A zx spectrum made by Amstrad which suffered from all the problems of amstrad queezing their DOS into the ROM causing it to crash all the time, but without the disk drive it was there to support.

Not only that but Amstrad never managed to make the disk interface that would allow you to add an external disk drive to it.

I did hear from someone that you could stick an Amiga disk drive onto the expansion port without too much modification though.