Marcel Birthelmer ha scritto: > See for example: http://www.beyondlogic.org/usbnutshell/usb4.htm#Bulk I was thinking of 4096 but i'm probably wrong. By the way, to Olin et al.: when you say "saturate the bandwitdth i.e. with an audio device", youo mean *that* controller - that is, if the PC has 3-4 controllers (that I guess to match the USB couples of ports you find on the mainboards), one can be overloaded but the others not? thanks Dario -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist