[kokkiklhs]

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On CDesp said

Sorry for the delay.

You can’t add more ram (or actually you can but it will not work) without also change the code in roms. If you want to run CP/M with more ram you need the expansion box because it contains new roms (and more ram) that support paging so you can access the extra RAM.

So the short answer adding more ram does not make it available to the system like PCs.

Chris, is there a chance of reverse-engineering the original Grundy RAM expansion board somehow? Have you ever tried something like that, would it be possible? I have seen similar projects like e.g. the Camputers Lynx FDD controller replica, which can give a totally new perspective to anyone who owns just a standalone rare machine of this category…

I suppose that right now you are the absolutely only one who could start such a project, so the Newbrain community hopes globally rely upon you! 🙂

[kokkiklhs]

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Very nice project, thank you, Chris!

I was wondering if there’s a way for more RAM to be included in this new board.

I am mainly interested in such an option, as I have a NB AD with disk controller but no RAM expansion, so I am afraid that I’ll never be able to boot CP/M with 32k…

Would an internal RAM upgrade e.g. to 64k or more be possible?

Or, if internal RAM upgrade is impossible, is there some workaround for me to build a replacement external DIY RAM expansion?

Thanks!

[Author]

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