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Uk Sony HB 75 corrupted and artifacting screen, vram already changed

by Cypher007 on 23-10-2019, 23:52
Score: 133.05 %, Type: Forum topic , Comments: 4 comments
Trying to fix an HB75, I’ve replaced the vram with new old stock 4116’s and the display is exactly the same as before. Here is also fast moving groups of pixels that flicker in some areas of the screen. I will try and attach some pics and vid of ...

FM OPLL test

by tenroom on 23-10-2019, 18:36
Score: 133.06 %, Type: Forum topic , Comments: 6 comments
Hello to all! How can I test the operation of the OPLL FM synthesizer using only Basic and the commands for working with the IN and OUT ports? I just have to check the health of the chip, play any sound. Unfortunately, I do not know how to program ...
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