I see in the source code networking cards group various drivers but not rtl8139 one. Is there a reason? Are there menuet drivers that don't appear in the drivers source directory?

There is a driver and sources for RTL8169, but not for RTL8139.

Do you mean that menuet64 lacks a driver for rtl8139? If so, why? Is it too old? Menuet32 has one, I also had contributed to it ...

I decided to play safe and not include any GPL drivers for M64, altough there probably arent any legal obstacles. But RTL8139 doesn't seem that complicated, so if somebody wants to write the driver, I'll include it to the release.

https://opensource.stackexchange.com/questions/8741/use-of-gpl-licensed-driver-in-commercial-project