A few times each year market price corrects and a horific price drop occurs. Sometimes 200 to 500 point drops happen in just one or two days. I like the idea of buying the market after the drops. Writing the dates down when the market drops isn't working for me. How do I scan for these histoical drops?

TC2000 does not have backtesting built in. You could create a Condition Formula for price dropping by at least 200 points:

C <= C1 - 200

Or if you want to check for two bars instead of one:

C <= C2 - 200

And if it returns true for the current bar for the DJ-30 symbol (I'm assuming you are using the Dow Jones Industrial Average, but you could choose another index), you could have this indicated in a WatchList Column or the symbol would would appear in an EasyScan containing this Condition Formula as an EasyScan Condition.

You could also use the formula as the Boolean Formula in a Custom PCF % True Indicator and there would be a spike on the chart for every date in which the Condition Formula was true for the symbol you are viewing. If the active symbol on the chart is displaying the symbol for the index of interest, there would be a spike on the chart for the bars in which the Net Change from one bar to the next was negative two hundred.

Keep in mind that the chart in TC2000 version 12.1 is limited to 500-bars. So you can display about two years of data on a Daily chart.