Yes, your link says the limits was designed to to avoid the dreaded "regen".I remember that. Well vaguely. I think one flavor was memory / processing based in the good old days. The other was some kind of pre printing rigmarole.
I recall the regens using AutoCad on a 286 machine could be 20 minutes, and basically had to be avoided at almost any cost.
We ran the 286 machines for a few months, and then they found some hyper-fast video cards, which basically was a computer on a card, with a lot of memory, and a lot more processing power than a 286. The video card was not constrained by the 640k memory like an IBM PC.
The video card was $4,000.00, and than was in 1986 money, or thereabouts.
A 286 with the video card was well over $12,000.00 as I recall.
With the video card, regens were not bad at all.
We used AutoCad and VersaCad in the same office, and they were not compatible programs/files as I recall.
We had AutoCad-VersaCad user wars in the office, with lots of bloodletting, pickforks, burning torches, eye gouging; each side making a concerted effort to stamp out the rival 2D CAD users and program.
When the set up the first four 286 AT machines in our office, they hired computer guys to run them.
The computer guys did not know how to use a CAD program, and had never done manual drafting, so they were totally useless.
The engineers refused to work with the CAD guys, and so after about 4 months, they fired the CAD guys, and trained the engineers to do CAD on the computers.
Doing your 2D drafting on a computer in 1986 was like making some sort of scared pilgrimage to a holy place (the computer room).
You did not use CAD at your desk.
For several years, we would try to do an entire project in CAD, and get about half way through it, and then run out of time, print out all the drawings, and finish the project by drawing manually on vellum.
The early CAD days were about as much fun as plowing a frozen field with a wood plow.
VersaCad did not have XREF's, but in many ways was easier to use than the AutoCad of those days.
AutoCad was unstable for many years, and never really had a very advanced interface.
AutoCad had the lowly command line, and my 2004 version still uses the command line, which is basically the DOS method when we did not have mice.
We used a sneaker net, with 5.25" floppy drives.
One of the wordprocessing women was typing a spec too fast, and she accidentally typed "the files shall be exchanged via a floppy ****", and did not catch her error.
We never let her live that down.
Those were the days for sure, but not good days for CAD.
There was a civil war between the various CAD programs and users.
There was no network, and so people over-wrote each other's files.
The pen plotters were terrible.
Many of the engineers gave up trying to learn CAD in disgust, and went back to drawing everything on the drafting board.
Computers and programs were not so good back then. There were a few good programs.
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