Path: utzoo!attcan!uunet!cs.utexas.edu!sun-barr!olivea!mintaka!mintaka.lcs.mit.edu!ath From: ath@lcs.mit.edu (Andrew Heybey) Newsgroups: comp.sys.amiga.hardware Subject: Re: GVP Series II/A2000 problems---solution! Message-ID: Date: 5 Nov 90 17:43:04 GMT References: <1484@sumax.UUCP> Sender: daemon@mintaka.lcs.mit.edu (Lucifer Maleficius) Distribution: na Organization: MIT Laboratory for Computer Science Lines: 44 In-Reply-To: davidy@sumax.UUCP's message of 3 Nov 90 02:17:17 GMT In article <1484@sumax.UUCP> davidy@sumax.UUCP (David L. Yee) writes: I am in need of some help and or information. I just recieved my GVP Series II hardcard with on-board memory exapansion. This is the new one with DMA access. Anyway, it refused to operate with the memory installed and the memory configuration jumpers set appropriately. If I disabled the RAM jumpers, or removed the RAM entirely, the card booted and runs fine. Needless to say, I was a little perturbed, so I called up GVP today (11-2-90, 1:30 PST) and asked to see what was up. A person named Gary took my call. What he told we was this: I have a rev 4.3 motherboard. Gary said that Commodore made a number of 4.3 motherboards without a certain resistor. This resistor is a 470 ohm, 1/4 watt resistor that (I believe) he said was supposed to be connected to the DTACK line of the 68000 (My memory on the DTACK portion is a little hazy, the rest is not.) Anyway, here is approximately where it should go: [Diagram deleted]. I had exactly the same problem. However, the person I spoke to at GVP told me to install the resister at a silkscreened location just to the right and behind the power connector. I can't remember the resistor number right now, but it was four digits :-). The location next to the power connector is a lot easier to get to with a soldering iron than the location next to the 68000. Anyhow, I tacked in a resistor this weekend, and now everything works just fine. I ran a memory test overnight and found no errors. Since I have caused them so much trouble, I thought that I would plug the company from which I bought the RAM. When the SIMMs didn't work in my board, I first called GVP, who said that they had experienced problems with "cheap SIMMs" not working. I then assumed that it was the SIMMs that didn't work. TechnologyWorks sent me 4M of replacements via overnight mail at their expense. The new RAM didn't work either. I called them again, and they sent *another* 4M via overnight mail at their expense. This last set used chips from another manuafacturer (the first two were the same), which is when I decided that the problem must lie elsewhere and called GVP again (so I'm a little slow). TechnologyWorks *also* paid the postage for me to return the SIMMs that I thought didn't work. TechnologyWorks, Austin TX, 800-688-7466, $49 each 1Mx8 SIMMs -- Andrew Heybey, ath@ptt.lcs.mit.edu, uunet!ptt.lcs.mit.edu!ath