![]() Bullets from a 20 mm gun, on the other hand, move at more than 1000 m/second. A plane traveling Mach 1 is moving about 1,200 km/h - the exact number depends on a few things like your altitude and the humidity. But it also has the distinction of being the first plane ever to shoot itself down. The supersonic aircraft was impressive, although it suffered from some fatal flaws. Take the case of the Navy’s Grumman F11F Tiger aircraft. ![]() That’s fine up until the point that it isn’t. We rarely consider that wire has any resistance, for example, or that batteries have a source impedance. We take shortcuts all the time with our physical models. To see one being made from scratch is special then, and it would be nice to think that a few other people might learn how a computer works the Sinclair way.Ĭontinue reading “Building A Sinclair ZX81 In 2022 With All New Parts” → Posted in Retrocomputing Tagged sinclair, sinclair zx81, zx81 Sure it had many faults, but simply having an affordable real computer at all in 1981 was special. The video below the break is the first of what is to be a series, and he will be looking at a readily available 3D printed ZX81 case and the re-manufactured membrane keyboard.įor those of us who first learned to code in its meager 1k of memory the ’81 will always be a special computer. The PCB is the same size as the original, and he’s paired it with a keyboard PCB using tactile switches. From here in 2022 the original Ferranti ULA chip that contained all the logic is unobtainable except by raiding another ’81, so he’s using a design that has the same functionality in 74 series logic. The ZX81 was Sir Clive’s second Z80-based computer, and its low price made it an instant success which paved the way for the legendary ZX Spectrum. Following the latter path, is answering the question as to whether it’s possible to build a Sinclair ZX81 from all-new parts in 2022. ![]() Some take the emulation route, but others demand a solution that’s closer to the original hardware. As the supply of genuine retrocomputers dwindles and their prices skyrocket, enthusiasts are turning their eyes in other directions to satisfy their need for 8-bit pixelated goodness.
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