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Technology Stocks : All About Sun Microsystems
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To: JC Jaros who wrote (27301)2/7/2000 12:05:00 PM
From: rudedog  Read Replies (1) of 64865
 
JC -
Although times have changed, in the early days Thomas was speaking of, assembler was a high level language... in the late 60's I knew IBM 1800 and 360 machine language by heart and could look at a subroutine and tell what the calling parameters and referenced segments were - I also knew most of the OS at the machine level and occasionally wrote core that modified the OS through a device known as "INSKEL COMMON" which was a common data area in the OS itself... probably to the chagrin of programmers who followed my trail, self-modifying code was one of the tricks I used to save memory.

1800s were used a lot in real-time process control, and several of us became proficient at writing patches in machine language on a running machine, then banging the pointer to link the patch - all in realtime, on a machine that was controlling a glass furnace or steel mill. These were actual "core" machines - the memory didn't go away when powered down - so it was possible to resurrect even a bombed machine if most of the code was still in good shape... and also go around in memory and look at anything you wanted, even after a re-boot.

Virtual operating systems pretty much put an end to that since the memory image was not stable enough to fool with...
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