Massbus simulation

Just to let folks know, I've completed the major component selection for the design. I'm currently entering those components into EagleCAD. The UI for EagleCAD to do this isn't the most friendly, so it'll probably take me a few more days before I get them all entered (I've entered 2 today...most of it was remembering how to do it...but it's still not fun). Here are the current specs (subject to change of course!): * Two board solution (main board and i/f specific daughter board) * Single IDE disk interface * USB for getting disk images on/off the controller (from the PC it will look like a USB disk) * RS-232 serial port for managing the controller (selecting what images are mounted on which "drives" and the type of drive) * single massbus (or unibus) interface via a daughter board capable of emulating the full complement of devices * code (both uC and FPGA) will be capable of being field updated in place (ie through the USB i/f...no special connectors) * on board EEPROM contains config information across power cycles I'm currently over designing this a bit but the parts I've selected are still allowing me to come in at my (self-imposed) price targer. I'm not saying what that is now, because once you add all of the other "little bits" (Rs, Cs, Crystals, connectors, etc) the cost can inflate quite a bit. :-( It also looks like this will be a 4-layer PCB, so I don't know what the cost of that will be (yet). Ethan Dicks wrote: -- TTFN - Guy