keith
Yeah, I’ve been slacking lately on the project. School has been keeping me busy, work too. My current problem is that something seems up with the data checksum routine, the code on the PC that is processing the...
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...
updates with FRAM access
My initial attempts to write to the FRAM used SX/B commands like SHIFTIN and SHIFTOUT. These operated at a slow rate of about 83kbits/s. It did work and functioned as a good test of the hardware setup. Now that...
high level overview pictures
I’m going to throw this up elsewhere on the site, but putting it here too can’t hurt.
memory chip mounted
Welp, I got impatient, and went to Radio Shack to buy their soldering station. I still have mine coming in the mail, but its ground from Arizona, which may as well be ground from Alaska. I soldered the header pins onto...
Magiquest at Myrtle Beach
I just got back from a week in Myrtle Beach, South Carolina. Not my ideal vacation spot, but it was half business, so why not make the other half pleasure?! In a shopping area called Broadway at the Beach, there was a...
Current updates
Wow. I can’t believe its been 20 days since my last post. Man have I been slacking. School has started up again, and add a week I was away on business/pleasure and there you have it. Here’s where I’m...
Latest attempt
Tim mentioned something in the last post regarding SYNC which really had me thinking about how to SYNC the data coming in the drive with the data going to the UART of the USB2SER converter. Then I was thinking, now that...
Parallax USR2SER
So I got my Parallax USR2SER in yesterday. Man is this thing tiny!! About the same width of my finger, and about 1/3 the length! And its mostly surface mount stuff….. It works like a charm. Easy installation, I...
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...
more hardware
When in doubt, just throw some more money at the problem! 🙂 Actually, I’m kidding. But I do have the Parallax USB2SER on its way — maybe the USB will be much faster, buffered, and more reliable. Those...
not the PC again?
I was doing some more tests trying to get the PC to fail. It seems that the PC really likes EVEN delays between data, and it’s wierd because faster data that comes in evenly is better than slower data that comes...
new design
I took David’s advice, and I rewrote the code last night. Some highlights: 1. ISR is entirely in assembly. Although I haven’t manually counted, it appears to be about 400ns in length. 2. ISR triggers only...
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...
losing data
I’ve been thinking more and more about how exactly I’ve been losing data. It’s alot of data. The worst case I’ve seen is about 140 bytes. This is 1120 bits, or 2240us. This is a LONG time for my...
more updates
I know I’ve been bad keeping you guys updated….. This doesn’t mean I haven’t been working on it, however. I recoded the ISR completely in assembly because I was just plain sick of the damn...
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...
