Hello,
you need the Haas number from the Main Processor board for more informations. There are different boards in the machines.
look on the inside of the cabinet door. Maybe you see a paper with the numbers of the Pcb's.
Or call your HFO with the serial number of the machine. They can give you the information about the board witch is inside the machine.
The files are stored in the BBU from the Processor board. There are different sizes on the different boards.
press and hold the "program/conversation" button while power on the machine and you can see wich sizes of BBU and Flash memory are on your machine.
But I think that is no IDE connector on your machine. Maybe you must change the PCB for more BBU ( not cheap).
Why you don't use the RS-232?
(sorry for my bad english)
The most dangerous phrase in the language is:"we've always done it this way."