Description
Work has started again on completing this mod and it will hopefully be available early next year. Unless it’s a failure.
What is it?
It was discovered that a source of jailbars in the analogue video signals is caused by the clock division circuit in the VDP. This divided clock is output and sent to the Z80 as its main clock source. A known jailbar fix is to disable this clock divider and add a separate oscillator directly at the Z80. This cleans up most jailbars, but can cause other problems because now the VDP and Z80 are not in sync. A solution to this would be to create a divider circuit to replace the one in the VDP which takes the same clock source as the VDP and does the clock division away from the analogue video signals.
I have slowly been working on a solution which combines a clock divider with my RGB Encoder switcher.
It will be an awesome kit once finished.
Coming soon.
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