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Knowledge Base[ Back ] [ Index ] [ Categories ] [ Next ] Q10010. How to use FastRAM?SummaryThis article describe features of using FastRAM.GuideFor activating FastRAM you need execute CPU instruction IN A,(#FB). After that, in the first memory frame (0000h-3FFFh) will paged empty 16K of FastRAM memory. You may use this memory for more fast routine speed. FastRAM not require any allocation calls for use it. And you shouldn't stored the actual data there.Remember, if you execute external program, it may destroy your data and code in FastRAM. And you must do copy your code to FastRAM again for restore it. Also you can't call BIOS or DSS function during FastRAM are activated. For deactivating FastRAM you need execute CPU instruction IN A,(#7B). After that, a first memory frame will paged back 16K of normal memory. We recommend to disable interrupts for avoid any errors when you will switch FastRAM. More informationToday, only 16K of FastRAM are available for use.If you want to use the interrupts, you should put interrupt handler in #0038. If you plan to use Accelerator in your FastRAM-routine, you must placed data for it more high than #3FFF. FastRAM will be useful in following cases: 1. If you not use the Accelerator. 2. If you use the RAM data not so often. 3. If program stack was placed into the FastRAM. 1 August 2002. |
