Kingston Technology MC133PD Memory Options, Mapped, report all, Unmapped, Report MCMaster Memory

Appendix A Configuration Options 17

Memory Options

Default: Mapped, report all

Options: Unmapped

Report MCMaster memory

Mapped, Report all, <16M

Unmapped, <16M

Mapped, report MM, <16M

Mapped, report all

In this configuration, the MCMaster remaps memory so that, from the MCMaster CPU's point of view, its own memory appears "first." This means that DOS applications that run in low memory will be running in the MCMaster's onboard 32-bit memory. Planar memory, and any other memory boards, are mapped above the MCMaster's memory.

The disadvantage of mapping is that another busmaster adapter in the system sees memory from the host system's point of view, while the MCMaster has its own viewpoint. We supply drivers to allow mapping to work under Windows 3.0/3.1 or OS/2 1.2/1.3 with busmastering SCSI controllers. Their use is explained in "Special Drivers for SCSI Adapters."

Unmapped

"Unmapped" mode is just what it says. If you select "Unmapped," the MCMaster's memory is at the top of the memory map from its own point of view as well as from the host point of view, thus eliminating the need for special drivers.

Report MCMaster Memory

If you select "Report MCMaster memory," any memory other than the MCMaster's memory is ignored by both the MCMaster and the host CPU. This combines the benefits of "Mapped" and "Unmapped" modes. Your applications are guaranteed to be running in the MCMaster's 32-bit memory, and the MCMaster's memory starts at address 0000 from both the MCMaster and the host point of view.

MCMaster User’s Guide - Rev. B06 Kingston Technology Company