Okay, my last 2 comments were basically a ranting over the fact that it is simple common sense when you design something. Steve Wozniak put chip sockets on the Apple II series because he didn't want to waste time desoldering faulty ICs from the PCB. Adding sockets would take him less than a minute to replace the part, compared to several minutes trying to desolder the ICs legs from each contact.
When Apple developed the Apple III, they did include chip sockets on the logic board. But Steve Jobs's decision to not put cooling fans in the Apple III caused one major problem; the heat generated while powered up and running caused the metal in the sockets to expand and eventually work the ICs out of their sockets. When this happened, the Apple III would appear DOA. Apple's solution to the matter was to literally lift the machine up off of the desk and drop it. This would cause the chips to reseat themselves. I don't believe that would even work all the time; you'd still have to get inside the case and reseat the chips by hand anyway.
The Apple III was not designed by engineers or technicians. It was designed by a committee or marketing department. If anyone has a copy of the book iWoz, look on page 226 through 230. I know that Woz doesn't explain about dropping the Apple III on a desk as a solution to its problem, but there are other sources that do mention about it. Yes, the problem was eventually fixed, but it tarnished the Apple III's reputation as being a serious business machine. And even Macs that are all-in-one models have similar heat problems, due to the case design and whether or not they have a fan.
Mac128, I do recall seeing DOS/Windows PCs with motherboards that have every chip socketed. Mostly they were clones of IBM XT and AT architectures from the 1980s, but in the 1990s it became a lesser known feature. Once boards started being made with only SMT components, then the need for sockets became less. Yes I did take a pot shot at the Apple III, but it was meant in good taste and to state the facts about good design practices, especially in electronics. I come from a background of being taught the old school way for modern design. It may cost just a bit more, but if it proves to make repair easier, then use it.
73s de Phreakout. :rambo:
When Apple developed the Apple III, they did include chip sockets on the logic board. But Steve Jobs's decision to not put cooling fans in the Apple III caused one major problem; the heat generated while powered up and running caused the metal in the sockets to expand and eventually work the ICs out of their sockets. When this happened, the Apple III would appear DOA. Apple's solution to the matter was to literally lift the machine up off of the desk and drop it. This would cause the chips to reseat themselves. I don't believe that would even work all the time; you'd still have to get inside the case and reseat the chips by hand anyway.
The Apple III was not designed by engineers or technicians. It was designed by a committee or marketing department. If anyone has a copy of the book iWoz, look on page 226 through 230. I know that Woz doesn't explain about dropping the Apple III on a desk as a solution to its problem, but there are other sources that do mention about it. Yes, the problem was eventually fixed, but it tarnished the Apple III's reputation as being a serious business machine. And even Macs that are all-in-one models have similar heat problems, due to the case design and whether or not they have a fan.
Mac128, I do recall seeing DOS/Windows PCs with motherboards that have every chip socketed. Mostly they were clones of IBM XT and AT architectures from the 1980s, but in the 1990s it became a lesser known feature. Once boards started being made with only SMT components, then the need for sockets became less. Yes I did take a pot shot at the Apple III, but it was meant in good taste and to state the facts about good design practices, especially in electronics. I come from a background of being taught the old school way for modern design. It may cost just a bit more, but if it proves to make repair easier, then use it.
73s de Phreakout. :rambo: