"ERROR 200. Div. by zero"
This is what I get when I run my old BP 7.0 programs.
How can I get past it?
I still have the sourcecode.

Read before Write!  You get the answers more quickly that way!!
Pascal Start-Up Error 200 on fast PCs when using the Crt unit is a VFAQ!

Read the many earlier postings in the comp.lang.pascal.borland (Frank H, Roger
D, Pedt S, Osmo R, ...) and borland.public.turbopascal newsgroups (you could
use DejaNews?), including the comp.lang.pascal.borland mini-FAQ; and Prof.
Salmi's FAQ  ftp://garbo.uwasa.fi/pc/link/tsfaqp.zip #124, and/or Ing.
Franz Glaser's http://www.geocities.com/SiliconValley/2926/tp.html and my
http://www.merlyn.demon.co.uk/  clpb-faq.txt  pas-time.htm  pas-r200.htm .
Install Pedt Scragg's Crt unit; or run Andreas Bauer's TPPATCH on your EXE
(beware early c't EXE-patches). Other fixes are to avoid all use of the Crt
unit; or, if accurate Delay is not needed, to compile with TP5 or TP6.