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[Immortalhate666]

Ok i have a orginal mk4 arcade cab with a crt in it arcade monitor,i wanna do the mame thing also..and go back n forth to orginal arcade and mame.

1.what do i need to buy to complete it
2.whats the best ati to buy gpu to use to flashed for drivers
3.do i need a j-pac?
4.how do i connect my arcade cab controls to it to play the games?
 Thanks..

[abispac]

#1 use google, thats has been answered way to many times.
#2 Im not sure, but the card does not need to be flashed, just using emudrivers would do the trick.
#3 does mk4 uses jamma? if so, yes....
#4 aaaaaaaa jpac?

[buttersoft]

A Jpac gives you a PC + arcade controls on one side, feeding to a jamma edge connector. Getting a jamma 2-to-1 switch module would then let you change between MK and your PC.

BUT it might not let you feed the same controls through. I hadn't thought of that point before, but there must be a way around that.

Any AMD GPU from the Radeon HD5000 series up to the Radeon R9 380 will work. Something like an R9 360 is nice, IMO. But even a Radeon HD 5450 will work fine.

[flybynight]

Not sure about jpac nowadays as it has no audio amp. Probably the JammASD is better as it takes the12v from the jamma edge to power the on-board amp.

These devices only cover buttons 1-3 for each player.  To get all your MK buttons 4-6 you can buy a pin header and solder wires to screw into the terminals on the JammaASD (or jpac). Plug the kick harness into that.

There might be someone selling a midway male kick harness online you could buy.

Then to switch back to PCB from the PC all you have to do is
a) unplug the jpac from the jamma harness and plug in the PCB
b) unplug the kick harness from your adapter and plug itinto the PCB

[punkfungus]

I did it for my SF2CE and MAME cabinet with an IPAC2 and signal relays.
You have to use relay to switch from the IPAC and JAMMA for all your use buttons and controls.
When the PC/MAME is OFF the JAMMA is running when the PC/MAME is ON it switch to the IPAC2.

I also use signal relay for the video(RGBS) and audio with an external AMP to switch from MAME to JAMMA.
I cut the power of the JAMMA board with a relay when MAME is on.

It takes lot of wiring but it work very well. I tried to upload photos but it failed 

I think you can plug your buttons in parallel (IPAC+JAMMA) if you don't cut the power of the JAMMA.
I didn't go with this option because I don't want my JAMMA to be running while MAME is on, I want to preserve the SFC2CE board.

Good luck with your project.