Path: utzoo!utgpu!jarvis.csri.toronto.edu!torsqnt!tmsoft!list-injector From: root@nebulus.UUCP (Dennis S. Breckenridge) Newsgroups: can.usrgroup Subject: Re: Is it the interleave? Message-ID:Date: 28 Sep 89 05:47:00 GMT Reply-To: root@nebulus.UUCP (Dennis S. Breckenridge) Distribution: ont Lines: 16 ST-506 interleave is recomended to be 3:1 unless you are running a Western Digital 1006-WA? or similar 1:1 controller. Most Diagnostic software with these controllers are accurate to a point. To test the controller out format it then run the PC Tech Journal Benchmarks If the disk test results are good at 2:1 leave it, otherwise format it for 3:1 or 1:1. Re-test it. Your interrupt problem is obvious. Com1 runs at a typical spl(6) level and that is high. Disk runs at a lower level but also uses DMA which means the cpu is put to sleep. Are you getting the idea. Modem is in xfer mode ... need a block of data ... disk is on wrong block or not cached ... put new disk request up... uucp times out ... disk request complete ... uucp still times out ... disk block is transfered ... interrupt is generated modem generates interrupt ... disk interrupt is suspended due to the high priority of serial port. interupt is serviced and modem now has data and everything is happy again. ignore typos and grammar... it is 2am