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have bad grounding characteristics which allow small static discharges (or sunspots, we're not 100% sure which) to reach the bridge chip. This causes the bridge chip to wedge/reset itself. There's no known cure short of rebooting. The bug manifests itself by the STAT_CHG return 0xff when read. This is impossible because the upper bits are reserved (and therefore zero). In addition, some of the lower bits are one only for memory cards, which OLDCARD doesn't support, so if they are set, something seriously foobar'd is going on. So far we've seen this in exactly one brand of pcmcia <-> isa bridge which plug and play identifies only as "VIA PCMCIA CARD". This card just has buffers on the isa card and the actual bridge chip on the remote slot, which is connected by long ribbon cables. We think this long cable run, coupled with the lack of coupling capacitors is a major reason why it is so static sensitive while its bretheren aren't. Work Supported by: Timing Solutions, Inc. MFC After: 3 days
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