Okay, this one is for @Tijn

Sharp MZ-731. I think this computer was originally meant for small businesses mostly. It's graphics capabilities are essentially non-existent: It doesn't have any graphics video modes, just text modes, but surprisingly 512 characters to choose from.

The 731 is the second highest model from the range. It featured a built-in tape recorder and plotter.

There's a 780 model, which has all that and more.

#retrocomputing

From the images in the previous post you couldn't tell it, but this computer was in an absolutely pathetic state when I got it. The ebay auction listed it as not working, but what I really got was quite something.

It looks like the entire machine was submerged in a swamp for years.

There's some sort of sludge residue and rust everywhere.

The CPU is covered entirely in rust.

As far as I can tell from the schematics, there is only a single custom chip, everything else if off-the-shelf stuff and therefore easy to replace.

But if this one logic chip is dead, then I can probably just trash the machine.

I haven't done anything but cleaning and disassembling everything. That was almost five years ago. I've bought better tools in the meantime, so I think I finally have everything I need to get working on this machine again.