This Read Me summarizes the key points to know when using Virtual 3.0 and provides Errata for the Virtual manual.
Using Virtual
- Virtual 3.0 works with System 6.0.x and System 7.0.x on the following 68020/68030 machines: the Macintosh IIx, IIcx, IIsi, and IIfx; the SE/30; the LCII and Classic II; the PowerBook 140, 145, 160, 170, 180, Duo 210, and Duo 230; and the Macintosh II with PMMU.
- This release of Virtual 3.0 is not compatible with 68040 machines, such as the Macintosh Quadra family.
- Holding down the tilde (~) or Escape key during boot will disable Virtual. This can be useful if you are having problems booting with Virtual installed.
- The DiskSaver feature reduces the amount of disk space used by virtual memory. When it is on, Virtual will use only the difference between the amount of real RAM in your machine and the amount of application memory you requested.
- The pop-up menu in the control panel device provides the ability to set independent application memory sizes in the two addressing modes. It does not affect the addressing mode in which your machine is running. To alter the addressing mode of your machine, use the Memory control panel.
- Click in the VIRTUAL at the top of the control panel device to see a display of information about slot card positions. This can be used to avoid memory pre-fragmentation when running in 24-bit addressing mode. Information about the PowerBook machines is not displayed as they have no card slots.
- In the Additional Settings dialog, a page size of either 4K or 8K may be selected. In general, 4K page size will usually give the best performance. However, we strongly recommend that you select 8K pages if the size of the volume or partition on which the swap file is located is greater than 256 megabytes.
Manual Errata
- In several places, the manual states that Virtual 3.0 runs on the 68040 Macintoshes. This release of Virtual 3.0 does not operate on 68040-based machines.
- On p. 5, the sentence beginning “We recommend the 4K page size for computers with small amounts of RAM and when the total …” should read: “We recommend the 4K page size for computers with a moderate to large amount of RAM and when the total …”