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- Shadow_RAM_(Acorn) abstract ""Shadow RAM", on the Acorn BBC Microcomputer and Master-series microcomputer is a special framebuffer implementation to free up main memory and permit double-buffered graphics.The BBC Micro and Master-series machines used the 8-bit 6502 and 65C102 processors with a 16-bit address space. The address space was split into 32 KB RAM (0x0000 to 0x7FFF), 16 KB Sideways "paged" address space (0x8000 to 0xBFFF) and 16 KB operating system space (0xC000 to 0xFFFF).Video memory was allocated from 0x7FFF downwards as necessary, from 1 KB (Teletext mode 7) to 20 KB (modes 0-2). With only 32 KB RAM available, the video memory could eat a very sizable amount of memory. Shadow RAM is a 20 KB block of RAM that sits outside of the real address space, accessed via operating system calls. When the framebuffer is running from Shadow RAM, the memory normally used for video is free for program use. Shadow RAM is activated by setting the most-significant bit of the memory mode number. For example, to use mode 1 with shadow RAM enabled, request mode 129 (128 + 1).By switching between main and shadow memory on alternate frames, double-buffered video could be used. Acorn provided a demonstration program in BASIC showing scrolling cloud animation with and without double buffering. The video game Firetrack would also use double buffering if shadow RAM was present.Shadow RAM was fitted as standard on the "Model B+" BBC Micro and on the BBC Master series, but was an optional, third-party extra feature on the "Model A" and "Model B" BBC Micro systems.".
- Shadow_RAM_(Acorn) wikiPageID "11453313".
- Shadow_RAM_(Acorn) wikiPageLength "1910".
- Shadow_RAM_(Acorn) wikiPageOutDegree "18".
- Shadow_RAM_(Acorn) wikiPageRevisionID "388271081".
- Shadow_RAM_(Acorn) wikiPageWikiLink Acorn_Computers.
- Shadow_RAM_(Acorn) wikiPageWikiLink BBC_BASIC.
- Shadow_RAM_(Acorn) wikiPageWikiLink BBC_Master.
- Shadow_RAM_(Acorn) wikiPageWikiLink BBC_Micro.
- Shadow_RAM_(Acorn) wikiPageWikiLink Bank_switching.
- Shadow_RAM_(Acorn) wikiPageWikiLink CPU.
- Shadow_RAM_(Acorn) wikiPageWikiLink Category:Acorn_Computers.
- Shadow_RAM_(Acorn) wikiPageWikiLink Category:Computer_memory.
- Shadow_RAM_(Acorn) wikiPageWikiLink Category:Memory_management.
- Shadow_RAM_(Acorn) wikiPageWikiLink Central_processing_unit.
- Shadow_RAM_(Acorn) wikiPageWikiLink Double_buffering.
- Shadow_RAM_(Acorn) wikiPageWikiLink Firetrack.
- Shadow_RAM_(Acorn) wikiPageWikiLink Framebuffer.
- Shadow_RAM_(Acorn) wikiPageWikiLink Kilobyte.
- Shadow_RAM_(Acorn) wikiPageWikiLink MOS_Technology_6502.
- Shadow_RAM_(Acorn) wikiPageWikiLink Multiple_buffering.
- Shadow_RAM_(Acorn) wikiPageWikiLink Operating_system.
- Shadow_RAM_(Acorn) wikiPageWikiLink Random-access_memory.
- Shadow_RAM_(Acorn) wikiPageWikiLink Random_access_memory.
- Shadow_RAM_(Acorn) wikiPageWikiLink Sideways_address_space.
- Shadow_RAM_(Acorn) wikiPageWikiLink Teletext.
- Shadow_RAM_(Acorn) wikiPageWikiLinkText "Shadow".
- Shadow_RAM_(Acorn) wikiPageWikiLinkText "shadow RAM".
- Shadow_RAM_(Acorn) wikiPageWikiLinkText "shadow".
- Shadow_RAM_(Acorn) hasPhotoCollection Shadow_RAM_(Acorn).
- Shadow_RAM_(Acorn) wikiPageUsesTemplate Template:Compu-storage-stub.
- Shadow_RAM_(Acorn) wikiPageUsesTemplate Template:Unreferenced.
- Shadow_RAM_(Acorn) subject Category:Acorn_Computers.
- Shadow_RAM_(Acorn) subject Category:Computer_memory.
- Shadow_RAM_(Acorn) subject Category:Memory_management.
- Shadow_RAM_(Acorn) hypernym Implementation.
- Shadow_RAM_(Acorn) type Software.
- Shadow_RAM_(Acorn) comment ""Shadow RAM", on the Acorn BBC Microcomputer and Master-series microcomputer is a special framebuffer implementation to free up main memory and permit double-buffered graphics.The BBC Micro and Master-series machines used the 8-bit 6502 and 65C102 processors with a 16-bit address space.".
- Shadow_RAM_(Acorn) label "Shadow RAM (Acorn)".
- Shadow_RAM_(Acorn) sameAs m.02rd7qn.
- Shadow_RAM_(Acorn) sameAs Q7460581.
- Shadow_RAM_(Acorn) sameAs Q7460581.
- Shadow_RAM_(Acorn) wasDerivedFrom Shadow_RAM_(Acorn)?oldid=388271081.
- Shadow_RAM_(Acorn) isPrimaryTopicOf Shadow_RAM_(Acorn).