PC Engine dev forum

Here is 2 utility routines. The first one left shift a 16bits word by 3, storing the result in 3 bytes. The second sends 20bits to the memory base 128. ; Left shift a word by 3. ; in: $e206/$e207 input word ; out: $e204/$e205 input word ; $e206/$e207/$e208 input word shifted to the left by 3. l6220_...

It's reverse engineering month!
Reverse Engineering WipEout (PSX)

Damn, this reminds me I forgot to sent it to the guy who dumped the magic griffin eprom.

Indeed, .bss starts at $2200. The first 256 bytes of $2000 is the zero page. You can declare stuffs there using the .zp directive. Next comes the stack ($2100 - $21ff included). There's no directive. You can still read/write there but you'll most likely shoot yourself in the foot as it's used to sto...

Woops!

I think I'll add some explanations about IRQ setup and VDC display registers ($0A-$0E) initialization as it's usually done at startup.

Thanks for the feedback. If you forked it, you can submit a pull request.

Let say you want to start coding something for the PC Engine but you want to do it all by yourself. At first it sounds simple. Nonetheless, there are a few "gotchas". 1. Interrupt vectors. Interrupts vectors are the addresses of the routines run when interrupts are triggered. There are 4 o...

Update: Added Hu7 CD documentation and Develo Book Assembler scans.

A *beep*load of algorithms and their implementation in Java : http://algs4.cs.princeton.edu/code/