Commodore PET 2001 Repair

[@jaycee1980]

It's always good to broaden your horizons.. the museum in Cambridge has been excellent for me in this regard !

[@HappyLittleDiodes]

I've never been!

[@jaycee1980]

As soon as I saw 2114's i thought "Ugh... SRAM replacement time". Those things are pains in the arse and can be difficult to get hold of. The ROMs being dead didnt surprise me either. You CAN read them in a Minipro with a small adapter arrangement.. likewise you can replace them with standard 27C64's (i think) but they need a bit of adaptation. I think the Tynemouth thing you bought is a great overall solution

[@jasejj]

They had one of these (this exact model) at school, alongside a room full of 16K Spectrums. So I'm happy for it to be on the channel. I found it interesting. I quickly realised how similar it is to the VIC20, it's BASIC compatible and tape recordings from one will work (to a degree) on the other (also the case for the C64). This made homework interesting. The keyboard was obstructive even in 1984...

[@apx5777]

Gravel?! wow that's the first time I've seen that inside a computer

[@HappyLittleDiodes]

Yeah pretty rough!

[@williamsteele]

Now that you have it working and validated, it's time to do a second video where you restore the ram and roms. It's much better with the original bits in it, in my opinion. This one is just a little newer than mine... they're almost identical except that mine has the white ceramic ROMs in it and has the metal faceplate instead of the sticker version. (Mine is a very early one, serial #465.) Also, my heat sinks on the power supplies are different. Nice job getting her back up and running!

[@HappyLittleDiodes]

I can restore the RAM but to do the ROMs I'd have to at least buy 7 more adapters, or find original working chips, which sounds difficult!

[@terryraymond7984]

kind of neat to see how the vic20 and C64 keyboard came from neat

[@stevesmusic1862]

What a great video!! Good to see another vintage pc get a second life :)

[@zxrenew5642]

Excellent, got one here as well. I used a different rom/ram board though.

[@Xoferif]

I rather like the little ortholinear keyboard! It has an interesting layout, and I could imagine with a bit of practice you could whizz along typing on it. =)

[@paulsmith5300]

WYLD STALLYNS!!

[@XYZ56771]

How did you test ram chips? Can you share the Arduino setup? Thank you! Great content!

[@HappyLittleDiodes]

This explains it! You would need to adapt it a little depending on the chip kzbin.info/www/bejne/jJOTaomLZa2Zo6s

[@InkRebellion]

Great content 👏

[@chuckhutchins6107]

@15:32 it looks to me like that belt is way too small. Seems that you had to stretch it far too much. Ideally you only want to stretch it about 5%. Too much tension will quickly damage the motor bearings and other pulleys. The piano keys drive mechanics are the same as the C2N but I've ordered belts from suppliers before that have been too small. The correct size should be ~9.8 to 10" (~249-254mm) circumference with a ~0.48 (1.2mm) square cross section.

[@jelenakostic5123]

Can Commodore "2001" series accept linux?

[@markretro3612]

great video, very informative as normal .. that keyboard pcb looks a bit like a mini Amstrad cpc 464 (only the original model)

[@HappyLittleDiodes]

I've not had one of them in yet!

[@markretro3612]

just working on my specie pcb keyboard ..i thought it would be good for diagnostic work to be able to plug into the edge connector rather than plugging unplugging the membranes in..

[@HappyLittleDiodes]

That's a good idea, I found it hard to do though due to the lack of KBD pins on the edge connector, I did it in the "quartet" video but I had an arduino doing the typing

[@markretro3612]

@@HappyLittleDiodes ohh i haven't seen that one, will have a look now as Arduino is the other thing I'm looking at using a pc keyboard .

[@HappyLittleDiodes]

Unfortunately there's not much explanation, maybe I should do a part 2!

[@DAVIDGREGORYKERR]

if only the cassette out would output a SPDIF signal compatible with any DAT machine and if only the cassette in would accept a SPDIF signal that would be decoded back into bytes you could load and save programs very quickly and if you could somehow save the title to the file you could find programs a lot easier and loading a snap.

[@jasejj]

I think the same speedload systems from the C64 would work on this, in principle.

[@jaycee1980]

you're a few decades too early for that ;) but you can get an audio signal out of it. It's similar to how the Commodore 64's datasette works.

[@Xalior]

Instant Unsubscribe. -Dx