Just to add a bit more color to the story (actually never knew the first part), computers weren't actually allowed in the pit. Timber Hill's agreement with the exchange allowed them to put them in their booths next to the pit. Visible to the their traders in the pit was a computer screen with colored boxes that represented their markets on certain options. They were supposed to tell other traders what their colored codes meant, but generally made things up. For more complex trades, they would flash hand signals to their booth and their clerks would check the computer and flash what their markets should be back to them.
Back at that time their was no computerized trading at all. Only paper sheets were actually allowed in the pits.
That is not factual. The very first pit at the CBOE that TH placed personnel was in the S&P 500 upon the relaunch. I was the trader. We did not begin expansion into the equities until after the 1987 crash where we did in fact utilize color coded screens that we eventually were allowed to aim at the crowds. I ran floor ops at the time. For the S&P we had our computers in the crowd and eventually were allowed to 'drive' the quote boards electronically - the first time it was allowed. All before we expanded into individual equities.
Just to correct one last inaccurate statement, we were not 'supposed' to explain the color schemes to others. We volunteered as we wanted everyone to trade with us. There was never an attempt to deceive. That is incorrect.
Best
David