Thinking back, maybe the first useful program I ever wrote was on a printing calculator that could remember a sequence of operations -- maybe up to 64? -- but h

Thinking back, maybe the first useful program I ever wrote was on a printing calculator that could remember a sequence of operations -- maybe up to 64? -- but had no branch instructions. You would push "go" each time it stopped, kachunk kachunk kachunk..., until it finished. The program figured loan interest payments. (Printing calculators used to be loud.)