Make sure your computer screen is about 25 inches, or an arm's length, away from your face. The center of the screen should be about 10-15 degrees below eye level. Cut glare by using a matte screen filter. You can find them for all types of computers, phones, and tablets. Follow the 20-20-20 rule: every 20 minutes, look at an object at least 20 feet away for at least 20 seconds. Take a longer break of about 15 minutes after every 2 hours you spend on your devices. Use artificial tears to refresh your eyes when they feel dry. Try putting a humidifier in the room where you most often use a computer or other device. Make sure the lighting in the room you’re in is bright enough. You don’t want your device to be brighter than the surroundings. If you wear contact lenses, give your eyes a break by wearing your glasses. Get regular eye exams. You might need to use a different pair of glasses when you’re working on a computer. You can also make sure your devices are set for eye comfort. Raise the contrast on your screen. Change the brightness of the screen. It shouldn’t be lighter or darker than your surroundings. Lower the color temperature of your screen. That means it will give off less blue light, which is linked to more eyestrain. Raise the device’s refresh rate. That will cause less flickering of the screen.
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The HP 3000 series did not add paging until the PA-RISC generation, 10 years later (although MPE V it had a form of paging via the APL firmware, in 1978). Tandem added support for 32-bit addressing in its second machine; HP 3000 lacked this until its PA-RISC generation. Paging and long addresses was critical for supporting complex system software and large applications. The T/16 treated its top-of-stack registers in a novel way; the compiler, not the microcode, was responsible for deciding when full registers were spilled to the memory stack and when empty registers were re-filled from the memory stack. On the HP 3000, this decision took extra microcode cycles in every instruction. The HP 3000 supported COBOL with several instructions for calculating directly on arbitrary-length BCD (binary-coded decimal) strings of digits. The T/16 simplified this to single instructions for converting between BCD strings and 64-bit binary integers. In the T/16, each CPU consisted of two boards of TTL logic and SRAMs, and ran at about 0.7 MIPS.
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