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The access cover on the shock tower side, you will have to remove the ECM & then you'll see the access cover. Can't tell you for sure but the mem-cal will  could very well be the AUMY, pull the ecm, remove the cover & you'll see for sure.    

Thank you  for pointing me to the correct location. I found the ECM under the passenger-side strut tower. I uploaded three photos of it. The only label I can see is the Delphi remanufactured sticker (SVC #16198260). I don't see an obvious inspection cover or small access panel for the MEM-CAL. Before I start removing mounting bolts or unplugging connectors, can you tell me exactly which fasteners need to come off to access the MEM-CAL and read the original GM ECM service number? I don't want to damage anything or take apart more than necessary.

Thanks, that's exactly the information I was looking for. I haven't physically verified my ECM yet. I'll check the passenger-side shock tower under the hood and report back with the ECM service number and MEM-CAL ID. Since my car is a 1990 Cutlass Supreme 3.1 LH0 with an automatic, can you tell me which stock MEM-CAL ID I should expect to find?

You understand that because you're dealing OBD1 the ECM mem cal's are tuned to the specific vehicle powertrain the mem-cal is plugged into for particular vehicles ECM. If one is attempting to do custom chip mods you can't just use a program such as TunerPro to alter the mem-cal, you have to burn a new eeprom blank chip (27C256) to fit into the chip housing that plugs into the mem-cal slot.  To burn the chip you will need the physical Moates chip burner, a laptop with the Moates software on it to read the existing mem-cal, extract that BIn file, then you have to write the new BIN program with the Moates software & then command the burn of the new blank chip. To be honest one usually doesn't get it right the 1st time. Here is the list of GM OBD1 ECMs & the accompanying MEM-CAL ID's. Yours will the 1227727. Your engine code is *T*,  the mem-cal will be for either auto or man trans. Your mem-cal has a sticker attached to the mem-cal, pull the ECM inspection cover, the mem-cal is right below the cover for easy access. The ECM is easy to recognize, open the hood, in front of right side shock tower under the plastic cover, bolted to the shock tower. https://pcmhacking.net/ludis/p4xref.html#1227727

Thanks. I should have worded that better. The 1227730 is not confirmed. I only listed it because I found TunerPro definitions that referenced the 1227727/1227730 family. I haven't physically verified the ECM service number yet. Before I pull the ECM, can someone confirm the factory ECM service number and MEM-CAL for a stock 1990 Cutlass Supreme 3.1 LH0 W-body? Also If the factory ECM is 1227727, which TunerPro ADX and XDF are you using for a stock 1990 LH0?