Home example 2

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

Oscilloscopes and Logic Analyzers

Hands-Free Debugging: Reviewing Gisler Precision’s Probe Holders

Disclaimer: While I purchased these myself at full price, Gisler did pay for shipping. This is my own opinion. If you’ve ever tried to hold multiple scope probes steady during debugging, you know how frustrating...

228 views

Badge Computer

Cirrus Logic CS4335 DAC problems finally identified and fixed.

I had some assistance in fixing this problem. My always helpful friend Brian from Canada as well as some help from Steve @ the Audacity forums contributed to solving the problem. They filled in some blanks for me, and...

228 views

Badge Computer

J68 can now speak with BEMICRO MAX 10 onboard SDRAM

So for the longest time, I’ve wanted to use the onboard 8MB SDRAM that is present on the BEMICRO MAX 10 fpga eval board. This is now a reality! I’ve successfully integrated a controller with some glue logic...

223 views

Badge Computer

Memory controller work continues….workaround 4MB SRAM add-on

SO here’s a couple hundred dollars of SRAM parts ordered to add on to the FPGA. It goes like this: the memory controller isn’t fully integrated yet into the J68 soft-core, so I’ve decided to whack on 4...

220 views

Amiga Floppy Inactive

New demo video for the FPGA version of the AFP!

New demo video for the FPGA version of the AFP!
Enjoy!
(45mb download warning)
FPGA implementation of AFP demo

216 views

Amiga Floppy

working on the floppy interface

Well I’m now inline with a data tap, so I have access to all 25 pins on the floppy interface between the amiga and the floppy drive. I used to attach to the DB23 on the pass-thru port of the floppy drive, but I...

214 views

Badge Computer

left-justified DAC problems continue

Here you see the analog sound waveform coming out of the DAC at the top in yellow. I think I’m getting closer……I switched from the I2S DAC to a left-justified DAC just because the LJ one is a little...

205 views

Amiga Floppy

inpout32.dll vs WinIo

From a previous post, I mentioned WinIo as a nice way of accessing the parallel port from win2k. However, it was slow. The authors said, “I should be using MapPhystoLin() anyways”, whenever I asked about...

192 views

A501 Replacement Inactive

Workbench booted up with the new card installed!

For those of you who might not get the significance, workbench loads a number of libraries into the extended fast memory on bootup. As you can see in this image below, more fast memory is actually being used than the...

187 views

Amiga Floppy

problem with high density disks

I’m running into an issue with HD, high density, floppies. The output on the scope looks just fine, but I get a consistent bad checksum on all the tracks. I’ve tried with and without covering the HD hole...

187 views