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Home Forums 68kMLA quadra 650 — #22
Post #22 by equill
Source Forum68kMLA
CategoryTroubleshooting
Post DateMon, 17 Mar 2008 - 12:19
Original URLhttps://68kmla.org/bb/threads/quadra-650.12364/
Post
If your System is reserving most additional RAM beyond 8MB to itself it is likely that your Mac is functioning with 24-bit addressing instead of 32-bit. It can see but cannot address more than 8MB under 24-bit, and any excess over 8MB is reserved to the System. Open your Memory control panel, select 32-bit addressing from the relevant panel, and then reboot. Default 32-bit addressing was not part of the system operation before System 7.0. Macs with 32-bit dirty ROMs (ie, containing 24-bit code), need Mode32 or Mode32 7.5 (under System 7.5) to take advantage of the control panel selection.

How a 68040/33MHz Quadra 650 might be suffering an attack of the 24-bits eludes me, however—since it was not designed to support any System lower than 7.1—without being able to see your system. Are there remnants of a previous installation loungeing about on your HDD?

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