So I was wondering exactly how effective the XOR checksum that Commodore used for the amiga sectors was. If I read a sector, and perform the checksum, and the checksum matches the stored checksum, then the data is the...
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working FPGA version of the amiga floppy project
So, I’ve been working on the FPGA version of the amiga floppy project for some time. I just recently had a fair bit of free time, and so everything came together rather quickly! I’m now able to read amiga...
finally got some memory working on the FPGA
So since I first picked up this Xilinx Spartan-3E starter kit evaluation board, I’ve been trying to get some memory working on the FPGA. The DDR is as elusive as beast as I can find. I’ve not yet given up...
Histogram of one track
Here’s a histogram of one track off an amiga floppy disk. Notice the peaks near 4us, 6us, and 8us. I’ve got this data from my logic analyzer, crunched through my little C proggie, and then graphed with...
Finally had some luck with FPGA board
So I bought an FPGA eval board and a book on Verilog awhile back. I made some progress learning things, and had some simple things like UARTs, writing to the LCD, and even some small VGA software(hrrrm, maybe I should...
my checksum algorithm
So I’m using an XOR checksum to detect errors in the transfer between the SX and the PC. I always thought it was a reasonably strong checksum, even though it’s still an 8 bit checksum. I found a neat...
