I find these handy for troubleshooting logic.Connect anode of LED to 74LS48 to pins 9 to 15 one at a time. Should light each time.
If not check the output voltage with DMM or scope.
These are from the mid 70's. I started using them as a tech and still use them occasionally. HP introduced a set of replacements that will only support TTL/DTL. The set shown supports TTL and CMOS.
With the "pack clips" at the bottom of the picture, you can see all signals on up to a 16 pin DIP. Clip automatically picks power and ground from appropriate pins. They show up on eBay from time to time...