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Disabling Devices and Caches

The system software requires additional memory to support the operation of each hard disk partition or floppy disk drive. The extra memory that is used to maintain a hard disk or an extra floppy disk drive can prevent some floppy-based games from running.

Selecting Boot Options from the Amiga Early Startup Control Screen displays the Boot Options screen, illustrated in Figure D-2. This screen lets you selectively disable your hard disk partitions and any external floppy drives to leave more RAM for the programs to run.

Figure D-2.

Boot Options Screen

The Amiga displays a list of hard disk partitions and floppy drives in the Select Boot Device column. The devices in this column are listed in descending priority for the system to access when it boots. You can select any of them to override the priority.

The Control Active Devices column shows the status of the devices. Clicking on the status line toggles between Enabled and Disabled. If you are disabling hard drive devices in order to free memory for games, be sure to leave at least one bootable floppy drive enabled.

Note:

If your system has more than one floppy drive and the game lets you use additional drives, you can leave those drives (DF1, DF2, and DF3) enabled in the Control Active Devices column on the Boot Options screen.

The Disable CPU Caches option disables the Data and Instruction caches on 68020, 68030, and 68040 series processors. This allows you to retain compatibility with certain software that does not run properly when CPU caches are on. You should not disable caches if you do not have compatibility problems since caches significantly increase system performance. This option has no effect on systems with a 68000 processor.

Selecting Use implements your boot device choices for the current session only. When you reboot your Amiga, it returns to the same configuration as it had before you changed it. Selecting Cancel on the Boot Options screen cancels any changes you made and returns to the Amiga Early Startup Control Screen.

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