Re: Non-working Commodore PET 3016
That's great, not only the right type of IC but made by the same IC manufacturer as the original IC, (National Semiconductor) so you'll be keeping it as original as possible.
Next step is to snip out the original IC - remember to do that high up beside the IC body, not low down beside the PCB, and then remove the IC body. Working on the top side, heat one of the pins and its solder pad, when the solder melts lift out the pin with tweezers, repeat until all pins are removed. Then, use your solder sucker to clear the remaining solder from all 16 holes. It's been said before, but to emphasise, solder suckers work best when there is a decent amount of solder to remove.
Before attempting to clear a hole put a shallow hump of fresh lead-tin solder on the solder pad - top side or lower side, whichever is easiest to get at. If the hole only half-clears the first time you try, put another hump of fresh solder back on the pad and try again and eventually you'll get lucky and the hole will clear properly. If this sounds a bit hitty-missy, it is. A manual solder sucker is not the ideal thing to have to be using but you can only work with what you actually have.
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