Astrocade was Re: Looking for 8080/Z80 BASIC

One interesting alternative, which I considered for that project, was the 1978 Super Basic for the Bally Astrocade (a Z80 machine, so we are back to the start of this thread) which claimed to be self revealing. It had GOSUB but also allowed you to define your own named functions (it called them macros). These functions used INPUT to read the values supplied as arguments at the call site, but if the argument was missing it would print the associated prompt text and read the value from the keyboard. And all the built in commands worked just like this, so typing in a parcial expression would make the computer print out what additional data it needed. This interpreter was not sold, so a repackaged version of it was developed and sold as the Datamax UV-1 high end machines for video artists and the language was renamed to Zgrass.