CNet has a series of pics that show disassembly of a Tandy TRS-80
My first real computer was a Tandy Color Computer 2, which is pretty much just a cost reduced version of the TRS-80 with a slightly different ROM. My father bought it for me for Christmas when I was eight.
No hard disk. No floppy drive. The only secondary storage I could use to save my BASIC programs was a $12.00 cable you could buy to hook it to a cassette recorder. Radio Shack sold dedicated cassette recorders specifically for the purpose, but my old radio/tape player worked well enough.
That little computer held me over for quite a few years until I got my Apple IIc.