This is true. I have an old B&W with an ADB plug and an
equally venerable Wacom pad. I have used it though, but
Photoshop 7.0 didn't see it as an alternate input device. It
was like a mouse in every respect to OSX.3.9.
PowerMac G5 Dual 2.0Ghz, 1536Mb RAM, 160Gb HD, 23" Studio Display
iMac 333Mhz, 160Mb RAM, 6Gb HD
PowerMac 8500 120Mhz, 80Mb RAM, 2Gb HD, 17" AppleVision Display
Mac IIsi 20Mhz, 16Mb RAM, 200Mb HD, 15" Sony Trinitron Display
3G iPod 40Gb
512Mb iPod Shuffle