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The W5100 has the undocumented feature to wrap around the Address Register on an Auto-Increment at the end of physical address space to its beginning. However, the only way to make use of that feature is to have only a single socket that uses all of the W5100 physical address space. But having only a single socket by defining SINGLE_SOCKET comes with downsides too: One mustn't call into IP65 network functions anymore after w5100_config(). Additionally the program doesn't support 'W5100 Shared Access' anymore (https://github.com/a2retrosystems/uthernet2/wiki/W5100-Shared-Access).
IP65 consists of three parts:
- A TCP/IP library to be used by 6502 asm programmers using the ca65 macro assembler
- A TCP/IP library to be used by C programmers using the cc65 6502 C cross compiler
- Several ready-to-run TCP/IP programs using one of the libraries
All three parts are available for three 6502 based target systems:
- The C64
- The Apple II
- The ATARI (XL)
IP65 requires Ethernet hardware. There's no support for TCP/IP over serial connections whatsoever.
On the C64 there are two supported Ethernet devices:
On the Apple II there are three supported Ethernet cards:
- The Uthernet - emulated by AppleWin and GSport
- The LANceGS
- The Uthernet II
On the ATARI (XL) there are two supported Ethernet devices:
- The Dragon Cart - emulated by Altirra
- The Dracarys