This is a new page covering my work with the ISIS-II Operating System.
Mark Ogden has reverse engineered most of V4.1 back into the PLM80 and ASM80 source files. These files will validate against the original ISIS-II V4.1 executable.
I have spent a lot of time disassembling these different versions of ISIS-II and the tools that that ran under it. I have generated a 7Z file which contains the tools, disk images, and configuration files to generate assembler source files for OS versions and tools listed below and validate the code generated at the binary level to the original binary code.
I hope to be able the generate the PLM80 source for all these versions but that takes a lot of time. I have used the tools and tricks than Mark uses but it is certainly not a complete solution. One could develop a program that would read in the assembler source and produce PLM80, but that would also take a great deal of work.
Last updated: 18 October 2017