Where to find Hewlett Packard Historical Unadjusted Stock Prices

[syoung123]

Hello, I acquired some old Hewlett Packard (it is HP Inc now) stocks in 1979 and 1980 and I am trying to determine the cost basis of these stocks.  I no longer have the records of what I paid for these stocks, and over time, the stock split 2-1 five times, and HP also spun-off of some of its divisions to new companies.  When I googled web sites such as HP Inc, Yahoo Finance, WSJ, Schwab, Merrill, NASDAQ, and the HP Inc stock administrator, they all show adjusted prices.  Is there a web site or some way that I can find the historical unadjusted prices back in 1979 and 1980, or calculate the unadjusted prices?  Thank you.  

[ee-ea]

https://bigcharts.marketwatch.com/historical/default.asp?symb=msft&closeDate=5%2F02%2F22&x=55&y=26

[syoung123]

Thank you for the link.  The symbol is either "HPQ" or "HWP" (old) for Hewlett Packard (Inc).  The link is useful, however, the data does not seem to go as far back to July 1979 - 1980.  It seems to stop around early November 1984.