Comment Re:This is revisionist history at its worst. (Score 1) 392
Hypercard didn't have any access natively to the serial port or similar interfaces. To do this, one had to write an XCMD (wow, Dr Dobbs has a good archive) resource in pascal or C (or possibly assembly) to talk to the low level system/hardware. This created an additional command / function that Hypercard could call. To an extent, this did cause some fragmentation of the language
Looking at an old archive at umich, you can get an idea of what these xcmds could do.
To do anything beyond the basic capability of Hypertalk, it required you to be able to go in with resedit, download (or write) and add the appropriate additional functionality. This was a tool that was part of a programmer's toolkit - not a user's.