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Z80MC Front panel problem.


 

I've got wierd problem on my Front panel board.

All keys work fine and display and LEDs are ok, but the F+E soft reset doesnt do anything.

F+0 does a Hard Reset with display showing F-0? 01,, after a power up, but after doing something like E 8000 and a few steps up or down ,pressing F+E for a Soft reset does nothing. Pressing F+0 displays Soft? 01?

Ive checked the board for shorts, and component values ( wondered if one of the R1 10k had gone o/c? but cant work out what has gone wrong.?

Any pointers appreciated.

Paul G3WYW

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