> -----Original Message----- > From: cctalk [mailto:[email protected]] On Behalf Of Adrian > Graham via cctalk > Sent: 01 January 2018 20:45 > To: General Discussion: On-Topic and Off-Topic Posts <[email protected]> > Subject: Re: ZX Spectrum Z80 Keeps Resetting > > >>> > >> It could be caused by bus contention, which may also be the cause of > >> the resetting. Possibly some of the decode logic has failed, and is > >> allowing > > two > >> devices to drive the data bus at the same time. I've seen this > >> before, > > and it > >> does cause spikes on the 5V rails. > >> > > > > That is interesting, I hadn't considered that. Given that it gets a > > fair way into the boot sequence it would have to be an intermittent failure. > > I’d be interested in putting my diagnostic ROM on that just to see what it > throws up. In the absence of having it in front of me so I can do that is the > ROM > socketed? You can easily burn your own if so. >
The ROM is not socketed. I have found that every time I desolder something from this board I end up damaging the through holes, just the suction from my de-soldering gun was enough to remove the "eyelet" today when removing a capacitor. I could socket it though as that would be useful anyway, and I can check the ROM contents and make sure it reads OK multiple times. Regards Rob
