Steve said:"Cameras and PCs are very differnet in that at the outset of PC existance a generic standard was adopted."
Not really. In the beginning there were many personal computer standards. Most of these disappeared. When I bought my first computer in 1978-79, it was a "Compucolor II". It had a proprietary File Control System, a proprietary version of MS-Basic built in and was very flexible. It was very advanced compared with the other home computers such as the TRS-80, Commodore Pet, Apple 2. But in the early 80's they disapeared. Later there came the Atari's and Commodore 64. Each brand was incompatible with the others. In the business world it was just as bad. Many computers used the CPM operating system, but had incompatible disk formats. As newer computer came to the market, the older formats (and all the software/data) died.
Then IBM put out the first "PC" with PC-DOS (a proprietary version of MS-DOS). There were other computers with generic MS-DOS that were "almost" IBM compatible. During this time there were significant advances in speed and memory (4k, 8k, 16k, 32k, then the famous statement by a head of a famous software company that nobody would ever need more than 32 or 64 k, etc). Then there was UNIX, then there were all sorts of varieites of high capability servers. In each category (home, business, server, workstation, etc.) there was no compatibility between brands.
Each year new capabilities were released. If you needed a new computer most of the stuff you already had was no longer useful. It was a very expensive time. Eventually software houses legally reverse engineered the PC-DOS, and eventually, that famous software company resolved the compatibility problems by essentially taking over the world
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The difference between PCs and digital cameras is that while the different brands are incompatible, they different models within a brand share the same accessories (lenses, flashes, etc.) And there are the 3rd party lens manufacturers who still provide for all the different brands.
This is probably where Minolta made it's biggest digital mistake. Their first DLSR (RD175) was too expensive and the technology of the time too limited to be a big hit. Their second one probably would have succeded except they used the VECTIS APS mount rather than the MAXXUM lens mount. They sort of tried an approach similar to the 4/3-Olympus approach, but annoyed their Maxxum lens users. They should have kept their 2nd DSLR compatible with their primary film SLRs.
Tom