Ahhhhh PDS the memories and the crashes and the corrupted source files... I used it for 2 years against the ZX Spectrum (and I guess Amstrad and MSX but I don't actually remember) hosted on an Atari ST, and it was fast to iterate. But its speed, compared to development on 3" disks on the target machine, also gave me a glimpse into the value of those moments to think while the thing is building.