Atari designed the ST as a competitor to the MAC so it seems it was more intended as a business machine that as a games machine. The usage of GEM and hi-res 640x400 graphics mode points to a business machine role and the lack of gaming features in the hardware (no hardware scrolling, no hardware sprites) does not seem they intended it to be a games machine. Of course history proved the ST was (at least in the first years in Europe) used more as gaming machine (the processing power of the 68000 made it possible to do things in software were the 8-bit computers needed hardware support chips) but still had some great business applications. So I'm not convinced game cartridges were part of Atari's plan.
To a degree I would agree, but coming where Tramiel had come from the with the C64 etc, and the fact that unlike the Mac, the ST had colour resolutions; gaming has to have been at the back of their minds if not the forefront. The blitter was planned from nearly the start, which wasn't really a lot of use for business apps (although ironically it does help their response more generally than games, which don't take advantage of its presence unless specifically programmed for it), and there was a interview with one of the designers where he seemed to suggest the included sound chip was intended as being little more than a bleeper - the real deal never seems to have materialised, however (Amy presumably). There is also talk in one of the early Atari users of a further graphics chip (different from the blitter) being development. although that might be hearsay. I suspect the STs limitations as a gaming computer are more a result of the development timescale and cost bracket, rather than a deliberate aim to position the ST as a business computer. Custom chips take time to develop, which Tramiel didn't have, and they all add to the overall cost, which would have defeated the point.The machine looks like it is designed to be a all rounder, good for graphics, games and business, but not really excelling at anything (well apart from the overall package). This was always the attraction of the ST for me over the Mac and Amiga. It really is a jack of all trades (and master of none!). The cartridge port seems to be an odd thing to add if it isn't included for gaming, as for other uses it isn't as good, or even as easy to implement as a straight forward bus connector
I believe you are entirely right that the ST is meant to compete with and best the Mac though. All the ST line generally seems to react to developments in the Mac world, The Falcon for example is a bit like a poor mans NeXT computer, or a super powered LCII (thanks to the DSP, though the basic spec is the same), the TT is a bit of a Mac II. If I were to guess I would actually say that the Tramiel doesn't even consider the Amiga in the STs lines specs generally (bar the half hearted attempt with the STe), presumably as overall sales of both it and the ST paled next to the Mac.
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