hagbard said:
You don't need a hacked (an old) emulator to play kof99. I recommend you to try newer emus like latest mame32, kawaks or nebula.
To help you we need to know which roms you have (or which are missing), but better from an updated emulator, because the romset may have changed, or perhaps you got an updated one. Then make an audit an post here the kof99 related info (the lines begining with kof99 and so on)
I haven't been on Kaillera in a LONG time, and last time I checked everyone went with MAME 32k .64
Here's my list from .64
kof99: 251-sma.bin 262144 bytes
kof99: 251-p1.bin 4194304 bytes
kof99: 251-p2.bin 4194304 bytes
kof99: ng-sfix.rom 131072 bytes
kof99: neo-geo.rom 131072 bytes
kof99: ng-sm1.rom 131072 bytes
kof99: 251-m1.bin 131072 bytes
kof99: ng-lo.rom 65536 bytes
kof99: 251-v1.bin 4194304 bytes
kof99: 251-v2.bin 4194304 bytes
kof99: 251-v3.bin 4194304 bytes
kof99: 251-v4.bin 2097152 bytes
kof99: 251-c1.bin 8388608 bytes
kof99: 251-c2.bin 8388608 bytes
kof99: 251-c3.bin 8388608 bytes
kof99: 251-c4.bin 8388608 bytes
kof99: 251-c5.bin 8388608 bytes
kof99: 251-c6.bin 8388608 bytes
kof99: 251-c7.bin 8388608 bytes
kof99: 251-c8.bin 8388608 bytes
I'm not sure if you can give rom links here, but if needed PM me so I can tell you where I got the rom from (I'm sure the rom is complete though)