Re: Ultimax questions

From: Rob Clarke <>
Date: Sun, 20 Oct 2013 15:16:38 +0200
Message-ID: <>
On 20/10/2013 14:27, Michał Pleban wrote:
> Hello!
> Steve Gray wrote:
>> Will Max support something bigger than 6116? I ordered a few cheap 32k sram chips in sdip that don't take much room... Even if we cant use the whole capacity.
> Short answer: No. The /EXRAM line is active only at $0800-$0FFF.
Have you tested that? I couldn't find any evidence that the decoding 
logic in the 6703 had ever been fully documented. It's possible that 
/EXRAM may be active up to $3FFF.

But even if it does, what then? I suspect even the MAX Basic ROM does 
not intelligently probe for usable memory and the extra 2k of RAM is 
hardcoded. So yes, we could probably fix the ROM to use the extra RAM 
but I have no intention of typing in 32k BASIC programs on a MAX 
keyboard anytime soon. :-)


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Received on 2013-10-20 14:00:04

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