atheybey@PTT.LCS.MIT.EDU (02/11/89)
My A2052 (Zorro II 2MB memory board by CBM) appears to have died today. I will probably bring it in to a dealer on Saturday or Monday, but I wanted to ask the net a couple of questions first. I am relatively poor, so anything that I could check myself would be helpful. Scenario: I come home this afternoon, and the computer is locked up--it is displaying the WB screen as I left it, but does not respond (I generally leave my 2000 on all the time). I give it the ol' nerve pinch, and get the Workbench 1.3 screen (it should have rebooted from RAD:). I put in my boot disk, and get a Guru. Three-finger again, and I get a yellow screen. Power cycle, get WB1.3 screen, insert boot disk, it boots to the point of opening the initial CLI window, then hangs. Three-finger, back to yellow screen. Repeat. [Yellow means the 68k found an exception before installing the appropriate exception-handling code, according to the list of colors that I have.] I sigh heavily, and take the cover off. Power on, and this time it boots, except that I only have 1MB of memory. I try the board in several different slots, and the machine works fine, but still ignores the memory board. Questions: [Random one] The are two jumpers on the A2052, neither of which is mentioned in the documentation that I have. Does anyone know what they do? I am assuming that it is the memory board that is broken. However, I do not have any other boards in the 2000, so I don't know for sure that there isn't awnything wrong with the computer (maybe the auto-config circuitry is broken so that it won't find the board?). Does anyone know, given the above symptoms, what the chances are of there being anything wrong with the 2000? If auto-config is somehow broken, is the memory still out there in the address space somewhere so that I can poke around and test it? None of the chips on the board has had the smoke let out of them :-) or anything else obvious. Anything else I can test with a VOM? I could certainly replace a dead chip on my own. I don't have a 'scope (though I could lug the computer into work to use one if need be), nor do I think that I have the knowledge of the Amiga to trouble shoot on my own even if I did. Thanks for any help. --------------------------------------------------------------------------- Andrew Heybey, atheybey@ptt.lcs.mit.edu Room 509, 545 Technology Square Advanced Network Architecture Group Cambridge, MA 02139 MIT Laboratory for Computer Science (617) 253-6011 ---------------------------------------------------------------------------