I might just try that this weekend with my PB 145b.Yes, there is software to rotate the screen image. Search the forums for it. Although I can't really see the use of having a screen that's only 400 pixels wide.
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Macs Liberated: SE (2), IIsi, PB 145b, Quadra 700, 6100 (2), PB 5300, PowerMac 5400/200, Performa 6400/180
PCs liberated from Windoze: 3