Am 25 May 2005 10:57 meinte Chris Muller: USB to ISA interfaces have been among the first USB stuff implemented. A google search should help here. As usual not the interface but the drivers are the real hassle. If you can't find any ready made hardware, it's an easy job to use an existing USB-ISA bridge chip as the SMSC USB97C100. This one is especialy handy, since it contains not only a 8051 to run your own interface specific code, but also a PC compatible 8237 DMA controler (Hey, if you want to go back in time, we should realy use the old stuff), and an almost complete ISA bus. It's a no brainer to add ISA to any USB host capable device. At the lowest level, just create a simple block protocoll to transmit register read/write to the 8051, or send and return data from there. I found it quite easy, but there may be other, better suiting chips. Hans -- VCF Europa 6.0 am 30.April und 01.Mai 2005 in Muenchen http://www.vcfe.org/