Spectrum Computing

Check this post:
viewtopic.php?p=97355#p97355

You can't post private communications (such as emails) on a public site. Especially now, with privacy regulations adopted in most countries.

I get the first location with a flashing cursor but I can't move it. What are the keys ? Does it use mouse?
The graphics could be much better - there's good autoconversion software around, but more on that later. For now, I'd just like to be able to click on something...

The Spectrum generates an analog PAL signal, with colours very similar to test pattern generators common at that time. If you look at the EBU/IBA colour bars (https://en.wikipedia.org/wiki/EBU_colour_bars) you find a similar 100% / 75% luminance set of saturated RGB bars. That's similar to the Spect...

Indeed, it might be a colour space /colour profile issue. The default colour space format for internet images is sRGB, but that's an old standard. Many devices now use wider spaces, and browsers / operating systems will convert them for display. For example, here's a colour cube encoded as sRGB: htt...

Try searching for stuff on the US National Archives: https://catalog.archives.gov/search?q=%22apple%20II%22 It doesn't live up to the expectations, and I'm sure they have more money and people :lol: In short "Why" is because the manpower and time required are outside the scope of an amateu...

Some reason for the alternate palette used on these screenshots? Did the Spectrum look like this when connected to a SECAM TV ?

Some trivia about emoticons and graphical Unicode characters. Some early smilies ( ☹ ☺☻ ) were codified back in 1991: https://en.wikipedia.org/wiki/Miscellaneous_Symbols Emoticons are implemented in Unicode since 2010: https://en.wikipedia.org/wiki/Emoticons_(Unicode_block) https://en.wikipedia.org/...

Semigraphics Very interesting to see french software! They had original and imaginative titles, at least for other machines.

Ground Attack fixed

We have non-spectrum software already (Jupiter Ace), don't think it's a problem. And a few CP/M titles are already listed.

But I agree that having many titles as regular +3 software might be confusing. We might need a new hardware category, perhaps "+3 CP/M" ?

You need to handle image display on your end, as ZXDB will only provide relative paths and in most cases native formats. Each ZXDB site/app handles paths and image conversions differently, with custom solutions as needed. Linking to existing sites is not a good practice, because of increased traffic...

I'll let Einar answer, but let me add that some running screens are also SCRs. In some cases, other spectrum formats are used in order to preserve multicolor information.
This is done from a preservation point of view, as we are interested in storing all of the original data to the bit level.

Check ZX-Image:
PHP-based ZX Spectrum images parsing into PNG/GIF. Supports animation, supports file caching.

https://github.com/moroz1999/zx-image

PeterJ wrote: ↑Thu Mar 24, 2022 8:22 am @Juan F. Ramirez,

The quality of the map in Mapgame is excellent.

Both the physical and regional maps are quite good.

Simply design Spectrum compatible graphic assets (respecting attributes and palette) but disregard any limitations for scrolling or sprite animation.

Brilliant graphics and smooth gameplay. Really good!

Very interesting!
Having programmed a similar app, I recommend measuring colour distances using non-RGB colour spaces. Will come in handy when you dithering across attribute cells. You can consider each cell as having its own 2 colour palette. It's the only way to get decent results

Very interesting!
Can be taken a step further: saving/loading the memory dump as a PNG so you can edit graphics.

"cámara" here means chamber
It usually means a photographic camera, but not in this context.

In Portuguese, the word is similar ("câmera") and has the same meanings.

Conceptually the pixels are square. The TV signal was generated with this assumption in mind: generate a 4:3 central area made up of square pixels. There were some minor deviations (like white/black not having exactly the same dimensions) but they are too small to notice. To avoid any confusion betw...

Very good work!

But clashing with the red girders would be horrendous. I think the key is to accept colour clash and minimize the effect through a good choice of colours. » White/yellow, red/magenta or black/blue have low contrast between them, so clashing between these is not problematic. » Yellow/cyan don't cont...

There's a trick for upscaling to uneven factors and partially retaining the pixel art look ;) First, you do a large nearest neighbor upscale, to 400% or 600% of the original size. After that, you do a normal downscale (using normal interpolation/anti-alias) to the desired arbitrary size. 100% Origin...

The simplest approach is to consider square pixels and use integer scaling - 1x, 2x, 3x, etc. Interpolation on both axes is problematic, because that's not how CRTs worked... CRTs displayed a raster image, with some value averaging along each line - a sort of horizontal "pixel" smearing - ...