seban - Network

Obviously, I first heard this track in the end scroll of the Amiga demo Full Moon.https://demozoo.org/productions/5783/

Obviously, I first heard this track in the end scroll of the Amiga demo Full Moon.

https://demozoo.org/productions/5783/

Today, a little retrospection. Back in the '90s, I had no idea this track: https://demozoo.org/music/29010/ Was actually a cover, and...

Today, a little retrospection. Back in the '90s, I had no idea this track: https://demozoo.org/music/29010/

Was actually a cover, and the original was composed by Jochen Hippel: https://demozoo.org/music/162896/

Today, I came across this remix by Moonshine Fox: https://remix64.com/track/moonshine-fox/a-prehistoric-tale-main-theme-atari-inspired-version/

Turns out Mr. Jogeir also made another remix: https://remix64.com/track/jogeir-liljedahl/a-prehistoric-tale/

I wonder how many in the '90s knew Jochen Hippel composed the original?

#demoscene #Amiga #AtariST #remix #cover #JochenHippel #MadMax #Trackermusic

Some spare parts are left! :D They will wait for better times—maybe for the resurrection of another Atari 2600? :DSo that's all for...

Some spare parts are left! :D They will wait for better times—maybe for the resurrection of another Atari 2600? :D

So that's all for today! :D But the queue of 'little projects' is not empty... so soon (I hope!) there will be another little diary-style entry. :)

🧵 9 of 9

It's time to clean up the board, remove other unnecessary components, and finish this little weekend project. RZoG designed a very nice...

It's time to clean up the board, remove other unnecessary components, and finish this little weekend project. RZoG designed a very nice connector housing and then printed it on a 3D printer... it fits perfectly! :)

🧵 8 of 9

The colors are crisp and vivid! :D So I think the mod was a success!🧵 7 of 9

The colors are crisp and vivid! :D So I think the mod was a success!

🧵 7 of 9

Ha! It looks quite promising! :) The video quality on a low-budget TN LCD monitor is clean and sharp! :)🧵 6 of 9

Ha! It looks quite promising! :) The video quality on a low-budget TN LCD monitor is clean and sharp! :)

🧵 6 of 9

The new PCB is now connected and placed in the old RF modulator's location, so it was time for some tests and to check the video signal...

The new PCB is now connected and placed in the old RF modulator's location, so it was time for some tests and to check the video signal quality...

🧵 5 of 9

The next step was to connect the new audio-video board, but first, I needed to prepare a cable with the required signals from the TIA...

The next step was to connect the new audio-video board, but first, I needed to prepare a cable with the required signals from the TIA chip...

🧵 4 of 9

The next step was to remove the RF modulator and take some measurements. There were more components to remove, including the audio...

The next step was to remove the RF modulator and take some measurements. There were more components to remove, including the audio subcarrier generator and the onboard chroma-luma mixer...

🧵 3 of 9

... I decided to design a small PCB with a new luma DAC, chroma amp, and audio buffer. The PCB arrived some time ago, so it was a good time...

... I decided to design a small PCB with a new luma DAC, chroma amp, and audio buffer. The PCB arrived some time ago, so it was a good time to open the 'victim'...

🧵 2 of 9

Some time ago, @RZoG asked me to mod his Atari 2600 Junior (PAL version) to have an S-Video output, so I had the Atari 2600 on my bench over...

Some time ago, @RZoG asked me to mod his Atari 2600 Junior (PAL version) to have an S-Video output, so I had the Atari 2600 on my bench over the weekend.

🧵 1 of 9

#atari2600 #retrocomputing

It was a great pleasure and honor for me to uncover the secrets of this system after so many years! I have great respect for the people who...

It was a great pleasure and honor for me to uncover the secrets of this system after so many years! I have great respect for the people who created it. I’m glad I could preserve the hardware! Many thanks to Thomy for sharing the device!

Photo of the manual (in Polish):

🧵 19 of 19

Unfortunately, more primitive but cheaper solutions prevailed. The system didn’t gain as much popularity as other turbo systems that...

Unfortunately, more primitive but cheaper solutions prevailed. The system didn’t gain as much popularity as other turbo systems that appeared on the market a little later. The designers of this interface and its software can undoubtedly be called the pioneers of their time!

🧵 18 of 19

It was one of the few systems that, while achieving high speeds, still used serial transmission supported by the POKEY, so the screen...

It was one of the few systems that, while achieving high speeds, still used serial transmission supported by the POKEY, so the screen didn't need to be turned off during loading to gain extra cycles for the 6502, as was the case with other turbo systems

🧵 17 of 19

It's one of the most powerful interfaces for Atari 8-bit computers from the late '80s that I have seen. The design is interesting...

It's one of the most powerful interfaces for Atari 8-bit computers from the late '80s that I have seen. The design is interesting and well-thought-out, and it works great. The new data format, without IRG gaps, allowed for even greater efficiency. It was a comprehensive and complete solution!

🧵 16 of 19

I was wondering why the designer of this interface used such an extensive band-pass filter. I got my answer when I saw the signal spectrum...

I was wondering why the designer of this interface used such an extensive band-pass filter. I got my answer when I saw the signal spectrum during transmission at 2600 bps - it is so rich in harmonics that the use of a filter became a necessity.

🧵 15 of 19

This is a two-stage, 2nd-order low-pass filter (fc ≈ 6680 Hz) and high-pass filter (fc ≈ 2950 Hz), which together form a 4th-order...

This is a two-stage, 2nd-order low-pass filter (fc ≈ 6680 Hz) and high-pass filter (fc ≈ 2950 Hz), which together form a 4th-order band-pass filter with a frequency range from 2950 Hz to 6680 Hz. To verify the calculations against reality, I measured the filter characteristics; here they are:

🧵 14 of 19

Since I started the description of the interface from its end, i.e., with the FSK demodulator, it’s now time to present the final part of...

Since I started the description of the interface from its end, i.e., with the FSK demodulator, it’s now time to present the final part of the schematic: the input circuit, which consists of an emitter follower and a built-in system of bandpass filters...

🧵 13 of 19

The interface designer therefore decided to use inexpensive domestic low-noise transistors, type BC149/BC159, which were manufactured by the...

The interface designer therefore decided to use inexpensive domestic low-noise transistors, type BC149/BC159, which were manufactured by the domestic semiconductor factory (CEMI). Most of the components, including TTL ICs, used to build the interface were also manufactured in Poland.

🧵 12 of 19

One might wonder why so many transistors were used instead of an op-amp or a comparator, but it should be noted that in 1988, in Poland, it...

One might wonder why so many transistors were used instead of an op-amp or a comparator, but it should be noted that in 1988, in Poland, it was difficult to obtain an operational amplifier that would work correctly with a single +5V supply voltage.

🧵 11 of 19