z80 databus snapshot

This is a snapshot of a data bus line.  The shape bothers me. I wonder if it is possible a device connected to this bus is behaving badly? The system is looping.  I was suspecting bad ram (or eprom) but could it be the z80 itself (is kinda warm to the touch).

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First "Fun with Morse Code" Inter highschool Contest photos

Imahe
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Kenwood HF-50Mhz TRansceiver TS-680V Review Digest

Imahe
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Hot-Rod Your ICOM IC-725-Series Transceiver by Jukka Vermasvuori

Imahe
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