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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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Latest articles

Amiga Floppy

pullups

These are all 2us per division on the scope.  Top trace is the actual MFM, bottom trace is the entering and exiting of my ISR.  You should see an entry into the ISR for every falling edge, and every ~2us afterwards. 1k...

101 views
Amiga Floppy

today’s successes

I really stumbled on some stuff, and I think I have traction on a couple of problems. 1. My sizes are absolutely perfect. For me, this is a big milestone. This tells me alot. I’m getting perfect distances between...

101 views
Amiga Floppy

Am I reading MFM wrong?

I’m beginning to think that I don’t fully understand the signalling coming out of the drive. I understand the concepts behind MFM (I think), but the actual application to this project, I’m not so sure...

96 views
Amiga Floppy

AFP 0.2 WIP SX code

I’ve put some work into cleaning up the SX code tonight. I’ve removed some code sections no longer needed, and added documentation where it was lacking. Code should be commented pretty good. I’ve also...

96 views
Amiga Floppy

of bit-shifted sectors

I’m beginning to think more and more that my software on the SX is just fine. Perhaps minus the idle routine mentioned in the last post. I have to do something there. However, without the idle routine, I was only...

93 views
Amiga Floppy

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...

93 views