🚀 go-pugleaf

In article <35221@apple.Apple.COM> dwells@Apple.COM (Dave Wells) writes:
>Yes, it's true.  The Macintosh IIci is the first to allow the RAM in bank B
>to be of higher density than the RAM in bank A.  In fact, you can install RAM
>in bank B and take the SIMMs out of bank A and the Macintosh will work fine.
>(Minus built-in video, which uses RAM from bank A.)
>
>This fantastic new functionality :-) is enabled by the new Memory Decode Unit
>chip that replaces the old GluChip from previous Macintosh II models.

Correct me if I'm wrong, but I was under the impression that the reason this
is an important feature is that cycle-stealing for the built-in video slows
down access to memory in bank A.  The ability to have higher density memory
in bank B rather than bank A should then result on a lesser performance
degradation when using built-in video.  If you have 5MB of RAM, and you put
4MB on bank A and 1 on bank B (the only possible configuration before),
the 4MB will be "slower memory" than the 1MB.  Thus it is useful and
desirable to put higher density RAM in bank B when using built-in video.

>-Dave

-Ivanski

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