Bee Posted March 28, 2020 Share Posted March 28, 2020 Need a little help. I bought this probably 20 years ago. I used it a few times back then. When I last booted it 17 years ago it was flakey. Flakey means it would white screen and hang. Have pushed all socketed chips down. Power on = Fans spins Black screen On floppy activity Tested with a second power supply same results. I noticed it has a piggyback socket on the CPU. Anyone know why you would do that? I have a working 1040 but was going to use this for games and my Superchrger IBM emulator. Any advice is appreciated. Thank you Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted March 29, 2020 Share Posted March 29, 2020 My advice would be to let repair to some electronic/computer expert, who has necessary equipment too. Piggyback was for sure because some expansion, what is removed . Really not relevant here. Quote Link to comment Share on other sites More sharing options...
Bee Posted April 18, 2020 Author Share Posted April 18, 2020 So I may reboot the Case and power supply. I found a way to get a Mega 4 mainboard and bring this back up. More to follow Thank you Quote Link to comment Share on other sites More sharing options...
+tf_hh Posted May 7, 2020 Share Posted May 7, 2020 On 3/28/2020 at 8:47 PM, Bee said: I noticed it has a piggyback socket on the CPU. Anyone know why you would do that? Any advice is appreciated. Do you know which kind of expansion was placed on top of the CPU? What may happen... if this board have had the blitter correction patch (a little PCB with a 74LS74 on it and one yellow wire to one pad near by the blitter) installed and this patch was placed on the removed expansion, then the whole system won´t start. Check the traces around the blitter with a magnifier, maybe you will find one spot where a trace is broken. Close is with a small wire and some solder - 90% of all blitters works without this patch. 1 Quote Link to comment Share on other sites More sharing options...
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