rcd@cbnewsj.att.com (rana.c.dutt) (03/23/91)
This falls into the hard-to-believe category: accessing your ICD hard drive can mess up your screen image. Certain DMA accesses or electrical noise to the ICD host adaptor will freak out the video refresh logic. Spectre 3.0 shows up this problem. Right after the "Welcome to Macintosh", my mono monitor screen became a blurry fuzz of quivering horizontal lines and distorted shapes. Says I, "Huh?" Had never seen this before, certainly not with Spectre 2.65. Left a plea for help on GEnie's Gadgets RT, but even Dave Small was puzzled. Then came some news from a couple of other people who had the same problem: it's the ICD host adaptor, they said. To solve the problem, they said, get a 22 pF capacitor, and solder it between pins 12 and 13 of the DMA IN connector on the host adaptor board. I called up ICD, and they said, yes, it's a known problem, and yes, the solution is as described above. Hope this helps someone, Rana Dutt rcd@mtqua.att.com