You made me looking up the original Macintosh, turns out not much expansion was allowed
en.wikipedia.org
It had SCSI though, I think? It was beautiful to use IMO.
I trialled for three days in early 1986 (while doing a masters and was told a computer was mandatory) I think what was called a "Fat Mac". It had two floppy drives. I think it also was capable of Excel; it had Word on it I think. There was a Uni special going on at the time. Via the computer science faculty. Those guys were keen on the Apple stuff. At that time, an Apple 5MB SCSI hard disk was $5,000. The computer was around $3,000. It was totally awesome though. I was computer illiterate and I could use it. Amazing. My young wife though - not impressed at all. Get real, your a father now.
I bought a clone from the husband of my best friend's sister. He was a math genius of sorts - but he ended up a gambling addict and their marriage broke up. He was a Chinese Malaysian. I bought a PC with an 8086 with a green and black screen, with a 20MB hard disk. Awesome. Cost me just under $2,000. It weighed heaps. Even back then the keyboard felt cheap compared to the Apple's one. And two very floppy drives. And it had pirated Wordperfect word processor (Microsoft stole their tech and blew them away) and Lotus 123 (Microsoft stole their tech and blew them away), and I got a dot matrix printer too. Lotus spreadsheets and graphs were phenomenal.
Next computer I bought through a Bank I worked at, was an SE30 Mac. Wish I still had that - lovely thing. It had Word and Excel. Back then, you could get Excel to draw a graph, you could copy and paste just that graph into a free Apple Draw program, and you could pull the graph apart, and re-assemble its bits, and type text and arrows. All so easy to do. Back then. Not so easy to do years later though. And when I tell finance people that Excel was invented on the Mac, they think I am crazy. Two years ago I tossed out my Newton which I had used, and its case, but I forgot the password and I stopped using it, I think I got a Blackberry, which felt primitive but it was a phone. The Newton was in brand new condition. Now, they are worth something. Sheesh.