Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!sharkey!mcf!mibte!ccd700!fmeed1!matz
From: matz@fmeed1.UUCP (Rick Matz)
Newsgroups: comp.sys.amiga
Subject: Lucas Board/Amiga 1000 Problems
Keywords: LUCAS 1000 NOISE ANGUISH HELP
Message-ID: <3397@fmeed1.UUCP>
Date: 25 May 89 12:41:42 GMT
Distribution: usa
Organization: Ford Electronics Division, Dearborn MI
Lines: 78


[Line eater morsel]

[I am posting this for a friend who does not have net access...Please email
 replies to me and I will see that he gets the info, and if there is any
 interest, post a summary as well]
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A little while ago, I took the plunge and bought a Lucas board. Assembly was
rather straightforward as was the installation. In fact, it powered up right
away and everything worked well. That is, until the hard disk was attached to 
the system. I am wondering if the Net can offer any suggestions that might 
help me to correct its operation.

Problem: Amiga + Lucas runs wonderfully until hard disk is attached. When HD
	 is connected, Amiga Gurus and/or erratic booting occurs (no WorkBench).

Suspicion: The Classic Noisy Amiga Bus


System Configuration:
   Amiga 1000   (Motherboard notation: Rev A 327049-01   #Y8AA1070247)
   (2)  3 1/2 " Floppies  (internal and external)
   512K RAM     (No memory hacks)
   Hard Disk
      238R Seagate 30 Meg Drive
      4070A Adaptec Controller
      C Ltd. SCSI
   C LTD Pal replacements  (2 pal chips into daughterboard)
   Grounded pal mod (4 pals on KickStart board hardwired to motherboard)
   Running 1.3

 Lucas Board Details:
   MC68020RC16B  (2A70N8624)
   MC68881RC16B  (2B81G8825)
   18 MHz Xtal
   68000 socket installed on Lucas board (but no Pixar hack yet)
   Hardwired gnd to motherboard (from "Gnd" hole on Lucas board)
   Jumper applied between J1 and J2 "square holes"

 The Amiga boots with no hard disk attached using a 18 MHz crystal and a U9
 value of 74ALS74AN. All operations appear to be correct. When the hard disk
 is attached, the Amiga will ask for KickStart, chew on it for a while,
 appear to be ready to ask for WorkBench, but instead go nuts with VERY
 erratic behavior:
    * Sometimes asks for KickStart again
    * Sometimes Gurus with numbers like 00000004.00001970  (Software failure)
				        0000000A.00001970
				        0000000B.00001970
				        00000000.00001970
    * When it gurus, and asks for a left mouse button to retry, sometimes the
      mouse appears to have no effect.
    * Sometimes gets almost up to asking for WB, goes to a gray screen, power
      light flashes 5-6 times (including a few VERY fast flashes), goes to a
      dark screen, goes to the grey screen, cycles power light.....(etc).....

Swapping crystals (16, 18, or 20 MHz) and all the different U9 families does
not seem to help. One question I have is in regards to the grounding mods.
Is there a preferred location for the grounds? I presently have the gnd wire
for the Lucas board and the ground wire for the 4 pals tied together on the
motherboard on the left hand side of the Amiga (as you face it) on a ground
pad near the power supply. This was on the advice of C Ltd. when I replaced
the 2 pals on the daughterboard with their 2 pals.

I am presently at a loss for what to do next. I have heard that there is a bus
termination mod. Is anyone familiar with how to do it?

Any clues, suggestions, or outright fixes would be greatly appreciated.


Thanks, 
   Ron Buchholz


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