keith
Despite having a couple different official sources, both AFR.c and floppy.c from the fellow amiga emulator says that the even bits come before the odd bits. This is true in the sector header decoding as well as in the...
MFMSanityCheck
While I’m hesitant to post this at all, this is a quick and dirty application I threw together, and I do mean threw, that will check for valid MFM bytes. See the previous post for the link to the actual bytes. It...
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...
recent status
Well, I’ve put a decent number of hours in on the project over the last couple weeks. I’ve mostly been “spinning my wheels” because I haven’t made much progress, but I think I’ve...
looking at the code this a.m.
Welp, I decided to take a look at my code today, although I can’t actually implement anything until after I get home from work. 🙂 Not sure if I mentioned this eariler, but I’m now padding the data sent from...
Found another UART timing issue
Ok. A post or two back, I mentioned that I wanted to rework the receive UART because it wasn’t working perfect. I fixed that, and now it’s reliably receiving. I also mentioned that my sending uart code was...
good data vs bad
So you’ve seen me talk about good data and bad data. But what’s the difference? Good data looks like the picture I posted awhile back here. Note the very even spread of 4—4—8. Every pattern is...
slacking indeed
I’ve been horrible about the project lately. Dunno why. Today is the first time I’ve looked at it in quite some time. The last couple hours have been spent trying to remember exactly where I’ve been...
new pictures
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As you can see above, we have a “10” (4 us), another “10”(4 us) and a “1000”(8 us) chunks of data. Little noisy there.
minor success at 2:00am
well I’ve got MFM flowing from the PC drive now. A couple of things: Pins 10 and 14, the pins I’ve been using since last night, appear to be correct. Pin 10 is the motor lead. Dropping a corresponding SX...
going around the problem
Welp, I’ve ordered a new, but cheap ($5.99!) regular PC floppy drive from newegg.com. I like this end result much better anyways. PC drives are much more available, popular, cheap, and so on. was worried about...
more testing
so I put the amiga floppy back on the amiga, and the amiga reads disks no problem. Glad to see that my drive hadn’t fried through all my messing around. I haven’t seen valid MFM coming from the drive in so...
still giving me trouble
I spent some time on the project last night. Still no-go. The SX and the software is behaving as expected by responding to commands, transferring the buffer, so and so forth. I’m getting garbage data from the...
cleaned up the project
So after banging my head for awhile, things still aren’t working as they had prior to my stepping away from it. What I did last night was to partially dissassemble everything, and rewire a decent portion of it. ...
reading problems
I hate leaving projects for awhile. Any more than a few days, and you lose the focus, you lose the insight, and remembering exactly where you left off can be a pain in the butt. This time, I’ve come back to a...
progress on windows side
I put some time into the windows program that makes this whole thing tick tonight. When I first started this project, I started with Marco’s afr.c, and pared it down to the bare necessities. Then, I modified...
added version control and another command
I’ve really wanted version control for a long time. The ability to go back and undo diverse changes across sessions is valuable. I also feel a little safer and don’t mind doing semi-destructive edits...
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...
