Re:A bit of XENIX history (2014)
by rjsw on Wednesday April 07, 2021 @02:08PM
(#26728607)
The extra instructions were mostly fine, the NEC V20/V30 implemented them too, the 186 had built-in peripheral functions like timers and the interrupt controller that were different to those in a PC.
You couldn't use the array bound check instruction as it used the interrupt used by the PC BIOS for Print Screen.
Re:A bit of XENIX history (2014)
by jandrese on Wednesday April 07, 2021 @02:20PM
(#26728800)
That is a hilarious limitation. I can just see someone building a test program to try it out and wondering why his printer is suddenly spitting out screenshots.
You couldn't use the array bound check instruction as it used the interrupt used by the PC BIOS for Print Screen.