techtravels.org

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...

Latest articles

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...

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...

PC to SX transfer images

I haven’t spent much time within the last few days on the project. Looking at the data on the PC, I think that there are still some problems. I think the problems lie in the fact that the interface to the parallel...

Site updates

Hi, I made some changes at my provider. I now have access to mysql which really opens up the world of various add on packages. I didn’t initially need or look for this support, but I have it now. I also have a lot...

example files

I wanted to put up some example files. Note that a preceding “D” for dump and two delimiting 0xFF’s might exist in these files. Also an ending 0xFF 0xFF might exist. So two bad files below have exactly...

Timing problems still?

I think I’m still having timing related issues. I have RTCC overflowing every 1.8us which I *know* is less than the 2us bit cell(or less than half the bit cell, if you take it to be 4us), but this seems to be what...

I’ve played around a considerable bit from yesterday. There’s something very strange about the speed the PC can react in certain circumstances, and I can’t quite nail it down. Now I haven’t...

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...

too many variables

I think that’s really the problem I’ve been facing with this floppy project. Trials and tribulations indeed. Or at least trial and error, with stress on the error part. There are probably less than half-a...