Topre is full NKRO, port limited.
They use a nestled hierarchy on the PCB to achieve rollover redundancy throughout the entire board. But most Topres are USB spec-limited to 6 keys + 4 modifiers. There are a few PS/2 variety such as a few older Topres, a few specific modern Topres, and a few special edition Topres such as the notable
45g G-tune 108B-MP.
All Topre boards seem to be 6kro and don't support a ps/2 adapter for NKRO. There are a few that are natively ps/2, and those support NKRO.
Is it backwards as well? PS/2-to-USB or just PS/2 only(for the G-T XrF 108)?