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Mirror directly approved by Phil Karn, KA9Q.
The KA9Q NOS TCP/IP package began life way back in 1985 on a surplus Xerox 820 computer board running CP/M with a 4 MHz Zilog Z-80 CPU, 64KB of RAM and a 8" floppy drive holding all of 243KB. Later, it moved to the IBM PC with the 8088 and 80286 CPUs running MS-DOS.
KA9Q NOS was only the second known implementation of the Internet protocols for low-end computers. Unlike PC/IP, KA9Q NOS could simultaneously act as an Internet client, a server and an IP packet router, and handle multiple client and server sessions.
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Ddr-Z8E is a device driver library for the Zilog Z8 Encore!(r) microcontroller. The library supports I/O, IRQ, RS-232, I2C, SPI, A/D, WDT, ticker and built in flash memory as well as utility modules, e.g. for debugging and binary number representation.