@Jebi1717
Sadly, for the most part the +2A/B cannot be modified / upgraded to work with a Floppy Disk Drive. However, there are some
VERY RARE +2A's with a +3 motherboard with the FDD circuitry removed - it is possible to replace the circuitry and it will work - if you can find the Zilog FDD controller.
Although saying this, these butchered +3 motherboards are extremely uncommon, I know of only 1 person whom has them - these particular motherboards were mostly released in Spain, so finding them on this side of the water is doubly rare, but my friend, you have the luck of the Irish on your side
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The Z80 IDE is compatible with all ranges of Spectrum, depending on what version you of Spectrum you have determines the complexity of getting it to work.
The Spectrum +2A/B and +3 are very simple and only need ROM change, where as the earlier 48k/48k+ require desoldering of the CPU and ROM (and some 128k Toast Racks)... the 128k +2 is perhaps the second easiest, with subtle modification to the CF-IDE adapter and ROM.
I hope to be doing another production of these boards soon, but with some subtle differences - but first I will be updating and writing windows software for people to add data to and from their 8bit IDE devices easily.