ZX Spectrum +2: Difference between revisions
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*''Problems:'' | *''Problems:'' | ||
**[https://www. | **[https://www.bytedelight.com/wp-content/uploads/2021/05/ZX-Spectrum-128K-video-fixes-and-video-cables.pdf Requires TR4 mod for misplaced transistor.] | ||
** Not only should TR4 be rotated but also TR7. If TR7 is mounted in the false direction then the transistor, which normally acts as an emitter follower, only acts as a diode. The base-collector-diode together with R65 realizes the OR function. But in this case A0 is loaded by 470 Ohm which would be avoided if TR7 would be mounted correct. ([https://www.worldofspectrum.org/forums/discussion/comment/834739/#Comment_834739 Ingo]) | ** Not only should TR4 be rotated but also TR7. If TR7 is mounted in the false direction then the transistor, which normally acts as an emitter follower, only acts as a diode. The base-collector-diode together with R65 realizes the OR function. But in this case A0 is loaded by 470 Ohm which would be avoided if TR7 would be mounted correct. ([https://www.worldofspectrum.org/forums/discussion/comment/834739/#Comment_834739 Ingo]) | ||