New Signs
Remade the signs for the Monroeville disc golf course. These will be printed and posted on each hole. Here are the white tee signs. .
nesdoug
NES Programming with cc65
Latest posts
IRQs
This is about NES 6502 assembly programming (nesdev) and might be difficult to do in C. If you came here for C programming, then this page is not for you. What is an IRQ? It is a signal that interrupts the normal CPU operation. For NES development purposes, it is for something that is time [ ]
Monroeville Disc Golf Course
Monroeville Park East Updated April 2026. They just put in concrete pads. The only major change is to hole 6. They appear to be putting in a 3rd pin placement (for everything but 10), but by April those haven t been placed yet. THIS PAGE IS OLD INFORMATION. HERE IS A LINK TO THE NEW UPDATES [ ]
ADSR Tests
I was experimenting with SNESGSS, and I noticed that the ADSR envelope sounded different than I expected. Look at the Instrument Tab, and see the AR, DR, SL, SR levels. The preview image draws a line to show you what the envelope should look like. But, it never sounded what it looked like so I [ ]
Console Wars
Back in the 90s, the SNES vs Genesis debate was raging. Sega would say blast processing over and over and that s all people remembered. Look how fast Sonic moves! Of course, scrolling speed has nothing to do with CPU speed. You could have ported Sonic over to the SNES with no trouble, and he would [ ]
Other Modes
See below for how Offset-Per-Tile modes work Most SNES games use Mode 1 most of the time. It gives you 2 layers of 16 color per tile, and 1 layer of 4 color per tile. All the other blog pages cover Mode 1, and I think we ve talked enough about that. Let s take a look [ ]
SNESMOD
Another option for SNES audio is SNESMOD. It doesn t have its own tracker, but you would use OpenMPT in the IT format, and save the file as an IT file. SNESMOD comes with a converter program called smconv.exe which can turn the IT file into a soundbank that can be used in a game. (It [ ]
Sega Genesis FM Instrument Basics
This is a bit off subject for my other topics, but I find this stuff fascinating. The Sega Genesis / Mega Drive has a very interesting FM synth chip, YM2612. It also has a simpler (pulse wave) audio chip, TI SN76489, which isn t much different from earlier consoles (NES, gameboy, etc), and I won t talk [ ]
Why B+21 Cents?
I keep getting this question, about why I make SNES samples tuned exactly to B+21 Cents. Let s start with these premises: There is a limited amount of ARAM space. In order to make best use of the available space, we need short, LOOPED samples BRR samples are made of blocks of 16 samples End point [ ]
Updates
2023 Famitone 5 updated, fixed issue with Qxx/Rxx effect sometimes not working (if it was on a separate line, without a note next to it). mmc3 example code has been updated, bug fix to stop possible conflicts with interrupts using the Bank Swap Register. !! Half of the NES example code was updated. Mostly changed [ ]