SEE MY POST FURTHER DOWN ,IT HAS AN UPDATED AND CLEAR TUTORIAL TO FOLLOW AND ALSO UPDATED WITH A NEW WHITE MATCHING CASE
This is a method to get your pc engine/core grafx/core grafx II, to output an scart RGB amplified signal,along with left and right audio(you have the choice of using the audio inside the scart plug or you can use the gold plated red and white audio sockets on the box and hook them to your audio system) ,all this is Without having to do the internal solder method ,or having to send your console off to someone to do it for you.I can make and sell you one of these .
Please note,as you are using the expansion port/connector on the back of the console,you can't use the IFU-30 cd rom rom unit or any other devices which use the expansion port ,at the same time as using the RGB modbox.
Now with braided sleeving and neutrik phono sockets.Updated pics
Finally finished my external rgb mod for the PC engine which plugs into the expansion port ,and is really simple to do with those connectors which are just different versions of the ones you find plugged into your pc's reset/power/hdd led headers.They're nice and thin ,so fit perfectly into the pc engine's expansion port and the holes for the PC engine's exp port pins to fit into are also the exact width apart (2.54mm or.1 inch) and thickness.
There is a few ways of doing this ,like having the connectors come from the exp port and going to a small pcb with the amp and a female scart plug on that ,then the user can just buy a scart lead and plug straight in ,but for simplicity sake i opted to just crimp the terminals to the scart lead ,then those plug into the header sockets and into the exp port and the RGB amp is inside the scart plug .
Sorry about the huge list of imageshack links ,but with over 90 pictures
Maybe someone could tidy this up( and add a picture of the exp port and what wires i have connected to what pins) into some kind of easy to follow order and stick it on the wiki ?
Connections used in my pictures
comp sync =yellow
Right audio =purple wire
Left audio = white wire
RGB amp inside the scart plug ,can use the 3 Q's (transistor) method for simplicity ,found on http://www.mmmonkey.co.uk/console/pce/amp.htm
There's also a 95% finished version of the plugable RGB mod which works with the cd rom rom connected in the briefcace .
These mods are mainly for people who don't want to open up their consoles and poke around with a soldering iron when they're not competent using one or don't want to send their console to someone to internally rgb mod it for them.I'll just stick to the internal mod and amp (are there any games that would benefit from each person having a seperate tv screen ,as you can use both mods ,one showing on each tv screen at the same time).
Once i'm done i'm just going to give these finished cables away .