Vetronix/Mastertech cartridge -cross over help pic inside
 

I found a complete "depending on the answers here" a Mastertech 3100 with all the cables and adapters I need. It doesnt say mass storage cartridge on the main cartridge but rather "Reprogrammable High Capacity cartridge" . It is not local so I am dealing over the phone, the closed shop owner says this is the mass storage cartridge. Question is does anyone know if this is the same as the Vetronix cartridge and will it work in a Tech1a?