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: Emulate the entire Spectrum in software, using PIO (Programmable I/O) for pixel output.
: It takes a 14 MHz master clock, dividing it to provide a 7 MHz pixel clock and a 3.5 MHz clock for the Z80 CPU . : Emulate the entire Spectrum in software, using
Finally, the ULA symbolizes the ethos of the "home computer" era: accessibility through efficiency. Clive Sinclair wanted a computer that could fit into a briefcase and sell for under £100. The ULA was the engine of that democratization. Today, the "portable retro computer" market is booming, driven by devices like the Raspberry Pi Zero or dedicated FPGA handhelds. These devices owe their existence to the design philosophy proven by the ULA—that the soul of a computer does not require a massive chassis, but rather efficient, integrated logic. Clive Sinclair wanted a computer that could fit
For the retro computing enthusiast, the ULA isn't just a chip; it is a masterclass in cost-reduction engineering. It represents a pivotal moment in computing history where the goal wasn't just to build a computer, but to build one cheap enough to fit in every home. These devices owe their existence to the design
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