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Amiga Floppy

inital results on error correction

While I have yet to actually implement the full-scale error correction as I want to, I did some manual tests today. I basically took a track that I was erroring out on, and swapped in 1-bit away values for the bad bytes.  In some cases, it appeared...

keith
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Amiga Floppy

writing merged USB comm code

Now that I have USB receive working in the main PC code, its time to merge the USB transmit(and receive for commands) into the main SX code. I have two pseudo-code versions written. 1> First version uses the ISR to...

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Amiga Floppy

PC xfer still not working

Well I completely rewrote the code. And surprisingly, it looks pretty similar to what I did before. I moved the store/transfer routine out of (being called from) the ISR to the main loop. As soon as the ISR detects a...

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Amiga Floppy

SlackFest 2007

Ok, I’ll admit it.  I’ve been slacking like the best of them. I’m not horribly unsatisified with my progress, especially this year.  The first four months of this year I achieved the following: * Whole...

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Amiga Floppy

not the PC again?

I was doing some more tests trying to get the PC to fail. It seems that the PC really likes EVEN delays between data, and it’s wierd because faster data that comes in evenly is better than slower data that comes...

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Amiga Floppy

still no better

Well I’ve decided that my current approach just isn’t improving the situation. And despite help from a lot of people, I’m no better off than I was a few weeks ago. I happened to stumble upon...

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Amiga Floppy

Timing image

I just wanted to throw this up here to show an example of how the timing is working on my project. Its working well. Top line is the input signal from the drive. Bottom line is the firing of interrupts, either from the...

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Amiga Floppy

PC might be the problem!

I think I’ve found at least one problem here. My PC is at least one problem. Even though I’ve done extensive tests with the PC in the past, including measuring a 9us total cycle time, it appears the PC must...

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Amiga Floppy

more hardware

When in doubt, just throw some more money at the problem! 🙂 Actually, I’m kidding. But I do have the Parallax USB2SER on its way — maybe the USB will be much faster, buffered, and more reliable. Those...

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Amiga Floppy

new pictures

 

As you can see above, we have a “10” (4 us), another “10”(4 us) and a “1000”(8 us) chunks of data.  Little noisy there.

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Amiga Floppy

Latest attempt

Tim mentioned something in the last post regarding SYNC which really had me thinking about how to SYNC the data coming in the drive with the data going to the UART of the USB2SER converter. Then I was thinking, now that...

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