The CPU was a Z80, that must have been RAM. http://www.s100computers.com/Hardware%20Folder/Vector%20Grap...
The arrival of the IBM PC (and PC-DOS/MS-DOS) in 1981 was an extinction-level event for the CP/M-based, mostly-Z80-based, 8-bit business microcomputer industry. Vector did not weather it.
Downside of how much tech has changed is stuff gets missed in a copy edit because the numbers sound so silly (to modern ears) they assume I haven't screwed up a typo or find/replace.
I'll flag it.