O2 Xda
The O2 Xda brand was a range of Windows Mobile PDA phones, marketed by O2, developed by O2 Asia and manufactured by multiple OEMs (mainly HTC, Quanta and Erima). The first model was released in June 2002. The last models came to market in 2008. The "X" represents convergence of voice and information/data within one product; the "DA" stands for "Digital Assistant", as in PDA.
Retired models
Xda
The first product released in the XDA range.
206 MHz Intel SA-1110 microprocessor
Initial models had 32 MB RAM, which was quickly increased to 64 MB
240×320 color touchscreen (12bit) 4096 colors
I/O: cable (USB, RS-232), IrDA & SD flash card
Dual-band 900/1800 MHz radio
HTC codename: HTC Wallaby
Xda II
The successor to the Xda, the Xda II, was released in November 2003.
Intel XScale PXA263 (400 MHz)
128 MB SDRAM, 64 MB ROM
3.5" Transflective 65,536 colour LCD (240×320 pixels)
I/O: cable (USB, RS-232), IrDA, Bluetooth, SD flash card & SDIO flash card
Integral VGA camera (640×480 pixels)
HTC codename: HTC Andes, but variants were known as HTC Himalaya