Path: utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!newstop!texsun!letni!dms3b1!dave From: dave@dms3b1.uucp (Dave Hanna) Newsgroups: comp.sys.3b1 Subject: Re: 3b1 Expansion Box with Rs-232 boards. Keywords: spl levels Message-ID: <1991Feb15.101308.23716@dms3b1.uucp> Date: 15 Feb 91 10:13:08 GMT References: <143@beyonet.UUCP> Reply-To: dave@dms3b1.UUCP (Dave Hanna) Organization: Infotouch Systems, Inc., Dallas Lines: 35 In article <143@beyonet.UUCP> beyo@beyonet.UUCP (Steve Urich) writes: [Discussion of expansion box full of combo boards, but being able to access only tty000-tty006] > Does anyone have a patch or know more about this problem? >I know it can be done, I worked the cmb.rc file and all the shell stuff the >way I think it supposed to be added, but I think the binary files are set >for a max of 6 ports and the unix.sym files shows spl0-spl6 something like >that. I wonder if it is that easy just to edit more to the unix.sym file? If I remember my internals from when I assisted on a Unisoft port, spl is the address of a routine that sets the current interrupt priority level to n, i.e., masks certain level interrupts off. Since the 68000 has 7 interrupt priority levels (of which the highest is non-maskable), it would make sense for there to be spl0-spl6. I think it is just co-incidence, and has nothing whatsoever to do being able to access only devices tty000-tty006. I may be mistaken (that was 8 years ago), and I won't be offended if someone more familiar with internals corrects me. However, your other supposition, that the binaries are set for a max of six ports, would not surprise me at all. That would certainly make as much sense as allowing a maximum of 2 hard drives and 1 floppy! > Steve Urich WB3FTP -- Dave Hanna, Infotouch Systems, Inc. | "Do or do not -- There is no try" P.O. Box 584, Bedford, TX 76095 | - Yoda (214) 358-4534 (817) 540-1524 | UUCP: ...!letni!dms3b1!dave |