BACK TO THE PET (Commodore PET 4016 hardware demo made in 2022)

Рет қаралды 43,144

Күн бұрын

This is a playing of shiru8bit's excellent "Back to the PET" demo compo on physical hardware with amplified audio out. This is amazing software for a 1MHz 6502 microprocessor system packaged into a standalone 29KB "PRG" binary. This makes exclusive use of the "PETSCII" character set in 40x25 text mode.
This demo is presented on the physical hardware in a "dark mode" (lights off and screen focused) followed by a "light mode" (lights on and full view of the system). See 4:47 for the lights on version.
Demos like these are extraordinary forms of artwork! The original hardware system to do this was first available in 1977 (although most systems at that time did not have a full 32K of RAM and would need a CB2 mod for the audio). By mid-1980, 32K RAM became more widely available/affordable to home consumers, and the 40XX series of Commodore PET included a piezo speaker for the CB2-style audio out. Crafting this kind of audio-visual experience on such an early home-computer requires very precise understanding of the instruction set and determining very clever coding techniques to pull off the desired effects (especially also while intermixed with audio, which represents a form of multitasking).
"Back to the PET" was developed using ca65 (6502 assembler) and multiple support tools, and an emulator (called VICE) - no physical hardware was available during the development. To see how this physical hardware playthrough shown here compares with the emulator, see shiru8bit's original recording here (also with links to the original PRG and source code):
• BACK TO THE PET - a de...
Presented with permission, thanks shiru8bit!
To emphasize: I didn't create this demo, it is the work exclusively of shiru8bit. But he didn't have a physical system to run the demo on, so this is a recording to demonstrate how fantastic the results of his dev and testing on an emulator translated over to the real hardware.
NOTE: "Back to the PET" is a homage to a scene in the "8088MPH" demo for the IBM PC (CGA), both inspired by the excellent "Back to the Future" movie released in 1985 with Michael J. Fox.
In honored memory of Jack Tramiel, Leonard Tramiel, Chuck Peddle. For an outstanding in-depth paper about the PETSCII character set, refer to:
acris.aalto.fi...
For other Commodore PET related works, see also:
- Attack of the PETSCII Robots
- Destiny Hunter for Commodore PET
- Jim Orlando's excellent Commodore PET software (Defender, Lode Runner, etc.)
- Commodore Stupid PET Tricks

Пікірлер: 194

@atarixle Жыл бұрын

This is not just a demo, it is a piece of art!

@legPhase Жыл бұрын

^- this

@HelloKittyFanMan 11 ай бұрын

Nah, circular logic. All those other demos are pieces of art too, anyway.

@audiodood 17 күн бұрын

they all are

@retro101gamer Жыл бұрын

Wow amazing. Just imagine programming this back in the day and showing the head master what you've done with the school computer.

@voidstar1337 Жыл бұрын

I talked with shiru8bit, and we're going to agree that (symbolically) the three people depicted in this demo (during the "P "E" "T" scenes) are Jack Tramiel (d.2012 creator of Commodore and owned Atari after the 1983 crash), Chuck Peddle (d.2019 designer of the $25 6502 chip), Leonard Tramiel (creator of PETSCII). [ actually, spoiler: if you examine the demo source code, they're anime female models ]. But yea, a self contained PRG like this popping back in time would be an interesting parallel-universe story :D

@johnsmith1953x Жыл бұрын

Yes. this demo would make people heads pop back in 1977! Espeically its ability to predict the future computers and companies in the 1980s-1990s and onward!

@SpecialAgentBillMaxwell Жыл бұрын

That ghosting effect (more of a side effect, I guess) is super cool.

@pedazodeboludo Жыл бұрын

The persistence of the phosphorus on the display definitely makes this a lot fancier! Awesome.

@MrManniG Жыл бұрын

I had to pause the video twice to find out if its in the video or if my brain is lagging.

@FlemmingSteffensen Жыл бұрын

This is absolutely spectacular and mind boggling!! I would never have expected to see anything as great as this on the good old PET. Thank you!!!

@CaptainDangeax Жыл бұрын

Of course, the display with only PETSCII is great, but what reallty amazes me is the sound, with a single voice beeper !

@dyscotopia Жыл бұрын

This does all sorts of things that should be impossible.. And at a great frame rate. I didn't even know the PET had sound.. But I do know all those graphics are in petscii, which is just wow

@martindejong3974 Жыл бұрын

It didn't have sound, but it did have an output pin you could toggle and if you mounted an amplifier and speaker on that pin you could get sound out of your PET, the same as the Spectrum 16/48K could. many PET's were modified that way at the time.

@dyscotopia Жыл бұрын

@@martindejong3974 wow. People were circuit bending their computers in the 70s. I'd love to see a modded out pet in an electronic music performance

@NuGanjaTron Жыл бұрын

@@dyscotopia They weren't just circuit bending them; they built them from scratch (a.k.a. homebrewing). The whole personal computing scene originated from hobbyists. The big companies didn't see the market potential yet back then.

@voidstar1337 Жыл бұрын

The original PET 2001/2001-N (1977 - or really 1978) didn't come with a speaker - but it was a fairly simple modification to add one. The speaker became standard on the 40XX and later series (circa 1980) and worked using the same as the mod used on the 20XX's. So, if you come across a 40XX series PET, no mod is necessary. That built in speaker of the PET 40XX isn't very loud, but it would essentially sound the same as presented - the SNES adapter has a speaker pass-thru, used either for headphones or to amplify that same internal audio (as done here).

@JosephM101 Жыл бұрын

I heard that it was possible with extensions to add a SID chip to a Commodore PET. I have no idea if that's what's being used for this demo. Interestingly, support for a SID chip was available in the "NO PETS ALLOWED" demo. EDIT: I commented on shiru8bit's video asking what sound device they used, and they confirmed that it was the PET's internal audio.

@piggypiggypig1746 Жыл бұрын

40 years later and I'm still struggling to finish my text adventure game. Imagine this demo on the launch of the PET 4000 series.

@nama022 Жыл бұрын

Exactly. I was wondering the same about all systems - imagine the reactions at demo parties if you went there with the achievements of today's coders... I bet they would be checking the hardware afterwards. 😀

@johneygd 11 ай бұрын

Am sure if this demo existed back in 1977 and if commodore did knew about this demo ,then they wouldn’t have bothered upgrading their later hardware systems,they probably would,ve kept their later systems economically cheap as possible while forcing developers to think outside the box instead🤣

@oiuhwoechwe Жыл бұрын

first computer i ever touched in my primary school - geek teacher brought it in and cos i did well on my maths test that day (motivated by the promise of being able to use it if I did well) i got to play around with it. That was about 1981. damn, i would have melted if i'd seen that demo then. sooooo cool. this coder is amazeballs.

@Ohminen Жыл бұрын

This is so beautiful. I cried while watching.

@AppliedCryogenics Жыл бұрын

This is easily the best PET demo of all time!!

@Nicontrast Жыл бұрын

Mind blown. Thank you for showing this on original PET hardware, it is incredible to see!

@dvuemedia Жыл бұрын

If I have seen that on C64, I would be impressed, but on PET?? I'm beyond impressed! Too bad I don't have commodore PET

@Renville80 Жыл бұрын

Absolutely mind blown. Hands down, THE best 8 bit demo I’ve ever seen, considering the PET does not have bit mapped graphics!!!

@enderjed2523 Жыл бұрын

The speech bit reminds me of software automatic mouth.

@TheEmbeddedHobbyist Жыл бұрын

Same model as mine, I've had my PET since new. Did upgrade the memory to 32k just after I bought it as I couldn't afford the 32k model. Only faults so far have been a video memory chip fail. Also the mains filter went bang in the single floppy drive. Have a few videos of getting it working again. Still love to see other people showing some PET love.

@aytviewer2421 Жыл бұрын

I originally learned programming on one of these (actually a 4032 I think) and an Exidy Sorcerer back in 81/82. Such nostalgia for me and the beginnings of my love for Commodore computers. I was so thrilled to save up and purchase a VIC-20 a year or so later. It was totally awesome to be able to program at home at will instead of having to wait my turn on one of the five PETs in my school's lab. I miss those days...

@digmsymii321 Жыл бұрын

Very good video annotation. 3:13 CRT afterglow makes some effects even more effective! =)

@abodabalo Жыл бұрын

Indeed. Emulating those effects requires taday's hardware.

@digmsymii321 Жыл бұрын

@@abodabalo yep, if today is 1977.

@dbranconnier1977 Жыл бұрын

This is a very impressive demo!

@paatuc6457 Жыл бұрын

Got a lot more out of this demo with this real hardware version, thanks! :)

@djmips Жыл бұрын

All demos should be shot on the original machines.

@SchardtCinematic Жыл бұрын

Could you image the drop jaws you would have going back in time with this demo. Even if you didn't have the audio playing. The visuals alone are impressive. Put this on an office workers PET in 1978. They would probably wonder how you did it.

@paulwomack5866 Жыл бұрын

Office workers didn't have PETs in 1978!

@RetroDawn Жыл бұрын

@@paulwomack5866 There must have been *at least* one in the world.

@XYZB0RG 6 ай бұрын

makes my jaw drop even though I'm using a significantly technologically advanced computer compared to one of these. people doing amazing things with limited resources like this mystifies me

@DS-pk4eh Жыл бұрын

I was laughing hard because this looks so sureal (in most awesome way) , and I was imagining how would people react if you showed them this back in the days PET was presented for the first time. They would have fallen on the floor thinking aliens took over. Awesome.

@nama022 Жыл бұрын

WOW. Picking up jaw... Absolutely amazing.

@makipri Жыл бұрын

Cool to see other developers do PET demos these days too! And especially sample playback. I did a playback routine in 2014 for oobc’s We are computers and it spoke too. I also liked the good usage of the slow phosphorous and great design with the petscii charset.

@fixman88 Жыл бұрын

My jaw hit the damned FLOOR when I saw this. I have some familiarity with the C64 demo scene (I had one back in the 90s, it was actually the first computer I ever owned) but anything older I don't have any experience with. One of my cousins had a C64 BBS back in the 90s and he also had a PET, but he told me it had issues and didn't have it actually working.

@ExpressoMechanicTV Жыл бұрын

Brilliant piece of work. Brings back fond memories, actually. My science teacher had a PET and on one occasion, he asked me to carry out of the class room, in order for him to take it home for the night. It wasn't like carrying a laptop and I had to carry it down two flights of stairs. I was sh*tting myself! He actually lent the thing to me for a while, shortly afterwards. They were great machines, back in the day.

@notation254 Жыл бұрын

This is absolutely incredible, I can't wait to show this to my dad.

@voidstar1337 Жыл бұрын

If you prefer a "lights on" version of the presentation, go to time 4:47 Please click "Show more" near Video Description for more details.

@Studeb Жыл бұрын

The laggy display in the dark version sells it so much better, almost looks like The Matrix intro in the start.

@ExBenzi2 Жыл бұрын

Pheeeew, I can’t even begin to imagine how much effort and clever trickery it must’ve taken to do all this on a machine that hasn’t even got support for hardware sprites… Insanely well done. Nice.

@djeasy5899 Жыл бұрын

I am thrilled. To find theory and creativity combined without narcissism in the executing subject is very rare. This may sound strange, but it always makes me think somewhat optimistically about people. Thanks for this

@jean-philippegrenier120 6 ай бұрын

Absolutely stunning. And thanks for showing us the go hardware run it!

@c64os Жыл бұрын

Sublime. Nice work!

@BoGy1980 Жыл бұрын

you'd love the demoscene mate .. i lived in that time .. 80s and 90s ... not a coder myself, but i always enjoyed the demo's.. had a c64 and thousands of floppies, made tons of money by copying those ofc :) was quite an income for a little kid :)

@38911bytefree Жыл бұрын

I love how as the years go by, the limits of what seem impossible for these classics, get surpassed over and over again. Kudos to the programers !!!!!!! Seen stunning thing for the 64, but for the PET ????. CRAZY stuff !!!!!

@chironbramberger Жыл бұрын

Great video! You've got my PetSynth on that disk, haha! One of these days I need to release a new version!

@voidstar1337 Жыл бұрын

That guy circuit bending his PET while using PETSynth was one of the things that motivated me to bring my PET back out! Great stuff.

@chironbramberger Жыл бұрын

@@voidstar1337 Yeah that was “Look Mum No Computer” and he was trying to overcome a hardware limitation of the PET in terms of making bass tones. My original software was a very quick and dirty program to make the PET make enough interesting music that I could sample it and make some instruments that I could use within Logic. I made a second version but it was janky and I never felt it was good enough to release. I’ve worked on it some more and even have a version for the original Nintendo but it’s still only proof of concept. But when I finish what I’m working on now maybe I’ll focus on PetSynth again!

@NuntiusLegis Жыл бұрын

I have a green monitor on one of my C64s, but it doesn't produce such an incredible glow. Beautiful.

@C64EVO Жыл бұрын

Can’t lie, kinda love this demo! The PET was my first hands on computer in elementary school. Remember lunar lander and some trajectory launcher game and maybe a text adventure, but this is some “Other Level” stuff… really nicely linked and orchestrated… cheers to all involved in making it!

@decle Жыл бұрын

Nice! The phosphor persistence is the icing on an excellent cake. 👍

@douro20 Жыл бұрын

I just saw a CBM 8032 at the flea market today. First time I have ever seen anything PET related I could remember. And I'm in my late '30s.

@greendryerlint Жыл бұрын

Did you buy it?

@neonvoid Жыл бұрын

Looks amazing on the green CRT.

@flottenheimer Жыл бұрын

Beautiful, incredibly stylish work. Such an achievement. Bravo! 🔥🔥🔥

@commodorecave5581 Жыл бұрын

Incredible! ... just incredible!

@HelloKittyFanMan 11 ай бұрын

WOW, really great to see something like this being done on the first model series of computer that I ever touched!

@CyberhugTechnologies Жыл бұрын

Absolutely wonderful demo! Thanks!

@nicholasharding8817 Ай бұрын

Wonderful. Absolutely love it.

@stimpyfeelinit 7 ай бұрын

i love the art at 1:46 its incredible 😍

@espacemaxim Жыл бұрын

Just awesome!!!

@discharge2331 Жыл бұрын

Mindblowing !

@Andyzzzz501 Жыл бұрын

Wow, just wow, mind blown, I wrote a lot of code on my old VIC-20 which didn't really have true graphics although one could reprogram custom characters. if memory is correct, the PET is even more pedestrian than the vic-20 in its capabilities, so this is absolutely amazing, and yes, a lot of clever tricks and creativity with the special characters, but some of the effects I have no idea how it was done! Brilliant! Made my day!

@harihegen Жыл бұрын

Absolut beeindruckend was auf dieser Maschine möglich ist! Großartig!

@idreamtin8bits Жыл бұрын

Wow! Spectacular demo.

@JustWasted3HoursHere Жыл бұрын

Pretty darn impressive for just PETSCII characters and a beeper piezo speaker for sound!

@exquizitely Жыл бұрын

That was awesome!

@fungooloo12 Ай бұрын

I played games on a friends PET back in the 80's. He had no sound directly from the PET so we had to tune a radio sitting next to the PET to actually pick up a radio signal, some interference, from the PET to hear sounds, it was pretty rough but it worked.

@espfusion Жыл бұрын

Some really wonderful PETSCII art.

@cosmicavatar773 7 ай бұрын

This is amazing, could you imagine if you would of played this demo for people back in the 70s!

@uriituw 2 ай бұрын

That’s mind blowing.

@reaktormannen Жыл бұрын

Really cool! Well done :)

@idadru Жыл бұрын

3:16 that effect looks dope!

@JulianMelville 11 ай бұрын

That's incredible. A 4016 was my first computer, and I could never make it do that!

@rafalwronowski1893 Жыл бұрын

To Demo urywa jaja totalnie. Bardzo dobry material

@EricBarbman 8 ай бұрын

This is amazing :O

@MrLocsei Жыл бұрын

wow absolutely amazing I used to have a c64 back in the days in fact it was my very 1st computer :)

@ItBusinessyoutube Жыл бұрын

Absolutely fabolous !!

@RetroGadgetMan Жыл бұрын

Speechless!👌

@colintroy3831 4 ай бұрын

Light bleed + ghosting 😍

@StormsparkPegasus Жыл бұрын

It's always amazing what demoscene coders can do on these old machines when they have access to modern development tools.

@SixOThree Жыл бұрын

First bit of 40 column software I've wanted to run on my 8032.

@PSL1969 Жыл бұрын

Wow! That's amazing! One of the best demos ever made!

@johnwells558 Жыл бұрын

I wish i still had my PET

@danield.7359 Жыл бұрын

Incredible

@diamondsnake1273 Жыл бұрын

Amazing 😍

@trooperj9152 Жыл бұрын

Wow! Just Wow! 😲

@PeterBudai Жыл бұрын

Awesome!

@shaurz 11 ай бұрын

Very creative effects

@KanalFrump Жыл бұрын

lovely phosphor glow.

@jovanfilipovic Жыл бұрын

If it wasent for the picture of pet screen i would think that demo is not runned on pet.... ITS ABSOLUTLY AMAZING !!!!!! mindblowing. greetings from serbia. john

@jali7913 Жыл бұрын

I sometimes wonder, how it would be, if you could go back through time to the year 1977 and show one of the programmers back then, what's really possible with these machines. We watch it in 2023, knowing what more advanced computers can de, and we are mind blown. Imagine how someone from 1977 would feel!

@AlexanderKurtz Жыл бұрын

Awsome

@Jmdeclue Жыл бұрын

Brings back memories. We had 8 of these with 8” floppy drives in my grade school computer lab. Probably ‘82-‘84. Felt like I was right back in 7th grade.

@egriimre Жыл бұрын

Wow, great demo, the phosphor lag adds a lot to the style :)

@Steman313 Жыл бұрын

The c64 was the first computer that I owed and watching this now really does make me appreciate what I have now

@xcoder1122 Жыл бұрын

One has to keep in mind: The PET could not display graphics at all, only text. All you see in this demo is made with text characters. Sure, the PET did not just have numbers and letters, it also had characters that resembled lines and small blocks but even if you search for PETSCII to get a table with all these characters, it's still insane to make such a demo just using only these characters.

@shiru8bit Жыл бұрын

@KZfaq WantsToSilenceMe PET does not feature a loadable character set, it is burned into the ROM, so no, this is completely standard set in action, no customization there.

@LeonardoRamos-jz5uw Жыл бұрын

You have no idea how difficult it was to compile music without a piano keyboard interface. I was so excited when dad bought me the synthesizer chip. I was only able to get one note going. Plus it was not in Do re mi, I never was able to get the c d stuff right.

@seattlematt1976 Жыл бұрын

A f**king masterpiece.

@Daemonarch2k6 Жыл бұрын

Incredible, bet these guys could program impressive demos on 70's calculators.

@hakureicirno6059 Жыл бұрын

People have programmed demo for Soviet era telephones as they have Z80 processors inside.

@merman1974 Жыл бұрын

That is so impressive!

@CYON4D Жыл бұрын

Awesome.

@carlkontermann5637 Жыл бұрын

You are wizards!!

@CaptainCattywampus Жыл бұрын

Don't forget... It took modern computing for us to realize the full potential of these older machines. Back in the day, we would say this is hardly possible, especially without all of this modern bootstrapping. Even so, this demo is very entertaining. It doesn't serve any real practical purpose, but does offer great feelings of nostalgia, being a computer I actually touched when it was relevant.

@voidstar1337 Жыл бұрын

If you had access to a mainframe with a decent editor and a 6502 assembler and emulator, then you might have a chance. And that's not so different today -- no one develops directly on an MCU (like an ESP32 or Arduino), we always use the "big computer" to do the (serious) development and transfer the final binary product over. But you're right, modern computing has made editing code easier, running the assemblers faster, and searching up technical info so much more efficient.

@ataritufty Жыл бұрын

Amazing

@frejadraco9409 Жыл бұрын

Impresive!

@suadcokljat1045 Жыл бұрын

Nicely done. Cheers! S

@bigredracingteam9642 Жыл бұрын

This is awesome!

@seraphinberktold7087 Жыл бұрын

Back then I've never seen any PET computer at our school do anything remotely as cool as this. 😎 Might have kept the Schneider (aka Amstrad) CPC computers at bay for some time. These replaced the PETs in 1985 IIRC.