The HP3000 [0] ("classic", pre-PA-RISC) was stack-based. It was a pretty popular business machine; the Classic architecture was produced between early 70s and e

The HP3000 [0] ("classic", pre-PA-RISC) was stack-based. It was a pretty popular business machine; the Classic architecture was produced between early 70s and early 90s. It was 16-bit, segmented, Harvard, and competed against IBM S/32 - S/36, AS400, PDP-11, and Vax. To most programmers there wasn't anything too special about the architecture; almost all development was in RPG, COBOL, or a really incredible (for CRUD) 4GL product from Cognos called Powerhouse [1]. [0] https://en.m.wikipedia.org/wiki/HP_3000 https://en.m.wikipedia.org/wiki/HP_3000 [1] https://en.m.wikipedia.org/wiki/PowerHouse_(programming_language) https://en.m.wikipedia.org/wiki/PowerHouse_(programming_lang...