"but it costs a lot of money to produce a prototype "...
Well, I've developed my huey card (hey, I like that name!) with a standard prom for about $30. (I've even got a Development Board in process, which will allow me to DL my proggies via the PC parallel port....saving, as you know, the time/effort of erasing/burning/inserting the prom chip) I thought about using a flash, but couldn't see the ROI for the cost.
Is there some specific reason you want flash? And, as a swag, I say a PCB-with-flash would cost $45-$60(?). So, in volume, what's the cost? How much would you need to sell it for, at what volume, to even break even on the $.
I'm willing to work on that, too, so any info/concepts will be openly considered and discussed.
Charlie