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I can understand wanting to use F1's. I used to write quite a bit of HC11 code. I even used F1 for one project. I still have a few laying around. I have also used the free tools for the HC11. I don't plan on going back anytime soon.
Of course, '877 runs up to 20Mhz (5mips) and has 4x the memory in single chip mode. It also has 8 10bit ADC's, 1 UART, 2 PWM's, etc... In many ways it is very similar to F1 in single chip mode only faster with more memory. And 2 chips cost the same from digikey as the PLCC to DIP adapter. The only glue logic required to get it running is a crystal or ceramic resonator. If that is too expensive then a resistor and capacitor will also work for the clock. Programing is in circuit via the ICE. In fact the demo board that comes with the ICE has enough proto area to accomplish most of what people want with the second circuit board.
Of course I still can't figure out how you were going to build a minimal x86 board for < $100 and still have enough money to interface it to the rest of your system. Especially not with digikey prices.
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