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#commodorepet

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MrVenom1974<p>Cheese and Chive | Commodore Pet | 2024 | Misfit | Ein großartiger Platf... <a href="https://youtu.be/ztzsqq7go2Q?si=Akfnt5LEXR6XLITg" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">youtu.be/ztzsqq7go2Q?si=Akfnt5</span><span class="invisible">LEXR6XLITg</span></a> via @YouTube <span class="h-card" translate="no"><a href="https://mastodon.social/@itchio" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>itchio</span></a></span> @C64Reposts @wearecommodore <a href="https://mastodon.social/tags/CommodorePet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CommodorePet</span></a></p>
root42<p>Back with the 4040: as usual the drive is a dual CPU system. The second CPU is a regular 6502. One processor handles the IEEE488 bus and DOS routines, while the other is dealing with the GCR encoding and talking to the drive mechanisms. <br>On the 1541 this is all reduced to one CPU. <br><a href="https://chaos.social/tags/commodore" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>commodore</span></a> <a href="https://chaos.social/tags/floppydisk" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>floppydisk</span></a> <a href="https://chaos.social/tags/commodorePET" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>commodorePET</span></a> <a href="https://chaos.social/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputing</span></a></p>
root42<p>Soo… I have gotten another CBM dual drive floppy disk. A model 4040, which uses regular 48tpi single sided drive mechanisms. It was sold to me as defective. The owner bought it used 40 years ago. And after a long time in storage that device was not reading disks anymore. Let us start the process of reviving this beauty, ok?<br><a href="https://chaos.social/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputing</span></a> <a href="https://chaos.social/tags/commodore" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>commodore</span></a> <a href="https://chaos.social/tags/commodorePET" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>commodorePET</span></a> <a href="https://chaos.social/tags/floppydisk" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>floppydisk</span></a></p>
root42<p>Save the date: Another Let's Code Livestream this Sunday, 20th July, 20:00 CEST, 18:00 UTC!<br>More amateur 6502 hacking, to optimize the Infocom interpreter for the Commodore PET!<br><a href="https://youtube.com/live/Ywp51hY5GDo" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">youtube.com/live/Ywp51hY5GDo</span><span class="invisible"></span></a><br><a href="https://chaos.social/tags/infocom" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>infocom</span></a> <a href="https://chaos.social/tags/interactivefiction" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>interactivefiction</span></a> <a href="https://chaos.social/tags/commodore" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>commodore</span></a> <a href="https://chaos.social/tags/commodorePET" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>commodorePET</span></a> <a href="https://chaos.social/tags/retrogaming" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrogaming</span></a> <a href="https://chaos.social/tags/letscode" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>letscode</span></a></p>
☮ ♥ ♬ 🧑‍💻<p>Oh shite, I was wrong. </p><p> Chris has a <a href="https://ioc.exchange/tags/CommodorePET" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CommodorePET</span></a> at home and a thumping big hard drive. Wait for it, Chris is writing <a href="https://ioc.exchange/tags/software" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>software</span></a> in Commodore <a href="https://ioc.exchange/tags/BASIC" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>BASIC</span></a>, an “expert system” for ‘House Planning’. Expected time to completion? </p><p>Three months to write the code; Three months to populate the (database) system to make it useful.</p><p>Hack Chris, Hack</p><p><a href="https://ioc.exchange/tags/hacker" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hacker</span></a> / <a href="https://ioc.exchange/tags/applications" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>applications</span></a></p>
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Colin Haynes

Commodore PET 4016 upgraded to 32k. Refurbished with fantastic help from here:

vintage-radio.net/forum/showth

I got help which included the creation of a 6502 zero page RAM tester that didn't exist for PETs - 45 years after the PET was made.

Several chips replaced including most of the RAM and four out of five of the 40 pin chips. And a new label applied as the old one had gone.

Thanks very much to @simon_brooke for letting me have it.

Commodore PET 4016 pre-restoration.
Commodore PET 4016 post restoration.
#commodore#commodorepet#6502coding
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root42

Well, my newly repaired Commodore 8050 broke down. Again. Not even 45 years old and already having issues! Drive number 1 does not spin anymore. The drives spin their motors up when you close the drive latch, as to center the disk. This does not even happen. So something is off. A bit of probing on the connector reveals that pin 8 from the top is the latch.
#retrocomputing #commodore #commodorePET #floppydrive

Closeup of multimeter probes probing a pin header of a green PCB with lots of components.
Continued thread
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root42

Today was another day where I spent some time on debugging my wonky Commodore 8050 floppy drive. I did more cleaning, testing, swapping of mechanisms, and nothing REALLY worked. Apart from the fact that lying on its side the drive 0 would work better, but not perfectly. Doesn't that sound weird? It would suggest a mechanical issue which "fixes" itself by gravity, so to speak. Right?
RIGHT?

WRONG!

An opened Commodore 8050 floppy drive, partially disassembled. Only one drive is installed, and PCBs are visible in the background
#floppydrive#commodore#cbm8050
Continued thread
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root42

Worked up my courage to work on the 8050 again tonight. The video shows a pretty stable, albeit slightly slow drive mech. The center ring should be perfectly stable. It is drifting ever so slightly clockwise. However my potentiometer is already maxed out. This is probably the old motor giving everything. :)
I can lower the resistor feeding into the pot a bit. That should give more current to the motor.
#retrocomputing #commodore #commodorePET #commodore8050 #floppydrive

Public
root42

Neato: my Snake game now also runs on 8K PETs. You can trim down printf so that it doesn't support float or long types, which we don't need. This frees up a lot of code, so the .prg is now 3.1K in size!

codeberg.org/root42/letscode-c

Forgejo: Beyond coding. We Forge.build for 8K PETs · dbaa169b7dletscode-cbm-pet-snake - The Snake game for the Commodore PET (16k and more)
#letscode#commodore#commodorePET
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