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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

timing movie

I have uploaded a movie showing 30 seconds of input signal vs detected result. I checked this frame by frame and I didn’t find a single error. I still can’t figure out why I have output errors. Maybe you can...

36 views
Amiga Floppy

new book

I picked up a copy of Reversing: Secrets of Reverse Engineering this past weekend. I have about 5 or 6 chapters read. All very good. It was published April 2005 or thereabouts, and so its much more updated than the book...

35 views
Amiga Floppy

current code plus recent progress

Although its ugly, the new code is here. This shows the entire ISR in assembly now. I do like it much better. Tonight I happened to transfer a track that has a good sector. The sector header passed checksum, as did the...

35 views
Amiga Floppy

vacation reading

While I’m on vacation this week, I’m reading a book about making your own circuit boards using Cadsoft’s Eagle. Eagle is a schematic capture and board layout program that seems pretty popular and...

34 views
Amiga Floppy

test results of my output file

What I wanted to know was if the output file that I collected via my setup was actually correct. I was confident that since I was getting 4489’s consistently, that I have to be at least part way...

34 views
Amiga Floppy

java and portability

While I have some experience with Java, I’ve never tried to run my stuff cross-platform. Never a real need. While most of the Java stuff has yet to be written, I took some basic serial code and GUI stuff, and...

34 views
Amiga Floppy

current results

Now that I have a portion of Marco’s old code implemented, I’ve run an output file from my SX through it. It’s one whole track from a capture of a DiskMonTools. It’s almost 14k long, which sounds...

33 views
Amiga Floppy

more SX to PC tests

Although I think I’ve long had this working good, I did some more tests just to verify. Latest numbers: Each cycle is about 15.8us, 2us per bit, 8 bits, this sounds fine. This does confirm, however, what I...

33 views
Amiga Floppy

java software progress

This morning I added MFM decoding, header and data checksumming and checking to the java client.  I was somewhat worried about doing the MFM decoding, but it was all worry for nothing. Once you wrap your head around how...

33 views
Amiga Floppy

Hardware and code diagram

I’ve thrown up a PDF that shows the basic hardware setup. It also shows the flow of my software, which is very simple. I didn’t put the clock details on there such as how often the clock rolls etc because...

33 views