Home example 2 – Page 9 – 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

Amiga Floppy Inactive

created testbench for state machine / block ram tester

So tonight I fooled around with ISIM, which is Xilinx’s simulator. I was doing behavior simulation and wrote a small testbench for the block ram state machine that I wrote a few days ago. Really neat stuff...

265 views

Amiga Floppy Inactive

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...

259 views

Amiga Floppy

sync’ing to the 0x4489 0x4489

Well, this wasn’t as easy as I first imagined. There are some issues: 1> By the time you’ve detected the 4489 4489, it’s too late to do much about it. This is because I’m writing one bit at a...

259 views

A501 Replacement Inactive

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...

258 views

Amiga Floppy

SX microcontroller with 74HC132

Here’s a picture of the prototype coming together. From the top down on the breadboard, you see a pull-up resistor, on the input that comes in on the yellow wire. The output comes out of the grey wire on the right...

256 views

Uncategorized

Update to Rigol CSV to OLS file conversion post

A couple years ago I posted some information on how to convert a Rigol CSV to an OLS File. I recently got a request for some more information. So let’s look at the two files First twenty lines of the Rigol CSV...

254 views

A501 Replacement Inactive

Testing shows databit 10 is always stuck high on commodore amiga expansion

With help from Ralf on this comment I was able to Disable the memory by no-longer grounding PIN 32, and sometimes forcing CE high on the SRAM chip. Boot a workbench disk, and then break it on startup. Insert a disk...

253 views

Uncategorized

my minimig with 4mb upgrade and ARM controller

Finally got some time to play with minimig!
Of course there’s a great community at .

253 views

Badge Computer

Trying to debug my design for an Audio DAC Cirrus Logic CS4334

I purchased a CS4334 to eventually use as an Audio DAC for the badge computer. I’ve never worked with DACs before, and my knowledge of audio is somewhat limited. This audio DAC is a Cirrus Logic CS4334 with...

236 views

Badge Computer

SRAM Frame Buffer is now up and running!

Exciting times for the Hope Badge Computer. Tonight, I’ve worked out most of the kinks with interfacing the new SRAM module which you can see in posts below this, to the J68 soft-core CPU. This means that I can...

233 views