Can any 8051-based devices be debugged via the USB interface rather than via the serial port? Alterrnatively, are there any 8051 devices that have a JTAG interface that is supported by Keil?
....unless it had a variant of Flashmon (or something similar) installed using FLIP that would configure the USB appropriately. Maybe this is a project for one of my students.....
how would you load it? if you have to find a means of loading it (in ISP mode) why not use the same means to debug?
Erik