8080 Assembler-Text Editor (ATE)

[woodelf]

Holger Veit wrote:

> I know of a least one software (which I had disassembled myself for 
> curiosity long ago) that actually uses undocumented Z80 instructions, 
> namely the ones that allow access to the higher and lower haves of the 
> index registers: this is the 12K-Zapple-Basic by TDL. Concerning these 
> instructions, they seem to work on most common Z80s, including Z80A, B, 
> and H variants, tried those myself. I haven't verified, due to lack of 
> HW, where they also work on the 64180, the z180 or z280.

I think I have read that some versions of floating point routines
made use of the un-documented instructions. One version of Small-C
for the Z80 made use of this.

> Holger