How did you repair the PCB? You drilled out the hole and inserted a new metal tube (the eyelet?) into the hole? I've never heard of anyone doing this before. If that's the case you may be shorting the internal ground and power layers in the PCB sandwich. I may have totally misinterpreted what is goi...

Hi HigashiJun, youkoso.

I hope your restoration goes well, please post some photos when you have some progress!

kludge asked "could this work on Amiga"? Not really. I had a look at Atari schematics and it looks like 3 lines from the shifter for each color. The Amiga 1200 has 8 lines for each color coming out of the Lisa chip (which is why Indivision and other scan doublers connect over the top of the Lisa, t...

Bad solder joint in one of my bodge wires apparently. Sorry for the pointless questions

Awesome, thanks for the feedback guys! The quality of the colour image through the same cable is amazing, so I'm going to rule out my cable as the problem, and suspect that the FPGA itself (i.e. my code) is doing something wrong.

Iirc, on the ST (but not on the STe), a BLANK signal is generated even in mono mode, but it isn't used for anything. I remember posting something about it to AF, but, alas, it's still off-line. Hmmmmm that's basically what I thought as well. I guess the question is, am I the only person who gets th...

Maybe this can help? http://powerphenix.com/rodolphe.czuba.free.fr/Museum/ST_Shifter.jpg Thanks, that's perfect. It looks like it confirms my hazy memory that hsync comes very close after the end of the pixel data at the end of each scanline. In mono, we have 224 cycles (28 uS) and 160 of those are...

This is monochrome passed through the scandoubler (not through the original ST monitor port though, yet): scandoubler2-mono1.png There is some kind of random noise in the image, which you can see toward the bottom of that pic. Where the noise is and what it looks like depends on what image is displa...

Hmmm. My 13.0sp1 (64 bit) happily creates configs (Ubuntu 18.04 and Debian testing that I both hesitate to upgrade) for my Cyclone II devices here. Ahhh you're right, it was 13.0sp1... I thought I got that info off Intel's site, but perhaps I made some mistake. Well, either way, same problem - if i...

You can create your own TOS E00000 decoder with a GAL16V8 and some old schematics IIRC. I also found a document that explains how to do it with 3 logic ICs, which seems straightforward (https://tietokone.ntrautanen.fi/atari/suomen.atari.org/stklubi/93/93_02/jutut/tos206up.htm). I can probably set i...