UCBVAX:@sri-unix (09/10/82)
Date-Sent: Sun Sep 5 08:09:09 1982 To: uok!duke!decvax!ucbvax!info-micro at BRL, Via: Ucb-C70; 10 Sep 82 3:39-EDT Via: Brl; 10 Sep 82 3:50-EDT Via: Brl-Bmd; 10 Sep 82 3:57-EDT Via: Brl; 10 Sep 82 2:25-PDT Still more data on the ADS 6809 SBC, and a plea for help: As you folks out there have probably read in an earlier letter, the 6809 doesn't know from vectored interrupts, and in trying to use the ADS 6809 SBC I'm beating my head against that now. Many, many manufacturers of boards for the IEEE S-100 bus use the vectored interrupt lines. (After all, the Z-80 knows how to handle them, right?) Well, the folks at ADS haven't set the board up to puzzle out vectored interrupts for the 6809, either. So--I'm basically wondering how to connect the vectored interrupt lines so that they show up as input to one of the on-board parallel ports. If anyone out there in CRT-land has done this, or thinks maybe I'm barking up the wrong tree (in the sense that there's a better way to deal with vectored interrupts and pass the data on to the 6809; Z-80 bigots need not reply), I'd greatly appreciate any information you could pass along. James Jones (...!duke!uok!uokvax!jejones)
larry (09/13/82)
One way to channel the 7 vectored s-100 signals into 1 would be with a 8259 interupt controller (or similar). For example, the Godbout System support board does just this (7>1). The System Support board might be a bit expensive to get just a 8259, but you might try putting it in the "kludge area". Larry Marek Bell Labs Naperville ps James are you the same James Jones that used to be here at IH?