hardware - How did wave soldering work? - Retrocomputing Stack …
2020年11月22日 · To avoid solder on such and parts that should not carry any, a solder mask is used. That's essentially a layer of lacquer printed on top of the traces, wherever no solder needs to go. It also helps increasing fine details. In addition the PCBs are preheated, so the solder moves in right away. Naturally the traces heat better than the PCB.
What was the first computer board to be wave-soldered?
2021年3月18日 · The modern PCB, as we know it, was a war time development and so was wave soldering as a way to lower production cost while maintaining consistent quality. All this predates computers, so when computer production became serious manufacturing, that is more than single unit with special to type board, PCBs and wave soldering was used.
What causes the traces to wrinkle like this and should I be worried
Excess solder on the traces would be removed before the mask was applied, but usually not completely on large traces. So, after being masked, when the board was wave soldered to attach the electronic components, the original HASL solder, now underneath the solder mask, would melt again and reform unevenly under the mask during cooling.
Why does my IBM 5154 have an undulating wave?
Put it back together and it works, sort of. I can clearly see the picture that is supposed to be there but the blacks are not black in EGA graphics mode and there is an undulating wave. In non-graphics (text) mode, the blacks are black but the undulating wave is still there. Here's a video. How can I further troubleshoot this?
hardware - Why were chips socketed in early computers?
2018年9月6日 · *2 - Wave soldering is a rather secure process and around since at least 1947 (oldest usage I know). It does require to have the whole board plus all of the placed components preheated to 130-160 degree Celsius (depending on the process) for several minutes. In combination with (somewhat) early chips, this may cause failure within the chips.
Why user-assembled kits? - Retrocomputing Stack Exchange
2020年11月21日 · if every machine will be sold preassembled, the vendor can invest in things like wave soldering equipment that can do the job much more efficiently than a user doing it once on the kitchen table. I think this is a key point. Back in the 1970s, you did not have the super-cheap build-it-in-China and ship extremely inexpensively that you have today.
history - Minimum game cartridge manufacturing time
2024年3月26日 · Front and back cartridge cases were injection molded locally, I've handled the molds. Lead time on those, and double-sided PCBs, was a week or two and our supplier understood "rush". We had our own wave solderer. Commodity items were solder, screws, high-temp tape (so we didn't solder the gold edge connector), and shrink wrap for the box.
What's a safe and easy way to desolder the CPU from C64?
2017年8月23日 · Too hot (or too long) you will lift the pads or worse. Use a good solder-sucker if you don't have a de-soldering station. Take your time and do it right. It's sometimes a good idea to add a little fresh solder to loosen things up. Then, melt the solder and quickly use the sucker. Don't use solder wick for the bulk of the job.
8 bit microcomputers - Retrocomputing Stack Exchange
2018年2月1日 · The main clock output consists of a 4.5V (Vcc @ 5V) square wave at a 33.3% duty cycle, with an additional peripheral clock running at half of the main clock and a 50% duty cycle. Additional logic is provided to accommodate delays to allow for proper system start-up."
Have any 2-bit or 3-bit computers ever been designed?
2024年11月1日 · Heh I was going to suggest the Intel 3000 as well, as kind of a joke. It's not a standalone microprocessor. But the last sentence of the question is "Has anyone prototyped or seriously proposed designs that made significant use of 2-bit or 3-bit architectural feature