That's a National Semiconductor DP83905 chip. The datasheet [1] says "Software compatible with Novell's NE2000/Plus industry standard", so I'd hazard a guess that it will work with a generic NE2000 packet driver. It's jumperless so there will be a utility to configure its I/O address, but you can probably just try all the possible addresses (0x200, 0x220, 0x240, 0x260, etc.) until you find the one that works.

Most of my old 8-bit ISA network cards have a similar giant DC-DC converter on them, too.

[1] https://media.digikey.com/pdf/Data%20Sheets/T … DFs/DP83905.pdf

Baoran wrote on 2020-10-21, 02:40:

Why would a network card need such big voltage converter chip as this one has? Have not seen such in other network cards.

It's used for the coax port in 10BASE2 (thin) mode.

kdr wrote on 2020-10-21, 04:53:

That's a National Semiconductor DP83905 chip. The datasheet [1] says "Software compatible with Novell's NE2000/Plus industry standard", so I'd hazard a guess that it will work with a generic NE2000 packet driver. It's jumperless so there will be a utility to configure its I/O address, but you can probably just try all the possible addresses (0x200, 0x220, 0x240, 0x260, etc.) until you find the one that works.

Most of my old 8-bit ISA network cards have a similar giant DC-DC converter on them, too.

[1] https://media.digikey.com/pdf/Data%20Sheets/T … DFs/DP83905.pdf

All my other isa network cards are 3com ones and I have not seen such converter in them so that is why I had not seen one before.

Here are NDIS drivers for DOS and autoset application (for DOS I think): ftp://corvus.izmiran.ru/pub/windows/drivers/n … ork/DP83905.zip
No packet driver though. However being NE2000 compatible, you may set up resources using autoset application and use those values with ne2000 packet driver.