Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!hao!oddjob!gargoyle!ihnp4!ihwpt!knudsen From: knudsen@ihwpt.ATT.COM (mike knudsen) Newsgroups: comp.sys.m6809 Subject: Re: SARDIS Disk Controller -- got mine, DOA Message-ID: <1994@ihwpt.ATT.COM> Date: Fri, 11-Sep-87 15:42:46 EDT Article-I.D.: ihwpt.1994 Posted: Fri Sep 11 15:42:46 1987 Date-Received: Sat, 12-Sep-87 19:29:38 EDT References: <1991@ihwpt.ATT.COM> Organization: AT&T Bell Laboratories - Naperville, Illinois Lines: 21 Keywords: Stone cold dead, software mini-review Summary: Found the problem no hardware docs!!! Last nite I figured out the problem with my Sardis controller ROM. Using my ohm-beeper and some ROM mfgr's catalogs, I realized that a 24-pin ROM should work if *right-justified* in the 28-pin socket, just as shown in Sardis' ad photos (squint real close). Tried a 24-pin EPROM RSDOS 1.1 with 6ms step rate, and it worked just fine thru an evening of OS9 Level 2 (on the old driver software). Mail from chinet!draco sez I should've got a hardware manual with the beast, but all I got was the software docs (which are pretty good). Also mad at self for forgetting the right-justify trick, since six years ago I designed and debugged boards that could use either size ROM. What threw me off was the two power pins, tho that should have clued me in, but....this is what I deserve for being over 40 I guess. Sorry for the bother. BTW, draco (Kent), what else does that hardware manual have? Addresses and bits for control registers? Schematic ;-) ? -- Mike J Knudsen ...ihnp4!ihwpt!knudsen Bell Labs(AT&T) Delphi: RAGTIMER CIS: "Just say NO to MS-DOS!"