6303 CPU card for RC2014

With the compiler now up to scratch the board is able to boot and run Fuzix.

The 6303 is a descendent of the 6303 so the question of 6803 support naturally comes up. As far as I can tell the only difference of relevance is that the 6303R has Vcc on pin 21 and a standby signal on pin 21, whilst the 6803 has Vcc on pin 7 and Vstandby (for the iram) on pin 21.

If I am reading the manuals right it should be sufficient to replace R4 with a wire link to run a 6803 processor. Once I have one to hand I will test.

The 6303 board is booting and able to load a bootblock off a CF adapter and run it correctly. At that point I got annoyed with the free 6803/6303 tools available and decided to take a slight diversion.

I'm currently turning the core of cc65 into cc6303, as well as adding it to the Fuzix assembler (based off the freed up MWC one) and the linker I wrote. There may therefore be a delay before any more visible software progress happens on the board itself.