ZX-81 in 1981. My parents bought it for me, with a wobbly 16KB rampack too. Top stuff. Taught myself to program in Sinclair BASIC by typing in programs from magazines and tracking down the mistakes I'd made. Apart from the mistake of pressing slightly too hard on the "keyboard" (which had no keys - it was a solid surface with no feedback), which caused the rampack precariously plugged into the back to wobble and thus crash the computer. There was nothing to be done about that mistake.
First PC was a second hand 386 in the late 1980s IIRC. 1MB of memory (a whole megabtye!), 2 5.25" FDD and a 40MB MFM HDD about the size of a couple of bricks.
I've never used a handheld computer. I would have been all over one when I was a boy. Proper Star Trek stuff. But I was relatively old when they came out and so tiny screens coated in a rotting slurry of organic material and constantly running out of charge didn't seem like a particularly fun toy to me then and not worth being constantly monitored like some sort of criminal with an ankle bracelet.