It turns out that the driver provided under Support appears to be the wrong one (in spite of the T1U name): it is for RT2870 (up to 802.11n) chips, and it shows 10.6 support. The T1U has a MediaTek...

Model : Hardware Version : Firmware Version : ISP : While 10.6.8 is a 64-bit release for everything above the kernel, Apple chose not to support the early Intel 64-bit computers that first shipped...