Missing toshiba HX-F101 cartridge, reverse engineering schematics for it?

Now I tried to boot SVI728 and Sony Hitbit-75P with this cartridge only (no cable connected to external unit). The boot hangs in both machines in start screen:

I used 27C256 rom filled with original disk rom copied twice. pin A14 is connected to +5V via 10K ohm resistor.

Yes, with drive unit also connected, the floppy now seems to work with this cartridge design.

Now the problem is where to get the 34 pin round cable? Or would 18 pins be enough?

But are those ebay cables one to one mapping, or those 10,12,14,16 pins swapped? As i need cable that is not swapped.

I think i will try to make the cable from scsi cable.