Kingston Technology MC133PD Mapped, report all, 16meg, Unmapped, 16M, Mapped, report MM, 16meg

18 Appendix A Configuration Options

The disadvantage is that you can't have any other memory boards in the system. If your system has only 1 megabyte on the planar, this is not a great loss. However, if you have a lot invested in Micro Channel memory boards, you probably want to keep using them. To use this other memory, you need to select "Mapped" or "Unmapped."

Note: In some systems, the MCMaster cannot disable motherboard memory. If the MCMaster signs on with "Hardware Rev 00.11," you have one of these systems. In this case, the MCMaster behaves as it would in "Mapped, Report All" mode except that the MCMaster uses only its own memory. The host CPU (and any other busmasters) still see system memory first, followed by MCMaster memory.

Mapped, report all, <16meg

This works the same as "Mapped, report all" except that system memory is limited to 16 Megabytes regardless of how much memory is physically installed in the system. This is required in a 32-bit system (e.g. Model 70, 80, 95) with 16-bit adapters installed.

The 16-bit version of the Micro Channel bus allows only 24 bits of addressing. If a DMA device, such as the floppy disk controller, attempts to write past the 16MB boundary, errors can occur due to this limitation.

Unmapped, <16M

This works the same as "Unmapped," but with the same 16 Megabyte limit as described above.

Mapped, report MM, <16meg

This is not the same as "Report MCMaster memory." In this mode, planar memory is still visible from the host point of view, and the same advantages and disadvantages of "Mapped, report all" apply.

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