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

java client preview

I’ve put up a preview of the java client in action. It’s a 2 minute video with narration. You’ll need a DivX codec installed in order to view it. I probably could have messed with compressing this...

revisited memory routines

I was looking over my reading and writing routines. Minimums for the fram are Clock high min. 28ns Clock low min. 28ns Data setup min 5ns I write in two places: First, when bits are coming in from the drive, and the ISR...

Halloween 2007 AFP updates

DTR-based PC to SX flow control is now enabled and working, thanks to jd2xx. It has been tested, and SX responds appropriately to a STOP request. Strangely, with the new jd2xx code, it doesn’t appear that flow...

Of timing, and general progress

I’ve determined that programming is like whack-a-mole(only took me 15 years to figure this out!) Fix one problem, and another one that already works stops working. This is what happened to me yesterday. My ISR...

funky idle routine

I’m making some progress. On a whim, I told my software to never go idle, to simply stream data constantly. I’ve never liked how I handle the idle state, and I currently lose whatever data thats in the shift...

updated code and comments

  Here’s a current version of the code.  I cleaned up my code tonight, added a bunch of comments, and tried to explain and document what I’m doing and the logic behind it. The current code is so much better...

Good news. Floppy now under SX control

OK, so I finally bit the bullet and have the floppy drive under direct SX control. I have my amiga power supply, which is a modified PC supply with harddrive leads powering the drive directly with +12v and +5v.  I also...

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...

current read problems

It seems as though when I have a read problem, its normally minor, and is a single bit error. I notice that the errors have a tendency for 0s to be incorrectly interpreted as 1s. So I get AB instead of 2B, AB instead of...