If I didn't know any better I'd say that the first one is a CGA card, the second one is indeed an I/O board, and the third one I have no idea about.

Edit: also, welcome to the forum! And your English isn't bad at all.

First one could be a SDLC adapter card.

Second some IO-controller, But no ISA.... But I See a Zillog Z08530 (serial port), a WD37C65C (a NEC Floppy controller), so it's some kind of IO. Unfortunately the picture does not show the numbers on the right. And a picture from the other side would also be cool.

And the third refers to an Siemens Computer according to the numbers on the card. At least there is a battery on it and some Ram 8 NEC D4464C-15L. And according to google it is 192 x 8 Bit static CMOS Ram. So some kind of BIOS card, strange is that is not on the mainboard.

Thanks for your replies
Unfortunately, google give me no information about this cards.
Anyway I think these come from very old computers.

For Roman78: here's the back of the 2nd card (I/O controller?!?)

If anyone has the same cards pls let me know.

Thanks again

Presumably, some kind of proprietary ribbon cable was used to attach that I/O card to some specific motherboard.

Without both the ribbon cable and the specific motherboard, there's really no point in keeping it around.

The last card contains a battery and ram.. Perhaps that's a ram disk for a proprietary machinery ?

1) SDLC adapter

2) Not a PC ISA card. Not PC stuff maybe. I'd say it is mainboard of a laser printer or something, but the floppy controller would not make sense.

3) 64 kilobytes of SRAM with battery back-up. So of course this is not CMOS RAM for BIOS, and quite small for a RAM disk. It could however be used to back up some code or data during power outages, so a system (a factory) can continue from where it was. Or maybe it is a ROM emulator for developing bootable BIOSes, who knows.

the #2 is from a test system or data aquisition system. i dont see any common marks from its age (racal dana, keithley, bk, hp etc)

Note: This should be in Marvin.

Thanks for the info guys
I have very old stuff at home, 386/486/Pentium motherboards, AMD/Intel CPU , ISA & PCI cards (audio, video, printer, serial, controllers), hdd's MFM, and more, but these 3 cards will remain unknown....so I will use them as spare parts. 😉

Morris69 wrote:

Well, i have three ISA cards that I do not know what they are (video card?, RAM expansion?)
Can you help me?

I think:

1. SDLC adapter
2. data acquisition system
3. SRAM