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This heavily populated PCB is. That is an important distinction because the home version of Pong used a specialized chip to do much of the work. This is basically all stock logic, which explains the high component count. We wonder how many quarters it took just to pay for all 66 chips at the time?Pong74ls was the person who took on this project. There is an original schematic available, but it’s incredibly crowded and rather difficult to figure out. Fortunately Dan Boris has already done a lot of the heavy work. He took the one-page nightmare and turned it into (look for the schematic link under technical details).Before the board could be laid out some redesign work was necessary.

It sounds like some of the original chips are out of production and suitable replacements needed to be found. The board was then laid out in Eagle before sending the design off to a fab house. Righteous kill 2020. There was just one error which didn’t allow the ball to bounce when hitting a paddle while travelling downward. A couple of jumper wires fixed that right up!via.Posted in Tagged, Post navigation.

It’s sort of an analog and digital hybrid computer that implements the physics of the game, and it does use voltage on capacitors as memory. The article explains it in detail:“The vertical velocity of the ball is represented by the voltage stored on the 1uF tantalum capacitor. This velocity is integrated by gate12c, and the resultant voltage, which represents the vertical position of the ball, is added to the frame ramp at the input of gate 12b, to produce a negative going edge representing the vertical position of the ball.”“The voltage on the 220uF electrolytic capacitor represents the horizontal position of the ball. This voltage is added to the line ramp at the input of gate 11b, producing a negative going transition at the output corresponding to the horizontal position of the ball. This is squared up by gate 11a, differentiated, and then squared up again by gate 11d. The width of the ball is determined by the differentiator time constant.”.

What is the major cause you have found for integrated circuits failing? The only things I know of that kill them are poor voltage regulation, and trying to draw too much current through one due to improper circuit design. Beyond that I’ve never known one to ever fail. I’ve never seen a spring loaded socket be reliable though. They always fail. Machine turret sockets are more expensive than standard logic chips are too.

But if for some strange reason I feel I need to use a socket in a design it is all I’ll use.If you really need to remove an IC you just cut off all it’s legs and clear the holes one at a time. There are no bonus points awarded for pulling out a damaged part intact.

It is game over if you ruin the board though. Lots of amateur re-workers never understand this. I was taught by professionals though. I have a lot of ICs from the 1970s I’ve never noticed them being any less reliable than today’s chips. Less capable sometimes, the old ones used a lot more current to operate, some I suppose have noise issues too.

But if it works in a circuit, they generally keep working.You’re sure that 28,000 IC computer’s failures were all IC failures and not from other causes? I’d sooner believe solder joint thermal issues, or connector failures honestly. The high part count alone is what made it unreliable. I’m sure the folks that assembled it tried to do the best job that they could but I’ve seen what those old computers looked like and they were designed in situ.Back then you’d get a “new” computer from a manufacturer and you’d have to spend months rearranging things so it’d work!

No one ever said anything about it because that was just how things were. If you were a geek you were just happy you had something to play with.So are you sure all of those failures were IC failures? Even if they were it could have been due to faulty design. But the odds of all of those failures being purely because chips were failing is vanishingly small.

I’m sorry but I’d sooner believe it was roaches dancing in a conga line. Putting the part numbers and reference designators.under.

the ICs on the silk-screen layer is a bad idea. Once the board has been populated with chips, none of these numbers are visable.While the old schematic–as scanned–is a bit unreadable, there is still much merit in having the entire plan laid out before you on a single page. Otherwise you are endlessly flipping back and forth between 16 pages of separate schematics–each offering insufficient context to grasp the entire design.But still, this is a fun project, and the original schematic, some 40 years old, is still educational, offering insights in logic design and compromise. Yeah, that is maddening when you have multi-page schematics. Even worse when you have nets that cross more than two pages and ZERO indicator as to what page it’s on.“OK, So C1A34 is on page 6 and 12. That’s good, but why does Oh.

It’s on page 9 too? Then where does net B46AQ go?

What the Hell? I’m missing a page? Oh, it’s back here on page 3 No wait, that’s B46AO. Damn hand-written text.”It once took me nearly a week puzzling over where one net went off to before I discovered that A) it was in an entirely different book, B) it was mislabeled, and C) that that daughter card wasn’t even being used anyways.