Steve Vickers, the mathematician tasked with writing the ROM (Read-Only Memory) software, walked into the lab one afternoon. "The machine keeps crashing when I try to draw a circle in high-res mode," Vickers said, holding a circuit board.
Study the "Issue 2" motherboard to see the simplest ULA implementation. Steve Vickers, the mathematician tasked with writing the
: Covers the management of keyboard input, tape loading (EAR/MIC), and internal audio. www.amazon.com Key Sections and Content : Covers the management of keyboard input, tape
To the naive observer, slowing the CPU down 30% to draw the screen is a flaw. To the systems engineer, it is genius. When you think of the ZX Spectrum, you
When you think of the ZX Spectrum, you picture rainbow stripes, attribute clash, and that distinctive "beep" of a BASIC program loading. Behind all of it was a single, unassuming piece of silicon: the (Uncommitted Logic Array).