@root42@chaos.social
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root42

@root42@chaos.social

https://www.youtube.com/root42
Coding, tinkering, ancient hardware and software.
he/him
#retrogaming #letscode #demoscene
If you want to support me, you can do so at the links below. I also have Ko-Fi, but there aren’t enough entries…

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root42, to retrocomputing
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Chiperia!

Musicdisk Chiperia 11

root42, (edited ) to retrocomputing
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New video for Patrons: Commodore PET: 40K RAM with SoftROM
https://www.patreon.com/posts/commodore-pet-105886064?utm_medium=clipboard_copy&utm_source=copyLink&utm_campaign=postshare_creator&utm_content=join_link

root42, to c64
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Question to my #commodore #c64 bubble: How do I change the file type of an existing file (e.g. from PRG to SEQ)?

root42, to random
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Happiest girl I ever knew
Wanted to be your joy
Flow between your lips

phranck, to random
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Ach guck, beim Aufräumen in der Werkstatt gefunden. 😃

root42,
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@phranck ich hab irgendwo noch Alu Pfennige, die mir mein Cousin aus der Zone geschickt hat…

root42, (edited ) to random
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The CBM 8050 saga continues. I have reassembled the drive and wanted to test it. It seems the following issues are at hand:
At least drive 0 has a speed issue, needs calibration. All format commands return a speed error. I might need to apply the resistor fix I did on my other drive, lowering the resistance and increasing RPM.
Drive 1 seems to have an issue with the optical sensor for write protection. Either the sensor or the infrared LED doesn't work. I might have plugged in the cables wrong.

root42,
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Onwards with the #commodore #cbm8050
I managed to calibrate the drive 0 to 300RPM. This is good! No need to do the resistor bodge as in my other drive!

Strobodisk on the bottom of the drive, showing a steady 60Hz ring when the drive is spinning.

root42,
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But now drive 0 also show write protect! Damnit!
Reading still works...

root42,
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It turns out that this 7404 on the drive 1 deals with the write protect signal, also for drive 0! I didn’t have this connected for this calibration!

root42,
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Furthermore the solder joints on the pin header were all cracked. I added fresh solder and reflowed them. This should help with the write protect of drive 1 as well!

root42,
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But sadly drive 0 still doesn’t format disks. It doesn’t give a speed error anymore, but a read error! Maybe something wrong with the write circuit…? Sometimes it gets to 40-50%…

root42,
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The exact error that I am getting is 23. interesting enough reading from a floppy written in my other 8050 works fine. So my guess is that this is indeed an issue with writing on this particular drive.

root42,
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Writing works absolutely fine on drive 0. Well, the status LED blinks red once in a while, so maybe there are intermittent errors, but at least it works! I could copy many hundreds of blocks onto an already formatted disk. But formatting still doesn't work. Now we have to debug. What can we test to see what's happening on the analog board?

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