Retro UNIX 8086 v1 operating system has been developed by Erdogan Tan as a
special purposed derivation of original UNIX v1 (by Ken Thompson, 1970-1972).
Source code has
been ported from PDP-11 Unix assembler syntax to Microsoft Macro Assembler
(INTEL x86 real mode) syntax and original unix source code has been modified for
IBM PC/AT compatibility with standard ROM BIOS functions, without
dropping/removing original UNIX v1 multitasking (time-sharing) features.
Retro UNIX 386 v1 is 32 bit (80386
protected mode) version of Retro UNIX 8086 v1. Retro UNIX 386 v1 operating
system kernel and binaries have been written in assembly language syntax of
Netwide Assembler (NASM).
Retro UNIX is a
predecessor to SINGLIX operating system project.