Editing ZX Spectrum (section)

=== Other integrated peripherals ===
The ZX Spectrum integrated elements from the ZX81. The keyboard decoding and cassette interfaces are nearly identical, although the latter was programmed for higher-speed loading and saving. The central ULA [[integrated circuit]] shares some resemblance with that of the ZX81, but it features a hardware-based television raster generator with colour support. This indirectly provides the new machine with roughly four times the processing power of the ZX81, as the Z80 is relieved of video generation tasks. An initial ULA design flaw occasionally led to incorrect keyboard scanning, which was resolved by adding a small [[Printed circuit board|circuit board]] mounted upside down next to the CPU in Issue 1 ZX Spectrums.{{sfn|Kean|1985b|p=127}}