Which MEMCALs have removable proms?

**EDZIP** · 09-09-2021

Do any of the GM OEM OBD1 MEMCALs have removable proms or are they all permanently attached?

**NomakeWan** · 09-09-2021

All MEMCALs have permanently-affixed chips; the main PROM, the backup PROM, and the knock filter.

The only ECM that comes to mind with a removable chip is the one in the '85 Corvette, the 1226870. But that's not a MEMCAL, so yeah.

**EDZIP** · 09-09-2021

Originally Posted by NomakeWan

All MEMCALs have permanently-affixed chips; the main PROM, the backup PROM, and the knock filter.

The only ECM that comes to mind with a removable chip is the one in the '85 Corvette, the 1226870. But that's not a MEMCAL, so yeah.

Thanks...only asked because I swear I had one years ago...old age setting in! Did convert an extra MEMCAL last week with a ZIP socket...it's in a car right now.