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Author Topic: What internal RAM expansion? (Read 2624 times)

Offline Allf

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Re: What internal RAM expansion?
« Reply #15 on: 2020.August.21. 07:53:47 »
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How did that work out for you?

I just ordered the PCB from China.The goal was to reduce power consumption (the supply circuit heating).
Since the Germans mounted the machines with the circuit so it can be said to be original.

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Did you solder the cable directly to your expansion PCB, or did you use some kind of 2x5 IDC connector?


The circuit will replace the old RAM using the original spacers (10mm high). The two-row connector rotated 90 degrees (pinhead). The connection order itself is the same as the one on the motherboard. 64K-Static-Internal.pdf  schematics.

Offline elmer

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Re: What internal RAM expansion?
« Reply #16 on: 2020.August.21. 21:20:24 »
Since the Germans mounted the machines with the circuit so it can be said to be original.

That's very cool, I didn't realize that the Germans manufactured their own memory expansion board!


The two-row connector rotated 90 degrees (pinhead). The connection order itself is the same as the one on the motherboard.

Excellent, thanks! I wasn't sure if there was enough free height inside the case for that 2x5 right-angle connector.

Offline elmer

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Re: What internal RAM expansion?
« Reply #17 on: 2020.September.08. 02:05:54 »
I made a 64K internal memory expander (with 2x32K SRAM). Manufacturer's files are based on the original description.

Thank you for uploading the Gerber files for your design, I *really* appreciated seeing those! :)

The best thing (for me) was that I could actually measure where the holes for the standoffs are on the board, in relation to the EXP1 connector ... I was really wanting that information!