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Let's not forget that bit reversing the frame counter can be useful to allow subpixel velocities without having to store the subpixel position, as explained here.

Thus I won't go into detail about it. So much for completeness... I honestly have no idea what you're referring to, so I can't even research on my own. Don't worry, he's just talking about the SO (set overflow) pin that exists on the stock 6502. It's most known as one obscure feature the C64 CBM dr...

lidnariq wrote: ↑

Sat Jan 25, 2020 12:34 pm

What does the 26,06 mhz crystal on the nes motherboard do?

"Everything".

Recently, Chuck Ingerham Peddle, one of the main designer of the 6502, passed away. While he isn't with us anymore, the 6502 and all it enabled at the time (the NES, the Commodore 64, the Atari 2600, the Apple II and a myriad of other computers and video game consoles) will remain forever as a impor...

Different object types, such as moving platforms, like you mentioned, may need different properties, and I handle that by giving each object in the object definition table a "parameter" byte. If 8 bits are enough to represent an object's type's attributes, great, if not, those 8 bits are used to in...

Some Sunsoft games used short triangle bursts like za909 posted. The croaking frogs in Gimmick!, or some sound effects in Fester's Quest, etc. I think Metroid also used it for the "bubble" sound in the Tourian area music. It's not very common, though. Famitracker never supported it (though I dunno ...

tepples wrote:

bytestorm wrote:Is there any good softcore around of the RP2A03?

I can think of Bubble Bath Babes, Hot Slots, and Peek-A-Boo Poker.

Oh you, tepples. I actually giggled at that one. Good one!

You need 2 background palettes: Color 00: black; Color 01: white; Color 10: black; Color 11: black; Color 00: black; Color 01: black; Color 10: white; Color 11: white; The first palette honors bit 0 of the color index and ignores bit 1, the second palette honors bit 1 and ignores bit 0. This allows...

... and that's essentially what a Global Offset Table (GOT) is.

ARMv6-M (the core of Cortex-M0) is a bastardization; it's a stripped down, not very orthogonal copy of ARMv7-M (Cortex-M3). For instance, on the ARMv6-M, much of the instructions can only act on r0-r7, and the destination is forced to be the same than one of the operand —very few instructions can us...

With a ST Nucleo board and STLink utility, you could do an SPI flash programmer fairly easily. STLink utility comes with "external loaders", which can be used to flash external memories connected to a ST mcu. You can thus wire up a Nucleo to the SPI Flash, and then use an external loader that works ...

16bit report? That's... intense. Like, sure, the ADC in the controller is probably 10 bits in resolution, but 7 bits would be sufficient, right?

Two days ago, I attended a meetup of C++ Montréal. The presentation was about the presenter's (Frédéric Hamel) attempt to make a fairly accurate Gameboy (DMG) emulator in C++11. I have to say, it's quite a strange feeling to hear about things and people you only saw in the internet, never in the "re...

Happy New Year everyone!

tepples wrote:The only restriction on the scroll position in VRAM space and world space is that their difference has to be a multiple of 16. Allowing them to become unaligned recently bit me.

Care to say what kind of issue it causes? I'm curious, because I can't figure out the problem.

Are you familiar with the various indirect addressing mode? That's because you will need to deal with 16-bit quantities, and indexed addressing won't cut it, because it can only be used with 8-bit indexes. There are several ways to do this, but essentially, you need to put a pointer in zero page, ha...