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Count your RAM banks


rje
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4 hours ago, rje said:

Banked RAM consists of up to four RAM chips, each with 512K of static RAM, if I understand correctly.

Chip 1: Banks 0-63.  Always present (required, since Bank 0 is used by the OS).
Chip 2: Banks 64-127.
Chip 3: Banks 128-191.
Chip 4: Banks 192-255.

Thus, a test would check one bank as a proxy for each 512K segment (say, banks 65, 129, and 193), and see if it can write/read that bank.

 

I wonder if a 256K static RAM would fit in those spots... horrors...

 

Is 3 RAM chips even going to be an option? My understanding was they'd only be selling 512k, 1M, and 2M variants.

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3 minutes ago, Ed Minchau said:

Is 3 RAM chips even going to be an option? My understanding was they'd only be selling 512k, 1M, and 2M variants.

The way I interpreted the FAQ is that all Commander X16s will be sold with 512K; any additional RAM must be added by the user.

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That's right.  The X16 only comes with 512K of the banked RAM.  It's socketed so it's easy to add more, and (if I recall right) they're less than $10 apiece.

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