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

error correction using hamming distances

I’ve been thinking for quite some time about error correction.  About using the structure of the MFM to our advantage.  I’ve come up with something although I haven’t implemented the idea yet. As you...

Amiga MFM possibilities

Today, while thinking how the heck I’m going to integrate my 3mbps Parallax USB to Serial converter, I was trying to figure out exactly how many different possibilities there are coming out of an Amiga floppy...

results from adding the PJL

So, as I mentioned in another post, I added Jim Thompson’s phase-jerked-loop to the project.  Phil had good luck using it with his DiscFerret, but it really didn’t help me.  My problem disks are still...

status updates

I’ve been more active on the project than the posts have illustrated. I’ve been working on a few different things : Been trying different PLL solutions, examining how Paula does it, and actually analyzing my...

on recent disk reading results

(this was posted to Classic Computer mailing list, please disregard if you’re on the list.  I think this is an important topic) The last two nights I’ve been busy archiving some of my Amiga floppy collection...

My new i7-4790k Desktop build

I needed some more horsepower for my FPGA compiles, and because it’s been so long since my last PC build, I decided to take advantage of some free time I had, and build a new machine. This machine is a quad-core...

RTC Progress

RTC appears to be working and keeping the date and time across cold-starts. I picked the Epson RTC-72423 which is about a $6 chip, but is obviously directly compatible with the OKI Semiconductor MSM6242B.  The design...