Home example 2 – Page 21 – techtravels.org

Amiga Floppy

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...

keith

4 comments

Latest articles

A501 Replacement Inactive

All SMT parts on order, rough idea of parts costs

So all the SMT parts have been ordered for the prototype PCB. Once they come in, I’ll be testing the placement of the parts on top of a printed layout to see if the chips/parts match the layout — if there...

101 views

Amiga Floppy

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...

101 views

Amiga Floppy

Am I reading MFM wrong?

I’m beginning to think that I don’t fully understand the signalling coming out of the drive. I understand the concepts behind MFM (I think), but the actual application to this project, I’m not so sure...

100 views

Amiga Floppy

got build environment working again, fixed uart code

So awhile ago I bought a quad core machine which runs Vista 64. Once I had the new machine, I tried getting my build environment for the AFP working again. NetBeans, the java IDE I use, has 64-bit support but there...

99 views

Amiga Floppy

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...

99 views

Amiga Floppy Inactive

more real world tests

So tonight, I put my new FPGA implementation of the amiga floppy project to good use. I read some more of my collection of amiga floppies. GREAT NEWS. It’s working like a champ. As a matter of fact, I selected...

98 views

Amiga Floppy

sync on data

The more and more I play with this I find that I’m limited with visibility. Its tough to debug when you constantly have to deal with this overhanging problem : The data arrives at my hardware, and to the PC...

98 views

Amiga Floppy

logic analyzers

I’ve recently received a couple emails on additions to the logic analyzer page. Once I get some time to check them out, I’ll make the corrections. I’ve been super busy with life — switched jobs...

97 views

Amiga Floppy

Finally had some luck with FPGA board

So I bought an FPGA eval board and a book on Verilog awhile back. I made some progress learning things, and had some simple things like UARTs, writing to the LCD, and even some small VGA software(hrrrm, maybe I should...

97 views

Amiga Floppy Inactive

found bug last night

With this new FPGA solution, certain tracks would result in what I call a “short read.” A short read is any received track that contains less than 28,125 delta T’s, aka pulse times. Given a certain...

97 views