal memory expansion (Read 252315 times)

Offline elmer

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Re: Internal memory expansion
« Reply #300 on: 2020.October.05. 19:07:54 »
Quote from: elmer on 2020.September.28. 17:01:35
Sorry, there have been many distractions. I still haven't wired up my video cable, which I need to do before seeing if the memory boards work.

Quick update ... I have finally had the time to solder the video cable, and my Egyptian Enterprise is confirmed to be fully working (just as the seller advertised)!

Now I can open it up and have a go at doing the internal upgrades, and so test if the new memory board design actually works. :)
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Offline Judge

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Re: Internal memory expansion
« Reply #301 on: 2020.October.05. 20:31:46 »
Quote from: elmer on 2020.October.05. 19:07:54
Quick update ... I have finally had the time to solder the video cable, and my Egyptian Enterprise is confirmed to be fully working (just as the seller advertised)!

Then the cable works well.I am very pleased. :smt026
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Offline elmer

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Re: Internal memory expansion
« Reply #302 on: 2020.October.06. 02:11:38 »
Quote from: Judge on 2020.October.05. 20:31:46
Then the cable works well.I am very pleased. :smt026

Yes, thank you!

My terrible job of soldering on the SCART connector end of the cable really doesn't do justice to your clean work on the Enterprise end of the cable! ;)
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Offline Judge

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Re: Internal memory expansion
« Reply #303 on: 2020.October.06. 11:00:17 »
Quote from: elmer on 2020.October.06. 02:11:38
My terrible job of soldering on the SCART connector end of the cable really doesn't do justice to your clean work on the Enterprise end of the cable! ;)

If I knew the scart connector was good for you, I would have soldered it. Sorry! :oops:
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Offline Wolfgang

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Re: Internal memory expansion
« Reply #304 on: 2020.October.09. 14:25:31 »
My pcbs arrived today:
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and everything seems to work okay. :)
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Offline gflorez

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Re: Internal memory expansion
« Reply #305 on: 2020.October.09. 14:56:29 »
Great! the second internal Ram expansion on the same week...

I think that Pear's L-connector solution for the EXP2 header can suit perfectly your project.
« Last Edit: 2020.October.09. 19:43:51 by gflorez »
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Offline elmer

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Re: Internal memory expansion
« Reply #306 on: 2020.October.10. 04:43:14 »
Quote from: Wolfgang on 2020.October.09. 14:25:31
My pcbs arrived today:
and everything seems to work okay. :)

Congratulations! :mrgreen:
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Offline elmer

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Re: Internal memory expansion
« Reply #307 on: 2020.October.10. 05:00:23 »
Quote from: Judge on 2020.October.06. 11:00:17
If I knew the scart connector was good for you, I would have soldered it. Sorry! :oops:

No need to be sorry, if I had known for sure what resistors my Panasonic BT-H1390YN needed, then I would have let you! ;)

I wanted the bare cable so that I could do my own soldering and experiment with different resistor values (if I needed to).

As it was, my 1st attempt worked great ... 330 ohm resistors on R, G, and B, and no resistor on CSYNC.

That will probably work as well for anyone that uses other professional broadcast monitors such as the Sony PVM series.
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Offline Wolfgang

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Re: Internal memory expansion
« Reply #308 on: 2020.October.10. 20:20:17 »
My first 1MB prototype:
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2nd chip not even soldered yet:
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yeah - works! :smt026
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I need to check if I can still put the top on though.....
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Offline gflorez

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Re: Internal memory expansion
« Reply #309 on: 2020.October.10. 20:44:39 »
Great!

I think that the case will fit if you bend a little the EXP2 leads to the left. The eight of the piggy-back Ram chips is the same as the ones on the Saint's Ram expansions I have installed on my EPs, so that will not be a problem.
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Offline Wolfgang

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Re: Internal memory expansion
« Reply #310 on: 2020.October.10. 20:46:15 »
Quote from: gflorez on 2020.October.10. 20:44:39
Great!

I think that the case will fit if you bend a little the EXP2 leads to the left. The eight of the piggy-back Ram chips is the same as the ones on the Saint's Ram expansions I have installed on my EPs, so that will not be a problem.

Yes, works nicely. I don't even have to bend anything. :)
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Offline Wolfgang

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Re: Internal memory expansion
« Reply #311 on: 2020.October.11. 13:54:13 »
And here are the files for anybody who wants to produce the board.
I would be glad to see pictures of produced boards. :)

Stay healthy!


btw.: J1 has the same order as Saints boards - i.e. GND GND A21 A19 A17 +5V GND A20 A18 A16
 
« Last Edit: 2020.October.12. 10:48:43 by Wolfgang »
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Offline gflorez

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Re: Internal memory expansion
« Reply #312 on: 2020.October.11. 18:52:21 »


Yess, it is a wonderful heritage.....
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Offline elmer

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Re: Internal memory expansion
« Reply #313 on: 2020.October.12. 06:28:12 »
Quote from: Wolfgang on 2020.October.10. 20:20:17
My first 1MB prototype:
...
yeah - works! :smt026

Excellent work!

I was worried when I saw the very narrow width of your +5V track, but it looks like it was OK ... congratulations! :)


May I ask ... as another newcomer here, what interests you about having 1MB RAM instead of 512KB RAM?

Have I missed hearing about something fun that needs that much RAM on the Enterprise?
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Offline Wolfgang

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Re: Internal memory expansion
« Reply #314 on: 2020.October.12. 08:55:04 »
Quote from: elmer on 2020.October.12. 06:28:12
Excellent work!

I was worried when I saw the very narrow width of your +5V track, but it looks like it was OK ... congratulations! :)

Yes, I had the same worry but was not able to change it, since I am an absolute beginner with KiCad. 

Quote from: elmer on 2020.October.12. 06:28:12

May I ask ... as another newcomer here, what interests you about having 1MB RAM instead of 512KB RAM?

Have I missed hearing about something fun that needs that much RAM on the Enterprise?
For no sensible reason, just intellectual curiosity. And my GAL has so many unused outputs. :lol:
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