Path: utzoo!dciem!array!colin From: colin@array.UUCP (Colin Plumb) Newsgroups: comp.periphs.scsi Subject: Re: Wren-V Parity jumper Message-ID: <493@array.UUCP> Date: 14 Aug 90 19:31:52 GMT References: Distribution: comp Organization: Array Systems Computing, Inc., Toronto, Ontario, CANADA Lines: 24 The parity jumper enables parity checking on the SCSI bus; parity generation is always on. If your system will run at all with parity checking enabled (i.e. everyone generates it properly), you should leave it enabled. I know it completely eliminated some minor flakiness I was experiencing. BTW, from my WREN-V OEM manual, there are 7 positions on the jumper strip. Starting from the side closest to the 50-pin SCSI connector, they are: 1) Parity Enable (plugged in = checking turned on) 2) Motor Start Option (plugged in = motor will not turn on until Start Unit SCSI command received; otherwise it will start on power-up) 3) SCSI ID bit 0 (value = 1) 4) SCSI ID bit 1 (value = 2) 5) SCSI ID bit 2 (value = 4) The last two positions select terminator power. The pin on the far end, away from the PC board, supplies power to the terminators. If it is horizontal, power is taken from the TERMPWR line on the SCSI cable. If it is vertical, power is taken from the drive internally. The pin in position 6, closest to the PC board, is not connected. -- -Colin