One of the best box art designs of all time

Voidscan Glitch Art Art by Voidscan

Did you know I keep all my glitch art here?

Glitch.voidscanmusic.com

#glitch #glitchart

Sketch page of a mouse and cat heads

Doodles
#art #ink #doodles

I still have the floppy disks full of WAV files I used with it in windows 3.1.

Digital hoarder.

hi #portfolioday
long time no time
i make #pixelart

Microsoft had an official PC Speaker driver. It would run on far less than a 486, but it would freeze your system while sound was playing.

No, there is a computer with worse audio, believe it or not.

The Sanyo MBC-550 just has a 'buzzer'. It cannot play square wave tones, they just hooked the serial UART up to the speaker so you get a sound like an angry badger being tasered

Last week my demo group won the 1st place at REVISION with the eponymous PC demo "Razor 1911": A 10 minutes long coded audio-visual journey thru different eras to celebrate 40 years of activity in demoscene.

www.youtube.com/watch?v=2Anb...

SPREAD THE CODE
LONG LIVE THE SCENE

That's quite similar!

been a while since I posted ol' Wolf, yeah? (his name is Wolf)

#art #pixelart #animation #oc

recreated an old LED display hack of mine. each color channel is its own world of conway's life. instead of erasing cells, phosphor is emulated. there are snakes, if a snake from one color channel encounters a cell from another, it grows and changes the cell color.

Composite Mod from Scratch: Atari's Pong Sports IV If we’re doing all these pong articles, we might as well get a real, authentic, Atari Pong. So much like with their Pinball, we’re not, but are doing the nex...

Yes! that was actually the inspiration for this idea, when I ran across Nicole Express's blog post on the Atari Pong Sports IV console:

nicole.express/2024/super-d...

So the final step was to add a triple NOR gate, a 74LS27, that detects when the separate digital R, G, and B components are all 0. That triggers a 74LS157 multiplexer to kill the chroma clock. This preserves the black areas as black.

To achieve the full, smooth gradient, we just skipped over all of the color clock generation circuitry and injected our custom color clock directly at the resistor that feeds into the composite DAC circuit for the chrominance input. This creates the desired rainbow, but looks a bit washed out.

I did try overriding the source clock, but it caused some instability in the picture. So best to leave that alone. We can drive the color clock however we want, however the NTSC color carrier is exactly 1/4th of 14.31818MHz, so effectively we are limited to a maximum of 16 colors, no matter what.

In the first image, I was injecting the clock at the start of the CGA's "composite color chain", two 74LS74 flip-flops that create six NTSC-compatible color clocks. The problem is that these flip flops, representing 3 separate units, are all clocked by a 14.31818MHz source clock.

here's an explainer for what's going on in this first image. All of these tricks involve clock injection - disconnecting an internal clock source and substituting it with an external clock. In this case, a clock generated by an STM32 microcontroller.

A photo of the same modified CGA card showing a 40 column directory listing and C:\> prompt, with the color spectrum overlaid across the text.

A screenshot of AlleyCat running in composite CGA on a Commodore 1084D monitor. The card has a modification to cause its composite color clock to roll out of phase every scanline, producing a rainbow spectrum horizontally across the screen.

Decided to let it walk over white, simply because a rainbow text mode is cool. Squashing output on black though makes it pop well enough.

No VGA and no problem!

I like the previous effect having white "pop" - so I think the final version of this modified "Rainbow CGA" card will end up preserving white. We just need to sneak a multiplexer in there somewhere.

A Commodore 1084D monitor displaying the PC game AlleyCat in composite video. The normal colors of the game have been replaced by a rainbow spectrum. The game itself is still visible via the luma component of the composite signal as slightly lighter and darker areas of the rainbow.

Turns out if we bypass the digital color clock generator entirely, we can just inject a custom color clock right at R8 in the composite output circuit.

#retrocomputing

Yep

A Commodore 1084D monitor showing the PC game AlleyCat running in composite video from a slightly modified CGA card, receiving a custom color clock input from an Arduino.

I bet you've never seen AlleyCat look quite like this before.

#retrocomputing

No graphics? Hercules!

A DOS C:\> prompt with a blinking cursor, as seen through a composite video signal on an oscilloscope.

Heliopolitan (@heliopolitan@mastodon.social) Attached: 1 video My Psion Series 7 is now *fixed* - temporary fuse bridging, awaiting a replacement 750mA fuse. It joins the happy ranks of @thelastpsion@oldbytes.space's Netbook in being fully oper...

I have a very minimal presence over on #Mastodon, but sure why not take a wee hop across and see my post about my repaired Psion Series 7 computer from the early 2000s? #Permacomputing #Retrocomputing #Psion #RightToRepair #DistractionFreeWritingDevice
mastodon.social/@heliopolita...

Ideally you want both - you want a fast hardware latch, which I believe on the C64 is done by the CIA chip, and then you want an interrupt telling you that the pen position is ready to read.

Also, an interrupt may be too slow. The card needs to latch the position instantly.

The 74ls93s are binary counters. It is decoding the composite signal and resetting the counters on hsync and vsync.