i guess i can just use my linux machine, but ugh

next question is how do i actually physically interface with these pins. can’t use clips because well, it’s a flat surface, and the spacing is kinda weird so any prebuilt pogo pin things are ruled out

Ok, have a pinout of sorts
Ground Data Data Data Data Clock Half-press 1 Half-press 2 Shutter fired 1 Shutter fired 2 Bat+ Logic voltage

now we check if there are any common data interfaces with 4 data lines of some description and a clock

Is this just fucking SPI with a bonus pin

it would really help if I could non-destructively open up one of the program cards but they are sealed shut completely

i think it looks like a clock at least

in case you are wondering how i got this. i am just holding a pogo pin on the connector by hand

wtf is this though

its clock. but not.

jokes aside. there's two data lines (in/out i guess), one clock, one fucked up clock, and whatever this is

New working pinout:
Ground Fucked up clock Data Data Mystery pin Clock Half-press 1 Half-press 2 Shutter fired 1 Shutter fired 2 Bat+ Logic voltage

If I could make a guess, the mystery pin is probably a chip select

I think I need to come up with a proper test jig, I can't get a consistent reading just holding it on the pins by hand

lmao i killed the camera. rip

ok, it came back to life after reinserting the battery. logic voltage is 3.2v again

ordered some individual pogo pins, I’ll make a test jig with some cardboard and hotglue since I don’t have a 3D printer

That didn't work, so I ripped apart the side door where the card goes and just put some test clips on the card contacts. I'm no closer to understanding anything. Like, if this is SPI, why is there data going on both directions at once on an empty port when CSEL is low. Shouldn't it just be the camera trying to talk to the non-existent card?

I found a bit more information in the Minolta 5xi service manual (which also uses these expansion cards). The cards contain a microcontroller which communicates over whatever protocol this is

It's serial of some description according to the service manual