I've been trying to put my old BBS back up, and I get this (these) error(s) and I cannot find anything about INT14 errors. I would admit my search-fu isn't that great, but maybe someone here can point to the right direction for a fix.. I would post PC specs, but the same outcome is on multiple PC's. I have had COM1 thru 4 set to every possible switch, same outcome.
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DOS_AllocateMemory(blocks=0x000a) = 0x0171-0x017a
DOS_AllocateMemory(blocks=0x9e83) = 0x017c-0x9ffe
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
DOS_AllocateMemory(blocks=0x000a) = 0x2978-0x2981
DOS_AllocateMemory(blocks=0x767c) = 0x2983-0x9ffe
DOS_AllocateMemory(blocks=0x000a) = 0x29c4-0x29cd
DOS_AllocateMemory(blocks=0x7630) = 0x29cf-0x9ffe
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH=13 DX= d51
BIOS INT14: Unhandled call AH= 4 DX= 0

After this I get booted back to the DOS prompt.