Path: utzoo!attcan!uunet!husc6!bloom-beacon!gatech!purdue!i.cc.purdue.edu!j.cc.purdue.edu!pur-ee!uiucdcs!uxc.cso.uiuc.edu!urbsdc!aglew From: aglew@urbsdc.Urbana.Gould.COM Newsgroups: comp.arch Subject: Re: PDP-10 user I/O Message-ID: <28200154@urbsdc> Date: 1 Jun 88 03:39:00 GMT References: <21820@amdcad.AMD.COM> Lines: 28 Nf-ID: #R:amdcad.AMD.COM:21820:urbsdc:28200154:000:1256 Nf-From: urbsdc.Urbana.Gould.COM!aglew May 31 22:39:00 1988 >I also would like to see hardware manufacturers make it IMPOSSIBLE >for operating system writers to prevent use of IO, all instructions, >etc, by ALL programs. I find it frustrating to find many otherwise >lovely computers rendered useless to me by an operating system which >prevents me from writing programs the way I like. How hard would it >be to have a jumper on the CPU board that would circumvent the bits >in the PSW that prevent user-mode programs from doing IO and taking >interrupts? > >Doug McDonald Back into advertising mode, sorry. Gould UTX supports something called "hardware privilige mode", so that user programs can do anything the hardware can - and still enjoy the convenience of UNIX system calls, etc. I've been using it for performance measurement programs. Andy "Krazy" Glew. Gould CSD-Urbana. 1101 E. University, Urbana, IL 61801 aglew@gould.com - preferred, if you have MX records aglew@xenurus.gould.com - if you don't ...!ihnp4!uiucuxc!ccvaxa!aglew - paths may still be the only way My opinions are my own, and are not the opinions of my employer, or any other organisation. I indicate my company only so that the reader may account for any possible bias I may have towards our products.