nesdev.org

Yamaha's clones of AY-3-8910 contain built-in source clock divider by 2. It is optional in YM2149, controlled with a pin; but seems to be always enabled for YMZ284.

I'd add Prince of Persia. Although it wasn't natively created for MS-DOS PC, it only got the fame when it has been ported to it.

Warcraft and C&C also could be in the list, at least the first Warcraft (1994). Heroes of Might and Magic, maybe (1995).

Just read a new great book on the topic - Bob Pape's 'It's Behind You', about ZX Spectrum conversion of R-Type (one of the best games on the platform) that he handled back in 1988. A great insight both into tech side of things and in how daily life of a game programmer was like back then. I also see...

From old commercial ones, Road Fighter perhaps? Not to mention games with balls, like Pinball or Side Pocket.

Some homebrew games also had main characters smaller than 16x16.

You can put variables declared in C code into zero page using pragmas. Not sure which ones, as it has been changes between recent CC65 versions, in the version that I use it is this: #pragma bssseg (push,"ZEROPAGE") #pragma dataseg(push,"ZEROPAGE") static unsigned char i; //after...

Yes, the program counter is loaded with value from the reset vector at reset. I'd say that writing and debugging a 6502 emulator with a NES emulator at once is way more difficult thing to do than doing these things separately, because you could make mistakes in both counterparts without being sure w...

Take a look at SIDE and PIE . A function per opcode and per addressing mode will work and could allow to organize things clearly, but don't forget that it could hit the performance a lot as well, with many thousands of funciton calls per frame (so think about inlining, call table, etc). Read/write h...

16-bit audio is signed short, not unsigned, so it has range -32767 to 32768 with 0 as 'silence', not 0 to 65536 with 32768 as 'silence'. You square generator should always output either 0 or 1. It does not matter if it has variable duty or not. Then you need current volume of channel, which is 0 (si...

One way to work with large decimal numbers quickly is to store them in decimal format, like byte per decimal digit. It could be useful for score display and similar purposes, no need to perform binary to decimal conversion, while adding values isn't that much slower.

Another thing I think is worth to mention is the whole idea of how sound chips works. Generally they simply divide incoming clock frequency, which is pretty high (1.8 MHz in case with APU, as mentioned before) by constant and variable integer values. Resulting output could then go directly to audio ...

Tutorial on writing a NSF player or 2A03 sound hardware emulator for total newbies is something roughy equal to 'bulding a fusion reactor for newbies', i.e. it is a very specific area with very few people in the world ever interested in doing something like that. It is difficult to give recommendati...

Not too good with 8K CHR RAM, though, as there are only two banks, so HUD will either take space from background tileset or sprite tileset. Pretty easy/free to have >8KB of CHR-RAM with a homebrew. In theory yes, just use larger SRAM chip, which is normally 32K these days, with any CHR-ROM mapper. ...

HUD and text boxes always could be done as raster split with CHR bank switch at certain scanlines. Not too good with 8K CHR RAM, though, as there are only two banks, so HUD will either take space from background tileset or sprite tileset.

There are so called 'CPU simulators', like a 6502 simulator, that allow to enter and run a snippet of code. However, they are not tied to any particular hardware like NES. So if you want to debug NES-related code, you just have to use a NES emulator.

Любым удобным способом. Ни тесты на железе, ни на эмуляторах видеосигнала, ничего особенного в плане выбора оттенков цвета не дадут, разве что позволят учесть искажения, свойственные PAL/NTSC (в том числе dot crawling). Надо просто рисовать, учитывая, что такой-то цвет условно-красный, такой условно...