Denial

@eslapion, just wanted to say that the Behr-Bonz I received from you a while back was absolutely fantastic! Thank you very much :) I think I prefer it to the Penultimate cartridge... although I have noticed that they've put out a new version recently, with Cheese & Onion included. That is one im...

The following image of the die shot shows where the pot counter is, highlighted by the red box: pot_counter_highlighted.jpg The following is the logisim diagram for this section of the die shot: pot_counter_logisim.png Although it is very similar to the 8-bit horizontal counter, if you were to compa...

Really interesting development! Are you ready to put it into Verilog yet.. (I know, its a tedious language!) If you want me to put some short routines into verilog, I can certainly manage. I think when I return to using Lattice Diamond, I'll focus on implementing things in Verilog. I think Lattice ...

What I assume is happening is that POTX and POTY take turns using the 8-bit counter. Ignore the above. I have realised as I took a closer look tonight that this is a bad assumption. It would actually be quite easy for the counter to be used to measure both pots at the same time. The counter would b...

the period when the line is pulled low by the VIC is about 64µs (really 64 cycles perhaps?) For PAL, a line takes 71 cycles, which is 64µs (71/1108404). So it sounds like what you're seeing with the scope matches what the silicon appears to show, which is that it is pulled low for the duration of o...

I made a start the other day on tracing around the diffusion, polysilicon and contacts in the area of the die shot that handles POTX and POTY. Still only part way through, and I don't think we're getting near discovering anything about the jitter yet, but I thought I'd post the following image alrea...

I'd be very much interested to see this endeavour continued, especially given what has lately been found out regarding the Paddle jitter Apologies to all that I haven't been active on this project for a while. I tend to go through cycles with regards to what hobby is currently taking my interest. I...

I haven't jumped completely into Verilog yet, although I'm mostly through reading a basic introductory book and have looked over a number of cheat sheets. I'm finding that using the schematic tool within Lattice Diamond to build a module is quite educational as well, since you can then easily see w...

It is a shame that I ran into issues with Logisim Evolution. I thought I would share some of the diagrams from that effort, even though it is mostly abandoned now due to the seemingly unavoidable issue I encountered with the vertical counter. The following image is the top level VIC system showing t...

Lattice also have a few modules that makes life easier. Like SRAM and clock generation. If you want a CPU - 6561 system for example, its easy to set up an internal dual port SRAM with those and it works straight out of the box. I spent quite a bit of time reading their documentation relating to clo...

I'm starting to become more familiar with Lattice Diamond now. I haven't jumped completely into Verilog yet, although I'm mostly through reading a basic introductory book and have looked over a number of cheat sheets. I'm finding that using the schematic tool within Lattice Diamond to build a module...

I will be building a logisim diagram for the X decoder, but thought I'd do it all in one go this time. I seem to be progressing through this one a bit quicker. Despite making the above comment a few months back, I've realised now that I never did produce the Logisim diagram for the X decoder, so he...

While I'm getting up to speed with Lattice Diamond, I thought I'd post a few more alternative diagrams for sections of the die shot that I've previously covered, like I did a few posts ago with the "in matrix" logic. When I was working on the full simulation in Logisim (before encountering...

Once you start the simulator, it will continue to run. So if you launch the simulator again from Lattice Diamond, you will get two instances of the simulator. The second instance will not have a license and you will get that error.. Or maybe there is something with the installation (if you never la...

I have registered many free licenses, and it usually only takes a few minutes to get the license file. I thought I was up and running, but seems I've run into a license issue. I downloaded the install file, installed it, requested the Free license, then started working my way through the tutorial. ...