[vcf-midatlantic] LSI-11 simulator (looking for the author)

Richard Cini rich.cini at gmail.com
Sat Aug 15 08:46:08 EDT 2020

All –


                I’m cleaning out my shop (I will have a “to go” list at some point) and going through magazine articles I saved. One peaked my interest, from Circuit Cellar (7/1996) by Robert W. Meister, was an LSI-11 simulator. I liked working on my Altair32 project, so I thought this would be good to play with.


                I was able to find the original simulator code from the article and it compiles under MS-DOS with only minor changes, but it has certain compromises regarding the hardware memory addresses and return codes that require it to use a custom RT-11 boot diskette (it has a custom DX.SYS, I’m guessing). 


                I’ve done quite a bit of Googling about the simulator and the author (who worked for the NASD at the time he wrote the article), but haven’t come up with much additional information. Yes, I could easily use SIMH instead, but this is a fun project to work on to keep the mind busy. I guess I have four options: move memory around and see if the default DX.SYS will work; write a custom DX.SYS and make a new image using SIMH (way beyond me); continue to hunt down the author and see if he has any of the original files; give up and just use SIMH.


                If anyone is interested, I can send a PDF of the article. It’s actually a neatly-written program, and the ODT works fine. 





Rich Cini





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