0x0000-0x001F: Registers
0x0020-0x005F: I/O Ports
0x0060-0x00FF: Extended I/O Ports
0x0100-0x10FF: Internal RAM, 4096 Byte
0x1100-0x11FF: Memory Bank Register
0x1200-0x12FF: SPI CS Register
0x1300-0x13FF: USB FTDI (Unused)
0x1400-0x14FF: RTL8019
0x1500-0x1FFF: External RAM, 2815 Byte, 3 Waitstates
0x2000-0x7FFF: External RAM, 24575 Byte, 1 Waitstate
0x8000-0xFFFF: Segmented Buffer

Total RAM for Stack, Heap and Variables: 31486 Byte

Defines by Nut/OS:
NUTMEM_SIZE 4096
NUTMEM_START 0x100
NUTXMEM_SIZE 27000
NUTXMEM_START 0x1500
NUTMEM_END = NUTMEM_START + (uint16_t)NUTMEM_SIZE - 1U = 0x10FF
__heap_start = ~0xc73
