Another #Atari computer in my collection: a PC3, an 8088/MSDOS based computer!
@AndresPlazaR Lovely bit of kit.
5.25" floppy? DOS 3.1?
Waves of nostalgia for days long gone.
@smy Yes! It has even a hard disk. 
Not sure about the MSDOS version, I need to double check.
@AndresPlazaR A hard drive!! I remember the first family Amstrad had a 20MB hard-card as an add-on.
I think you might be earlier than DOS3 thinking about it if you're an 8088?
An interesting piece of history and I hope it lasts many more years.
@smy I checked with another monitor (EGA) and the image looks fine, so it is definitely my monitor and not the video card. But I don't understand much of CRTs, so it will be a slow/painful process.
@AndresPlazaR What a thing of absolute beauty! I preferred the 'orange' to the green VDUs.
A long time since I've seen that boot screen.
Got a spare old analogue monitor to test with? Anything with the VGA connector? Is it older than that? Thanks for sharing!