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Sadly, the old thread was lost. https://68kmla.org/forums/index.php?/topic/21280-se40-grayscale-need-help-with-a-carrera-hack/ So, I've gathered some information here to start anew. I have attached v2 of the previously posted hacked control panel. It is untested. CarreraSE40_v2.sit I have also toned out the adapter card, here are the results: All signaling from the PDS30 to the PDS passthrough slot are 1:1 All signaling from the PDS30 to the CACHE slot are 1:1 as well, with these exceptions: CACHE A32 [/ROMOE] is n.c. CACHE B23 [n.c.] is connected to PDS30 B01 [C40M] CACHE B36 [CPUDIS] is n.c. CACHE B40 [CACHE] is n.c. CACHE C05 [/CFLUSH] is n.c. CACHE C07 [n.c.] is connected to PDS30 A01 [/RBV] CACHE C13 [/CENABLE] is n.c. CACHE C17 [n.c.] is connected to A02 [/FPU] CACHE C20 [n.c.] is n.c. Interesting that some signals are ran over the n.c. pins. Finally, I have included some photos of my set for reference.