It certainly made me want to learn assembly, but I didn't have access to the Programmer's Reference Guide or any other useful resources for assembly programming

It certainly made me want to learn assembly, but I didn't have access to the Programmer's Reference Guide or any other useful resources for assembly programming, let alone an assembler cart. At the same time, my school had a room full of Amstrad CPC 6128 computers with a very rich BASIC dialect that was good enough for making decent games. I'm very fond of that machine, but they're extremely hard to come by now, as are the 3 inch disks.