I don't know about a COMPAQ SLT/256 but I have a program for a COMPAQ SLT/286.Hello I recently Acquired a Free Compaq SLT /256 I Repaired The Keyboard cord and I turned it on and it says
162-System Options Not Set-(Run Setup)
Insert DIAGNOSTIC diskette in Drive A:
(Resume = "F1" Key)
His battery might not need replacement, yet. He'll have to set it up to determine that for sure. BTW I have version 8.00 of the setup/diagnostics program.This is a very common issue on the SLT286, I'm in the process of fixing it on mine as well. I highly recommend you take a look at this article if you'd like to boot up your computer without having to insert the diagnostic disk every time. I have a User Diagnostics 6.13 disk that works fine on my SLT286, PM me if you want me to dump it and send you the image file. Hope this helps.