6502 emulator c github code#
The sample/draw.s file contains well commented 6502 assembly code for a simple program which allows you to draw multi-coloured lines with your cursor keys. Only key presses where the code is <= 0xFF are logged. SDL is used for reading key presses and the code for each key is. The last key pressed is stored to 0xF001 and it's up to your programs to clear this out after reading if you don't want to repeatedly read the same keypress. Writing a byte to 0圎000 will draw a pixel at the top left and at byte at 0xF000 will display at the bottom right.Įach pixel can be one of 256 colours where bits: Each "pixel" is blown up to be 8 pixels in size so things are nice and blocky. Resolution of the "attached display" is 64 * 64, so 4096 bytes. Resources are linked at the bottom of this. This involves, of course, understanding its instruction set and its encoding format. The challenge is to write your own 6502 CPU emulator.
6502 emulator c github update#
This is fine for playing around with video stuff (like in the sample) but if you want to update the entire screen quickly it's rubbish - see comments in sample/draw.s about the "clear_screen" routine. The Top 2 Emulator 65c02 Open Source Projects on Github. This one is obviously towards the more advanced side of the spectrum. define sysRandom fe an address define adozen 0c a constant LDA.
The hack here is that every time a byte is written to video memory a delay of 20ms is introduced. That thing below is a little JavaScript 6502 assembler and simulator that I.
This is something I'm considering adding but isn't currently at the top of my list.feel free to submit a PR.īecause there is no real timing it was necessary to do something with the display, otherwise it would be updated far too quickly. There is 64KB of memory and this is broken intoĠx0600 - 0xDFFF - Program - always make sure to assemble programs for this addressĪt the moment there is no emulation of clock cycles and so programs will just execute as fast as they can and it's not possible to introduce delays by looping and counting cycles. Feel free to submit a PR if you want specify the path to the binary on the command line ) Memory Layout
If you want to run a binary of a different name just update the path in src/main.cpp. When run this will load and run the sample/a.o65 binary and run it.
0 kommentar(er)
