[Info-vax] OT: news from the trenches (re: Solaris)

[seasoned_geek]

On Friday, March 13, 2015 at 12:28:49 PM UTC-5, glen herrmannsfeldt wrote:
> 
> The AT/370 maps into host memory at 512K to 640K. The XT/370 takes
> even more host memory space.  Yes terminal, printer, and disks, but 
> much of the processing that is done is S/370 code in real VM/370
> is done in 8088 code for VM/PC.  Some years ago, there was a company
> selling board sets for a low price, about $30 each. 

http://www.techadvice.com/tech/M/mem-adr.htm

Do you mean A000-FFFF? Also known as the dastardly 128. In theory all for the video card, but low end video cards used only a tiny portion so _everybody_ provided cards with jumpers and/or dip switches to change the settings so people could wedge the card in.

Let us not forget all of those "load high" utilities which would load drivers into the same region. It would seem to work for a while until you ran some software (like a game) which changed the graphics setting of the video card causing it to suddenly consume the memory where your driver/card was squatting.