I just bought one of these and then realized the 10+ year old linksys router I wanted to reverse engineer uses an 80 mhz SPI bus, which is too fast for the entry level Salaea. Nice hardware if it works for your use case though.
If it's really 80M, DS1104Z is still not fast enough. Maybe something with like 350M BW is required.
Also note that many modern scopes have software bandwidth limitation, and many of them are hackable. Rigol and Siglent are famous for making their scopes trivially hackable, that's a marketing point, but some Tek and Keysight's also.
The DS1104Z has a MSO option: if you add the RPL1116 logic probes, you can sample 8 channels at 1GSa/s, or 16 ch at 500MSa/s. That should be easily capable of capturing 80MHz SPI.
The downside to using a scope is it's much clunkier than using a LA on a PC. The decoder option it will give you the data, but if you're doing more than a handful of bytes, it gets tedious to scroll through hex dumps on screen and manually copying out the parts you want.
Saleae's software is delightful for this on their hardware. However, Sigrok is a decent alternative which supports a lot of devices. That includes the DS1000Z series, though I don't know if that includes the logic inputs. The OP might want to check them out.
