mac dropped frames

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Joined: Jan 25 2002

I am editing dv on a recently (last year) acquired iBook which has a PowerPC G3, 20GB hard drive, 256 RAM, 500 MHZ, ATI Ragel M3p29s display card built-in and using Premiere 6 software.

Recently frames have been dropping during capture from my dv cam: Sony DCR TRV900, and becomes worse over time. I have recently defragged some serious defragmentation and unsure what/where to check next.
I looked at your response to a similar problem from last year but the Windows advice does not seem relevant to mac [is that correct?]
I am in the US [NTSC] and would appreciate any advice or suggestions on how to proceed.
Steve Steele