ironing out the bugs in my kernel--need make few functions-dont know how they work
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printf and all the things it calls directly or indirectly adds up to a lot of library routines.
From your other threads, I got the idea you were linking without standard libraries. Where are all those library functions coming from? If you let the (Turbo C) library functions into your link, it will be quite a bit of effort to catch and correct all the things that depend on DOS. If you don't, then the likely bugs are in the replacements you've coded for those library routines. Either way, posting your top level code is nearly useless.
Also, where did you get vsprintf.c? Is it a copy compatible with your 16 bit environment? Including a .c file in another .c file sometimes causes problems. I think you said you were using .cpp. Including a .c file in a .cpp is even more likely to cause problems.