grounding issue

[icabjeff]

I'm connecting my multiti programer to an X-Arcade game control with a proto board. The X-Arcade acts as a keyboard and uses a matrix that places switches in groups of four for output. So, the X-Arcade requires a separate ground for every group. I need to separate the two 9pin d-subs on the proto board into four d-subs with 5 pins each. How do I get four separate grounds for my switches with only two grounds from the multiti programer? I'll be doing J2 through J5 in the diagram below.

Thanks, Jeff

BYO_Advanced_Inst.gif (38.93 KiB) Viewed 3298 times

[Benj]

Hello Jeff

Can you not just link all of the ground signals together.