Yes . The Law has not prescribed that the Promissory note should be printed, typed or computerised. For the sake of convenience, the lenders adopt printed type promissory notes readily available in the shops.
A simple promissory note might be for a lump sum repayment on a certain date. For example, let's say you lend your friend $1,000 and he agrees to repay you by December 1st. The full amount is due on that date, and there is no payment schedule involved.