Changes

One notable exception was the sound chip: while the C64 employed the splendid custom SID chip, Amstrad opted for a generic sound chip - [[AY|AY-3-8912]] - with unremarkable features. It is no surprise though as there was not much choice in off-the-shelf sound chips in early 1984. The reason is that Yamaha had patented its hardware implementation of frequency modulation synthesis (FM) in the 1970s, allowing it to nearly monopolize the market for this technology until the mid-1990s [https://en.wikipedia.org/wiki/Frequency_modulation_synthesis Source].

At its core was a [[Z80]] clocked at 4MHz - though screen display considerations, and the particular design of the [[Gate Array]] limited this to an effective 3.3MHz in practice - while the display was managed by the [[CRTC|6845 CRTC]] along with a gate-array chip.