Nice. I always loved Ms Pacman on the Apple II for a slightly garish but effective polyphonic playback of music before the game starts and polyphonic SFX while the game is running!
Wow. Thanks for this. I just learned a ton about sound and seen things I would have thought impossible on the Apple II. In fact, I just understood why my emulator won't be able to reproduce some of those sounds, as emulating the carrier modulation needs full rethinking of the sound emulation. But at least, I have a better understanding now.
@@ForgottenComputer There is an article on the internet in english : "A lesson involving 'CRACKERS' (APPLE II)" by Olivier Crepin-Leblond. If you can translate french, you could also read this site : ctrl.pomme.reset. Lots of article about french crackers and the demoscene (yes, there is a demoscene on the Apple II, historically and still very french). If you read this, i would be happy to have your feedback on this. Have a nice day.
Kuba I’m always happy to hear your praise and criticism :) A fee more videos are already in the queue, can’t wait to record them. ZX Spectrum will be first I think. Dzięki za wytrwałe oglądanie tych filmików!!
I have a question. I'd like to know what's the response of the Apple2 speaker when current is put on. That is, how long does it take for the membrane to reach its maximum position when tension is applied... Do you know that ? I ask because I'm thinking about writing a sound emulation and I'd like to know if the idealised square wave we look at is real or if the speaker introduces some artifacts... Thanks !
Hi, thanks for visiting!I have read about 60 microseconds response, but never tested that number myself. Actually it would be a cool idea to test it one day. And yes the speaker does introduce distortions to square wave; but what distortions and how one can control them - that's an interesting subject in itself to explore. Let me know if you are able to progress; I'd love to test the exact speaker responses one day. Also, I'm sure someone has done proper research on that already.
@@ForgottenComputer Ok. I'll tell you when my emulation can reproduce at least something. Then, I'll be facing the problem of how to measure the response time given that 1/ I don't have microphone 2/ I don't have an AppleII :-) If I told you about that it's because you seemed quite knowledgeable and that you had all that *it seems* to be needed to make the measurement :-) Now to be honest, I'm no sound engineer (more in compsci and some maths) so maybe my idea about how to record that is quite naive. But now that you gave this 60e-6 seconds ballpark measure, it means that it can't be recorded with a 44Khz microphone. Now, if we make thousands of recordings, maybe we can gather enough information to rebuild the original signal. I should try that at home first :-) (but I'm sure Shanon will come in to say no at Thanks for answering !
@@stefanc6183 If time allows I'll try to take measurements myself. Remember that delays in signal journey are not in the speaker only. Have a look at my ZX Spectrum video where I dig into the delays between where signal originates and where it ends.
@@ForgottenComputer That'd be great, but there ain't no stress. Writing emulator is not exactly my professional stuff so I'll need time too. I'll let you know when I'm ready to use your measurement. So be cool :-) But that'd be great to investigate this, just for the fun of it...
@@ForgottenComputer If you're interested, I've finally managed to "record" the sound out of my emulator (which hopefully is correct). The recording is done at the CPU frequency (about 1MHz) and uint8 (0 or 255) accuracy. I've recorded Archon's music which is about 200kb compressed... Now the question is: how could we resample that from 1Mhz down to 44.1KHz ? 🙂 Right now I'm looking at a "Kaiser" filter and some FFT. But it still doesn't work...
This was a joy to watch. Thank you.
Thank you for watching and for the kind words Brett!
Nice. I always loved Ms Pacman on the Apple II for a slightly garish but effective polyphonic playback of music before the game starts and polyphonic SFX while the game is running!
Wow. Thanks for this. I just learned a ton about sound and seen things I would have thought impossible on the Apple II. In fact, I just understood why my emulator won't be able to reproduce some of those sounds, as emulating the carrier modulation needs full rethinking of the sound emulation. But at least, I have a better understanding now.
French crackers productions (The Luck Jim). The scene was still really active in the beginning of the 90s (on the Minitel). Nice video.
Thanks for visiting! Can you tell me more about this? Any writeup I can read?
@@ForgottenComputer There is an article on the internet in english : "A lesson involving 'CRACKERS' (APPLE II)" by
Olivier Crepin-Leblond. If you can translate french, you could also read this site : ctrl.pomme.reset. Lots of article about french crackers and the demoscene (yes, there is a demoscene on the Apple II, historically and still very french). If you read this, i would be happy to have your feedback on this. Have a nice day.
Great video very informative apple 2 I have never had a chance to play mabe in the future
Very informative great video!
Thanks. Looks like you have a few interesting videos in your channel. Subscribed, and will watch them...
@@ForgottenComputer Thank you!
Yours material Adam should be presented on Polish technology universities! Great job. Seriously.
Kuba I’m always happy to hear your praise and criticism :) A fee more videos are already in the queue, can’t wait to record them. ZX Spectrum will be first I think. Dzięki za wytrwałe oglądanie tych filmików!!
GREAT VIDEO , thank you, try listening to the opening theme of the game ARCHON.
Have you heard Music Maker on the Apple II by subLogic?
Yes, Maple Leaf Rag which is featured in this video is by subLogic and was made on Music Maker :)
@@ForgottenComputer ah, nice. Yeah that Music Maker demo disk blew me away with its sound and graphics. Thx for this video.
Ah-ha! Oscilloscope closeups - nice
But I'm not super happy how they came out. Need to work on that.
I have a question. I'd like to know what's the response of the Apple2 speaker when current is put on. That is, how long does it take for the membrane to reach its maximum position when tension is applied... Do you know that ? I ask because I'm thinking about writing a sound emulation and I'd like to know if the idealised square wave we look at is real or if the speaker introduces some artifacts... Thanks !
Hi, thanks for visiting!I have read about 60 microseconds response, but never tested that number myself. Actually it would be a cool idea to test it one day. And yes the speaker does introduce distortions to square wave; but what distortions and how one can control them - that's an interesting subject in itself to explore. Let me know if you are able to progress; I'd love to test the exact speaker responses one day. Also, I'm sure someone has done proper research on that already.
@@ForgottenComputer Ok. I'll tell you when my emulation can reproduce at least something. Then, I'll be facing the problem of how to measure the response time given that 1/ I don't have microphone 2/ I don't have an AppleII :-) If I told you about that it's because you seemed quite knowledgeable and that you had all that *it seems* to be needed to make the measurement :-) Now to be honest, I'm no sound engineer (more in compsci and some maths) so maybe my idea about how to record that is quite naive. But now that you gave this 60e-6 seconds ballpark measure, it means that it can't be recorded with a 44Khz microphone. Now, if we make thousands of recordings, maybe we can gather enough information to rebuild the original signal. I should try that at home first :-) (but I'm sure Shanon will come in to say no at Thanks for answering !
@@stefanc6183 If time allows I'll try to take measurements myself. Remember that delays in signal journey are not in the speaker only. Have a look at my ZX Spectrum video where I dig into the delays between where signal originates and where it ends.
@@ForgottenComputer That'd be great, but there ain't no stress. Writing emulator is not exactly my professional stuff so I'll need time too. I'll let you know when I'm ready to use your measurement. So be cool :-) But that'd be great to investigate this, just for the fun of it...
@@ForgottenComputer If you're interested, I've finally managed to "record" the sound out of my emulator (which hopefully is correct). The recording is done at the CPU frequency (about 1MHz) and uint8 (0 or 255) accuracy. I've recorded Archon's music which is about 200kb compressed... Now the question is: how could we resample that from 1Mhz down to 44.1KHz ? 🙂 Right now I'm looking at a "Kaiser" filter and some FFT. But it still doesn't work...