nesdev.org

So i of course broke the HSYNC signal for my Gameboy (hardware, not talking about emulator here). Probably i might have touched other pins at the same time, or i grounded it wrong or something (noob at electricity). What's weird is that everything else works, i can actually get an image if i grab th...

Well solved it. got it open:) Also was able to repair the LCD (for now) which had those lines thanks to a friend who helped out and told me it was a bit common. Will have to do some other stuff when i get components, like making it USB powered and capturing the LCD, that was it will be much easier w...

It's DMG-CPU-05 from what i can see. My friend was skeptical why i didn't have triwings so we assumed that it might be that the previous owner opened it, forgot the screws or something and used phillips ones. Though it sounds unlikely, but we thought all used triwings which would make this a logical...

i have, but not tiny ones.

i would guess it's one of those 3 then, i mean it can't be bigger, cause the head is super tiny.

Okay noticed that i can't even open the Gameboy cause i lack the screwdriver for it. It's probably been opened before cause it's not triwing screws, but normal Phillips (+). I am horrible with screw sizes and types, but at least i can confirm it's a phillips, but i have no idea which size. So i am g...

Ah, well have to start play around and test somewhere, didn't even know these things existed, don't have any real experience with direct hardware stuff like this. So will get one of those, and a Raspberry Pi 3 as it seems to also be able to do something similar (and can be useful for random stuff an...

ah, hmm.

But let's say the buss intercepting like the link above.
Can such things be done with the thing and some wires?
And of course decoding it manually etc.

Ah okay that explains it.


Well analyzing stuff i guess.
Like intercepting signals from X to Y and see what's going on to play around and learn more of it.

but wait, isn't the DAC separate from the die (CPU?). Meaning the digital data is sent between those. Couldn't one just hook that, just like hooking the LCD bus? EDIT: So something like: http://www.ebay.com/itm/CY7C68013A-56-EZ-USB-FX2LP-USB2-0-Develope-Board-Module-Logic-Analyzer-EEPROM-/2009100973...

Actually meant the Audio, but was gonna ask the same about the LCD for that matter. what's Cypress's EZ-USB2, something specific for that or any kind of hardware trace? Didn't know decoding the LCD directly was a thing even, just thought about it yesterday randomly, that's really neat. Ah so the Sou...

Okay just me thinking out loud about stuff i have no clue about. It's not really about GameBoy Hardware per see, but still. Was thinking, is it possible to, let's say you have a GameBoy. And you somehow connect the, let's say DSP (if it even has any, can't remember) to a USB, meaning so that the dir...

Isn't the Half Carry flag set only if the value to subtract is higher than the source?

so, 3-4, 5-6 etc.
Cause it causes an overflow which makes it use the higher bits, thus bit 4 is used.

well VBA-M has some debugging tools as well.
Find all those impressive as i myself have a hard time doing such things.
The Step-by-step instruction debugging can be gold.

Okay got hold of a GameBoy for about 20 euros, so just waiting for the Flashcart thingy which shipped today, so will hopefully get it next week (Tuesday or Wednesday i think).
Will be interesting to play around with, then i can pretend i know this stuff and act all pro like;P

Yeah and for me that's what interests. Don't care much for the games per see, i mean sure it can be useful for testing too, but it's easier to write tests and compare results. Haven't written anything in the Gameboy ASM, but hopefully as i have emulated it's functions using those instructions for st...