I do want to add some more functionality to it. First one is to include a 'preview' of the selected area, so the user gets some feel for what the region would look like as the computer does a proper render pass on it.
You could use the user port to make a communication bus, so the primary C64 can task the secondary C64s with points to test.
Especially when you're doing it in Z80 assembly.
A useful example:
On startup, flash is mapped to the first block. You can then remap the first block of RAM to be in the third block of the address space, copy flash to it, and swap that block of RAM to the first block of address space, to seamlessly switch to running your code from RAM without any tricky jumps in the software.
The chip-select logic is pretty interesting. It allows you to set what /CS, /WE, and /OE lines are active for each 256KB block of address space, and you can also invert the A18 and A19 lines to map blocks of memory to different address spaces.
I'm doing a bit of a hack with the RAM. I'm treating the 16-bit RAM as two separate 8-bit RAMs with the CPU's built-in chip-select logic.
Started designing a single-board computer using the Rabbit 2000 CPU. Planned specs so far:
29.5MHz max clock speed
512KB of flash memory
2MB of RAM
MicroSD card storage
Plenty of GPIO pins
Header for an FTDI adapter
There will of course be expansion headers, so you can add video/keyboard interface capability, or other peripherals based on requirements.
Computer engineering hobbyist, aerospace/computer nerd.
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