One thing that I never seem to get better at is identifying the size of old SIMMs and DIPs. I found a page on archive.org that gives the size by manufacturer and by device. Maybe it will help you figure out whether that 30-pin SIMM is 1MB or 4MB.

http://web.archive.org/web/19990117032355/htt … arts/06main.htm

Also, this page is very helpful in general.

http://www.pcguide.com/ref/ram/packSize-c.html