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Achieve sound in games (and IPL menus) that use JAudio UCode.
I did a little research. This cell implements a typical circuit for a single counter bit.  
Examine all APU clock trees, similar to PPU.
Fix. 
Almost all sections show PLA simply as a topology (unmarked picture). You need to label the ports and decode the bit masks.

- [ ] Добыть ещё один экземпляр - [ ] Вскрыть и отфокать каплю с чипом 
BigEd on the 6502.org forum pointed to an excellent book on VLSI, where the FET device is explained on the basis of your fingers. We need to read it, get...