operating system had enough similarity to Unix that porting Unix source to the 1616/OS was relatively painless. Minix Colin McCormack ported Minix to the 1616. He worked around the lack of a memory management unit when fork()ing by copying BSS, heap and stack of the child and parent processes before scheduling each one. The MMU on the RAM expansion card was developed to support Colin's Minix port, although it's unclear if it was ever used for this purpose. ZRDOS Conal Walsh ported the CP/M clone ZRDOS to the Z80-based disk controller card. When operating in this mode, the 68000 acted as a console for ZRDOS, although it was still possible to suspend the connection to ZRDOS, and run 1616 programs, provided they didn't need disk I/O. MGR Not strictly an operating system, the MGR windowing system run under 1616/OS, but usurped the console video and keyboard, and added virtual tty devices for each window. The MGR port required a video hack to add a higher resolution but monochrome video mode; this was done by replacing a PAL in the video circuit. Applications Most Unix and Minix programs were able to be ported to 1616/OS. Ports included: advent, ar, arc, at, cal, cat, chess (gnu), cmp, comm, compress, conquest, cron, dd, diff, ed, eroff, grep, head, indent, make, MicroEMACS, more, nroff, roff, sc, sed, sort, split, STEVIE, strings, sum, tail, tar, tee, ularn, uniq, vi, wanderer, wc, xmodem, ymodem, zmodem, zoo Several messaging or bulletin board systems were written, including Usenet and Fidonet gateways, and many utilities to allow safe shell-level dial-up access. Several computer languages were supported, including: BASIC Tiny BASIC C (HiTech C, and later gcc) Forth Lisp MUMPS 68000 assembly language The collection of 1616/OS shareware eventually grew to thirty-one 800kB floppies. Included were innumerable small utilities and ported applications from other environments. The 1616 users group Applix Pty Ltd started holding informal user group meetings in their Sydney store in 1987. The meetings were held on the second Saturday of the month, and often finished well after midnight after consumption of much pizza. Users brought their latest 1616-related creations to demonstrate and share, and discussion ranged from hardware design, operating system theory, language design, to politics and philosophy. When the Mortons sold the shop in the 1990s, the meetings moved to their house at Yerrinbool, in the Southern Highlands, NSW. When the Mortons again moved to Wollongong,