Years ago when calculators were quite popular, I would never buy one unless it would only allow hitting = once in a row. IOW, to prevent accidentally having the = key triggered twice, and not notice you had done it and go on your merry way.
System Manufacturer/Model Number Custom OS Windows 7 CPU AMD Phenom II X2 (dual-core) Motherboard GA-MA785GM-US2H Memory 4G Graphics Card integrated ATI HD 4200 Sound Card integrated Monitor(s) Displays Samsung 24" Screen Resolution 1920x1080
Keyboard Microsoft Digital Media Pro Mouse Logitech WIRED! PSU Ultra X4 500W Case Ultra X-blaster Hard Drives 1 SATA (750GB, 32MB cache, 7200 RPM)
1 IDE (80GB, 8MB cache, 7200 RPM)
1 SSD (Intel 320, 120GB, installed but not activated) Internet Speed 15 Mbps FIOS