[comp.sys.apple2] Hardware Ref #2

gwyn@smoke.BRL.MIL (Doug Gwyn) (05/02/90)

In article <1990May1.171043.7095@mintaka.lcs.mit.edu> dcw@sun-bear.lcs.mit.edu () writes:
>... I happened to see the //GS Hardware Ref, 2nd edition.
>... In several places it mentioned that the max expansion RAM
>in a ROM 3 is 4.3MB.

4.3MB is sure a strange quantity.

>... Is this really how much DMA RAM you can have or is it really
>how much the system will recognize and that 8MB Octoram you have
>is useless?

Note that the 1st Ed. of the same manual said in several places
that the maximum main memory RAM supported was 4MB, but it was
actually 8MB, although apparently DMA problems are worse past 4MB.