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NTSC Spectrum: Difference between revisions
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Mention the 5C114E ULA, failure to meet FCC regulations, blurb about performance
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One example of an NTSC Spectrum | The '''NTSC Spectrum''' was sold in Chile. It was not sold in the USA as it did not meet FCC regulations<ref>The ZX Spectrum ULA, Chris Smith, 2010, p. 252</ref>. Instead, the [[Timex 2000 series|TS2068]] was produced. | ||
One example of an NTSC Spectrum has been found in Chile. As far as is known, it is the same as a normal (PAL) Spectrum with the following differences: | |||
* The CPU is clocked at 3.5275 MHz | * The CPU is clocked at 3.5275 MHz | ||
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Many thanks to Claudio Bernet for running all the tests on his machine. Three photos are available: [http://img.photobucket.com/albums/v400/zxspectrum/SSA40755.jpg 1], [http://img.photobucket.com/albums/v400/zxspectrum/SSA40764.jpg 2], [http://img.photobucket.com/albums/v400/zxspectrum/SSA40769.jpg 3]. | Many thanks to Claudio Bernet for running all the tests on his machine. Three photos are available: [http://img.photobucket.com/albums/v400/zxspectrum/SSA40755.jpg 1], [http://img.photobucket.com/albums/v400/zxspectrum/SSA40764.jpg 2], [http://img.photobucket.com/albums/v400/zxspectrum/SSA40769.jpg 3]. | ||
Another NTSC Spectrum has been found by Richard Atkinson, containing a 5C114E ULA, dated 8248[http://worldofspectrum.org/forums/showthread.php?p=763629]. | |||
Although the clock rate is slightly higher, any software making heavy use of the lower 16 KB of RAM will run slower on the NTSC Spectrum, since the proportion of time during which memory is contended is greater. This is a result of the NTSC Spectrum's need to render the display at a higher frame rate (60 Hz instead of 50 Hz). | |||
== References == | |||
<references/> | |||
{{CC-BY-SA-techwiki|NTSC Spectrum|NTSC_Spectrum}} | {{CC-BY-SA-techwiki|NTSC Spectrum|NTSC_Spectrum}} | ||