I knew a business doing just that with a zx spectrum. Even with the horrors of deafening chain paper printers and software on audio casettes. They had a CRMish

I knew a business doing just that with a zx spectrum. Even with the horrors of deafening chain paper printers and software on audio casettes. They had a CRMish application written by a student. They could print their own mailings with individualized coupons. Who cares if it takes a noisy hour in a back room to run. Don't underestimate what people did with those things.