In order to make Emplant card to work under A4000 I'll definetely need 2 pairs of those ROMs. Below is taken from the manual.
Apple 256K MAC II/IIx/IIcx/SE-30 ROMs with high density drive (known as a 'SuperDrive' in the Macintosh world). These come as four twenty-eight pin chips, or as a ROM-SIMM board.
There are two known versions of the DIP packaged ROMs.
The older style can just be plugged into the Emplant hardware and dumped normally.
The newer style (512K ROMs with only 256K of code burned into them) require an adapter socket and special hardware to dump them. These ROMs are easily identified by having 'T1000' as part of the part number.