PS/2 Keyboard adapter for TRS-80?

On 18 Jan 2012 at 13:42, Jim Brain wrote: It seems that it depends on your exact needs. For example, the ATMega32 can be made to talk to a USB mouse: http://courses.cit.cornell.edu/ee476/FinalProjects/s2007/blh36_cdl28_d ct23/blh36_cdl28_dct23/index.html I suspect that the same is true of a USB keyboard and other simple HID devices. But those are exceptions and not a general solution. There are interface chips, such as the FTDI Vinculum and the Maxim MAX3421, which probably wouldn't break the bank. With that you can implement a lightweight host on an Arduino: https://github.com/felis/USB_Host_Shield_2.0 LUFA provides specialized (e.g. HID host, MIDI host) host capabilities for a limited set of peripherals using the AT90SUB chips. http://www.fourwalledcubicle.com/LUFA.php On the other hand, silicon's getting cheaper, so implementing a host design using ARM or PIC32 isn't a big deal and both have USB host capabilities (and vendor-supplied software to go along with it). But if you're looking for a general host controller with 5V Vcc and a DIP package, I suspect that you'll be looking a long, long time. --Chuck