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

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...

282 views

Badge Computer

J68 boots VUBUG monitor on the BEMICRO MAX 10 FPGA board

Here’s an image showing a ROM monitor VUBUG running on the J68 softcore, which is in turn running on a BEMICRO Max 10 FPGA board.
VUBUG will be used until we can get our own (unwritten, so far) custom code booting!

271 views

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...

266 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...

262 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...

261 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...

258 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...

256 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 .

254 views

Badge Computer

move.w vs move.l: The culprit of my circle problems

If you saw my recent post about malformed circles, you’ll see that I was pulling my hair out. I identified the root cause. It turns out that I was writing 0x00000fff, which caused the pixel I was setting to be...

254 views

Oscilloscopes and Logic Analyzers

Couple hi-res images of 16902A mainboard

I just recently added another HP/Agilent logic analyzer to my collection. This time it is the 16902A. I needed to remove the CPU tray to replace the IDE HDD with a SATA SSD. As a result, I figured I’d take couple...

244 views