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README *** 20 OCTOBER 2019 *** I wrote this debugger/simulator back in 2007 as a way of alleviating boredom on the cheap in a foreign country. I had many big plans for it which never eventuated in the 12 years since I wrote it. As it stands, it allows you to run small programs, single step, examine registers, and disassemble memory. Yep, pretty basic stuff! My primary reason for uploading this to GitHub is so it can be seen should somebody be crazy enough to continue it. *********************** This is the embryonic beginning of nd - a debugger/simulator,in the style of Borland Turbo Debugger, for the Data General Nova minicomputer. It is very much a work in progress. There is still a lot of work to be done, not in the least being the simulation of more I/O devices and giving it a better user interface using the ncurses library. Why am I doing this? Firstly, my C skills are pretty rudimentary so writing this is a way of improving them. With problems, one encounters solutions and learns something from them in the process. Secondly, I have a pair of Nova 3 minicomputers and an Eclipse S/130 in Australia which I couldn't take with me to Scotland. Surprised? Yes, I miss them and being able to toggle trivial little program into the front panel switches. My initial aim is to provide an emulation of the basic hardware and some necessary I/O. To be able to boot an operating system isn't high up on my list at the moment. For something like that, go to http://simh.trailing-edge.com and download simh. No really, do it!!! That is not to discount the possibility of booting an OS in the future. Anything can happen really. 'Tis a wide world I've opened the doors to, and with increasing ability anything is possible. ;-) Emil Sarlija - email: emil AT chookfest DOT net CHANGES 02 JUN 2007 - First executable & compilable version, only supports Ver 0.01 "bootloader" paper tape format, no I/O 05 JUN 2007 - Added a bunch of I/O instructions, CPU instructions, and TTO Ver 0.02 simulation 05 JUN 2007 - The simulator now dumps memory contents to screen as it loads Ver 0.021 the program, plus bugfixes & cleanup - added by Toby Thain (Many thanks, great idea! - Emil) 06 JUN 2007 - Added examine memory and disassemble commands. Also added Ver 0.022 disassembly to the memory dumping while loading 07 JUN 2007 - Fixed a bug in SKP<t> CPU. Added MUL/DIV and stack instructions. Ver 0.03 Minor code clean-up as well. Really minor
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A debugger for code written for Data General Nova minicomputers
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