You can use ASSIST09 to load data and code as a hexadecimal loader with these three starting commands:

Dump out a memory range

>D 0000 0100

Display/Edit memory

>M 0000
00-

Simply pick a memory address and start typing in hex codes as 2 digits, and then hit space to go to the next byte

“Go To” an address to start running code:

>G 1000

Return to SST-6809