I'm wondering about the battery - Does this card have a CMOS on it?

h-a-l-9000 wrote:

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Features of this card:
- Floppy controller (UM8272), guess not suitable for 1.44MB floppies, second crystal missing
- 1 serial port equipped (INS8250 + MC1488 + MC1489 soldered in, non-standard serial ribbon cable)
- option to install a second serial port (empty sockets)
- 1 parallel port (implemented in the ASIC)
- 4-axis game port (NE558)
- battery backed clock (MM58167) - only useful in XT systems, and with a driver
- the video, very likely CGA

it's just a clock 🤣

luckybob wrote:

The converter is a WONDERFUL thing to make. I got lucky and one of my AT keyboards had an AT/XT switch on the underside. So I dont need one. but there are more details here: http://www.vcfed.org/forum/showthread.php?264 … highlight=at2xt

I think there might be some pre-made PCBs available too.

Considering the simplicity of the circuit and the sheer size of XT DIN-5 connectors, I might be able to whip up a little 'inline dongle' similar to the old AT-to-PS2 adapters.