Please try to make pictures straight. Can't read what is written near the boot-rom socket because your picture is taken on angle...

Sorry I missed that. Here is a better picture.

Its an Acer 5220. (not related to the 5220 extensa/netbook etc). There are netware drivers but I dont know if there is a dos packet driver or win95 drivers.

its using the DP8390D network ic driver chip, its a very common driver chip in old designs, often compatible with NE1000/NE2000 card designs, 3C503...

I would try NE2000 drivers first if you cant find original Acer 5220 ones

Too bad it only shows notebook related drivers for Windows and not this card. I tried googling every possible label on the card but no result aside from a russian site claiming this card is from a computer named ACER MPF-PC/710 (PC/710 IIM).

NE2000 compatible didn't work but I'll try NE1000.

yeah they 'reused' the 5220 number and it screws up searched. Ther are novell netware drivers but pcmag said there was not other kinds provided with the card. It definitely looks like they just re-arranged the reference design from the NE1k/DP8390D sheets.

did you set correct jumpers for IO port, IRQ etc?

To be honest I don't really know how to set the correct parameters on the card without a manual. There is a DIP switch too and I have no idea what it does.

dma is not set?

Miphee wrote:

NE2000 compatible didn't work but I'll try NE1000.

NE2000 is 16-bit, so that card can't be compatible.
But it's safe bet it's compatible with NE1000.

Miphee wrote:

To be honest I don't really know how to set the correct parameters on the card without a manual. There is a DIP switch too and I have no idea what it does.

INT DMA A?
Close one DMA.

Grzyb wrote:

Miphee wrote:

NE2000 compatible didn't work but I'll try NE1000.

NE2000 is 16-bit, so that card can't be compatible.
But it's safe bet it's compatible with NE1000.

Indeed, its 8-bit and NE1000.

Dont mess with windows, try the DOS drivers first. You should be able to hand over IO, IRQ and DMA via a command line parameter. Try all IO-Adresses from 0x160 to 0x300 , IRQ and DMA doesnt matter in the 1st step. If the card is detected, you have the correct IO. Otherwise you will get an error message.

Thank you for all your help but I don't think I will be able to find the correct setup without knowing the current configuration of the card. I believe that the DIP switch combination sets the IRQ/DMA/IO and without a manual I'm just shooting blind.
I tried 59 combinations so far and none worked.

Acer 5220 hardware setting quick reference:

a. Bit-Mapped Options for DIP Switchblock SW1

1 Switch                                   Default
2   Number       Function                    Setting
3   -------------------------------------------------
4     01     Memory segment address A17         1
5     02     Memory segment address A16         1
6     03     Memory segment address A15         0
7     04     Memory segment address A14         0
8     05     Memory segment address A13         0
9     06     I/O base address A09               1
10     07     I/O base address A08               0
11     08     I/O base address A07               0
12     09     I/O base address A06               1
13     10     I/O base address A05               1

Default settings are I/O base address 260h and disable PROM memory segment
address.

b. Interrupt request channel jumper setting

Set the shorting plug in the proper position when the desired interrupt
channel is selected.

1  Jumper Number        Interrupt Channel
2    --------------------------------------------
3      JP10                IRQ2 (default setting)
4      JP11                IRQ3
5      JP12                IRQ4
6      JP13                IRQ5
7      JP14                IRQ6
8      JP15                IRQ7

Configuring the LAN Adapter

Follow the steps and, if necessary, refer to Acer 5220
Ethernet Card User's Manual Chapter 4 for easy installation.

1. Verify the SW1 setting for I/O and memory base address
configuration.If the memory is not used, set SW1-1 and SW1-2 to ON.
2. If the memory space is used, set jumper group 2 (J08 - J09)
to the proper configuration.
3. Set the jumper plug to the proper jumper position on the
interrupt channel configuration block J10 - J15.
4. Check the network interface used in the network system If thick
Ethernet is used, close all group 1 jumpers J00 - J07 in THICK
position. If thin Ethernet is used, close all group 1 jumpers in
THIN position.
5. Set J22 jumper to the proper position for selecting Advanced mode
or NE-1000 compatible mode.

After a lot of trying the card was finally recognized as NE1000 compatible just to be "lost" again after restart.
It was sometimes detected and sometimes not at all so I consider it faulty.
I have another card that needs identifying. Thank you.

5250 twinaxial... thats what the smc chip is. and thats a 6p6c (rj12?) jack, not rj45.. so not a normal network card.

might be a 5250 express adapter or 5250 emulator?

So it can't really be used in a standard PC. Thanks for the info.

Wiki:
"Emulators for block-oriented terminals, primarily IBM 3270, but also IBM 5250 and other non-IBM terminals.
Coax/Twinax connected
These terminal emulators are used to replace terminals attached to a host or terminal controller via a coaxial cable (coax) or twinaxial cabling (twinax). They require that the computer on which they run have a hardware adapter to support such an attachment."