Commodore 1571 / 128D Frankenstein
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- Опубліковано 2 лип 2024
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🛍️ Tindie store: www.tindie.com/stores/theretr...
🛠 Tools and kit: / tools-and-kit-77570017
💬 Discord: / discord
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1571 schematics: www.zimmers.net/anonftp/pub/c...
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0:00 Intro
2:41 Fitment
5:25 Power
8:25 Drive LED
11:07 Serial IEC
16:38 Tests
19:50 Logic (non)issue
24:11 Summary of changes
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Thanks for watching! - Наука та технологія
This is just my type of shenanigans. Always good to know what could get an old C=128 up and running again.
2:08 You only need the Serial Shift Register, Interupt, and TimerA in your 1571 CIA. You can sub in an Amiga 8520 CIA, or any 6526A chips you might have even if they have faulty IO ports.
A few years ago I fully reversed the 1581 board and made an identical 1:1 reproduction. If the guy with the rotten 1571 board sends it to me I'll reverse it and make the PCB files and gerbers open-source.
He tried to leave a comment but it was automatically removed by UA-cam 😒
You can find him in my discord server (link is in the description)
@@TheRetroChannel Yeah he got hold of me. I don't do discord, waste of time ;-)
@@TheRetroChannel Had a chat. You won't believe it, he lives only about 1km from me in the same suburb a couple of streets away lol!
Huh, I always thought the boards were the same in a 1571 an a C128. Never did check though. Fwiw, I would just have run an IEC cable between the connectors for a test like this. :)
Oh wow, I wouldn't have thought of shoving the header in the connector that way! Thanks !
Great research. You are right, reverse engineering old Commodore PCBs isn't easy. I went through this with a PCB design guru a few years ago to make a replica SX-64 I/O PCB. If you don't have access to someone with the requisite skills it's a monumental task.
Very cool. I suspect that the 6th pin is the shield on the din connector which has little effect if you are not using a shielded cable.
Great repairing!
Excellent video. Another one saved! U are very smart/intelligent. Great work and troubleshooting. 5 stars
Made me sad for culling my C128D years ago. 😢
Good video. I've wondered for decades how much that built in drive differs from the 1571. The answer: Not much.
Great job, makes me wonder that no one tried this before...
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17:07 Autoboot only works on a disk that has a special file to make it autoboot. There's a section in the 1571 and 1581 manual about it. Basically the file is 'COPYRIGHT CBM 86.USR' and that file is autobooted if found.
Hi, what the C128 does for booting is drive independent, it also works with a 1541, it just loads sector 1,0 and if the pattern matches the first few bytes it takes it as a Boot-sector, that's also how it boots CP/M,
the 1581 on the other hand has more options to boot, it also can boot software into the drives Ram and execute it there, that's where the filename comes into play, and that's computer independent
About that LED connector: you could eject the crimp terminals from the crimp housing and rearrange them in the required way. Using ready made Dupont cables is a good thing. You could get some crimp housings and just swap the single pin housings for a fitting (here 7 pin) crimp housing. That might be mechanically more stable. Or you secure the connector with a drop of silicon glue (which can be cut open easily, if required).
Ah yeah true, probably a good idea if it was installing it permanently.
lol'd at the unmatched probe connectors!
Sounds like a ROM in the C128D is different.
The ROMs used for the 128D drive and the 1571 are identical.
Very entertaining. What would we do without Dupont connectors?
15:42 "gut" 😂 I like You speaking German!
Danke!
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Hello, a great experiment with the c128. I think it's very interesting. A question: "Does anyone know about the original C65 (!) and a way to deactivate the internal drive? So that I could operate an IEC2SD module? And can you operate a C64 module on a C65 with a C16 adapter? I would be for All suggestions are very grateful. Kind regards, all the best and thanks for the clip. Greetings to all retro technology fans. PS: sorry for my lousy english..😞 your RoboTronic64 from Chemnitz...
if you own a real and working c65 you are one of about maybe 3 people. Meaning no one knows anything or has any experience with it except those 3 people and highly likely 2 of them are not watching this vid or reading your comment ;-)
One way could be to change the device number on the internal drive using the usual solder blob jumpers (or software commands) to device 9 and then use the sd2iec as device 8. Another way is use the sd2iec as device 9.
Great work man! I have a 128D without ready cursor in 128 mode: looking this video I now suppose is due to a non working floppy, not a broken cia as I imagined 😞
I'd still suspect the CIA. Does the keyboard work at all, or does it show a cursor in 64 mode?
You could always disconnect the IEC cable going to the floppy controller board to disable it (assuming it is not the DCR version)
@@TheRetroChannel if I remember well the keyboard worked in 64 mode ...but I didn't try any floppy with it because I would like to clean the drive before, so now I will try to disconnect the floppy, mine is not a DCR..thank you for now
Sorry, but unless you document all of the changes, down the road, the owner then. will have an UN-repairable KLUDGE. Which will not be cost effective to take the time to repair. Reverse engineering is one thing but jury-rigging is something very different.