Linux on a cash register

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I slid the little PC out the back and then took the cover off. The case is like 16 gauge steel. Seriously, it's thicker metal than that of my gun safe. I figured they did that for additional security or RF shielding or both.

On the left you can see the 8GB Seagate HDD. The black part of the disk is this weird rubber sleeve. Lower left is the PSU. I couldn't find out how much juice it has. The model number is a long string that Google didn't find anything for, and I can't find a manufacturer's name on the sticker. I'm guessing it can't be more than 120 watts, though. I was intending to hook up a CD-ROM in order to do an install, but I may not be able to.

On the right is the other half of the motherboard. Eventually, I'll take the disk and PSU out so I can see the whole thing, but for now, I want to get an OS on it. At the top are 4 RAM slots. It takes 72-pin SIMMs. In there now is the 4MB stick. It's going away. Below that you can see the ALi chipset and the CPU fan. At the right/bottom are expansion slots. It has a shared slot with for ISA/PCI cards, and one dedicated PCI slot. Buried in there are the IDE and floppy controllers. It has one IDE device and a single-ended IDE cable, but the controller is a normal dual channel one and can support the standard four IDE devices. Not enough power, though, and probably not enough ventilation.