Tag Archive: NES

Oct 04

First Commercial Success


After ordering the wrong buffer chip for my Logic Cube I started poking around and managed to get a commercial rom to run.  It seems my issues are a result of timing problems with my new memory mapping module.  The attempt shown below locked up at the title screen but I have since managed to …

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Sep 29

Back To Work


It’s been a little while since I’ve posted any progress on any of my projects.  I’ve been recently employed as a full time design engineer and have finally transitioned back into a schedule that allows me to work on some of my own interests again.  I’ve started up working on my NES emulator and had …

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May 10

NES FPGA: First Run

I’ve managed to get the nestest rom to run on my emulator.  I’m still nowhere near complete but this is a good first step.  Video is working, at least without sprites.  Control input works, although there’s a bug floating around in there somewhere   I’m currently working on getting the APU ( Audio Processing Unit) up and …

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Apr 17

NES FPGA : Mini Breakthroughs


I’ve made significant progress since my first stumbling block.  I’ve rewritten my 6502 core so that it is synthesizable and have successfully deployed it to my nanoboard.  I have been able to tweak the data bus such that I can communicate with the internal cartridge, my PPU, and the external SRAM available on the nanoboard.  This has …

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Apr 05

Of Simulation and Synthesis

Log Comparison

I’ve made significant progress on my 6502 FPGA Emulation, and even have a mostly complete layout of the NES Picture Processing Unit.  I set up a test-bench that included RAM and cartridge simulation and logged the processor output to a text file that could be compared to the “golden” nestest log.  I was able to debug all …

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