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Timex Sinclair T/S 1000 (a ZX81 with the same circuit board from the same factory, but with a 2K x 8 RAM chip instead of 1K. This is typically a U.S. model, with a VHF NTSC RF modulator and slightly improved RF shielding, but are the same BASIC machine)
BASIC keywords and character mapping are slightly altered on Ringo R-470 compared to the ZX81. Entry is still accomplished per keyword token, obtained using different cursor modes and key combinations, but these are different from the ZX81.
EAGLE contains a schematic editor, for designing circuit diagrams. Schematics are stored in files with .SCH extension, parts are defined in device libraries with .LBR extension. Parts can be placed on many sheets and connected together through ports. The PCB layout editor stores board files with the extension .BRD.
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Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Learn how to download and install or uninstall the Desktop Gold software and if your computer meets the system requirements.
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This pattern can be generalized to updating. In the event of an update, the hot spare would activate, the main system would update, and then the updated system would resume control. The earliest true Dynamic Software Updating system is DYMOS (Dynamic Modification System). [4]