@elkmovie @provuejim As I recall, our publisher, Personal Software, recommended the Apple first, because floppy drives were more available for it, he told us. We already had access to good tools for the 6502 chip, which Bob knew well, so that was OK. So Jobs was right to point out disks in his interview (see info about 0:55 in http://bricklin.com/tedxtalk.htm ).
@danb @elkmovie I found a full transcript of Steve Job’s interview.
https://www.anawab.com/steve-jobs-lost-interview-1990/
I remember seeing this interview in a theater in the 90’s. That particular paragraph of the interview is very odd - he talks about disk drives, then mentions 48k, which is clearly RAM. Anyway, he claims that Apple “had a low cost floppy disk drive that really worked about two to three years before any of our competitors.” I guess it depends on what “competitors” are. Certainly companies like Processor Technology and Northstar had drives before Apple did, in fact this article mentions that Steve Wozniak examined the Northstar design before designing the Apple II disk.
https://www.apple2history.org/history/ah05/
Certainly Apple had a floppy earlier than Radio Shack and Commodore, but there were definitely other companies that did have disk drives, and just as much RAM. At the time (1977-78) I worked on these computers as a tech at the Byte Shop.
@provuejim @elkmovie As I recall, there were 8" and 5 1/4" floppy drives. We are talking about 5 1/4". Supporting them was one thing, being able to ship lots of them was another. I remember hearing (but I can't confirm) that Apple had locked up excess production from Shugart Assoc, the main manufacturer, so TRS-80, etc., users couldn't find them in stock for many months once they became popular. In any case, they were more prevalent to Apple II's.
CP/M would be much worse than Apple/TRS80/Pet because no standard memory-mapped screen, which VisiCalc needed for the multi-window, scrolling display. I had lots of experience with that on the DEC video displays (I had influence on).
@danb @elkmovie Yes, many CP/M computers were attached to external CRT terminals. Though by 1978, the external terminals were XY addressible, so it was possible to write visual applications like VisiCalc. I know that for sure because I wrote a visual editor for CP/M that I sold thru Lifeboat Associates. In fact I had a booth at the 4th West Coast Computer Faire in May 1979, according to Wikipedia you demonstrated VisiCalc there. So I guess we were in the same room at that time! I did sell PolyVUE on 8” floppies, not 5 1/4”. But it definitely was easier to write visual software for a memory mapped display. In fact my IMSAI computer had a memory mapped VDM-1 card that I originally used to write PolyVUE, then I adapted it to work with external CRTs so it could be sold. (The VDM card was designed by Lee Felsenstein, later famous for the Osbourne.) There was a pretty decent market for CP/M software, with many other apps like WordStar, dBase, etc.