shadow ram การใช้

• The video game Firetrack would also use double buffering if shadow RAM was present.
• The memory interface of shadow RAM to be implemented by copying ROM contents into RAM.
• Shadow RAM is activated by setting the most-significant bit of the memory mode number.
• For example, some hardware may be inaccessible to the operating system if shadow RAM is used.
• On the BBC Micro version, it automatically detects shadow RAM is present, the graphics are double buffered.
• When the framebuffer is running from Shadow RAM, the memory normally used for video is free for program use.
• For example, to use mode 1 with shadow RAM enabled, request mode 129 ( 128 + 1 ).
• Shadow RAM is a 20 KB block of RAM that sits outside of the real address space, accessed via operating system calls.
• Ember is golden, and has a resonant baritone voice, whereas Umber is dark grey, also known as the Shadow Ram, and has a higher, tenor voice.
• InterWord could not use the extra-low-memory teletext mode except for its main menu, and recommended that the machine have Shadow RAM ( like the BBC Master ) so that screen memory would not be an issue.
• 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.