Mac Classic with a Pi & USB-C

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woodapples

Active member

• Sep 20, 2022

• #1

Finally, after the troubles i had in this thread, I'm now able to power the early Mac Classic's analog board with USB Type C!
(Right now im using its fixed up logic board that is also powered by USB Type C for demonstration purposes).

Final aim is to make it like what they did here. But with a Raspberry Pi 4.

View attachment IMG4747.mov

 

Nixontheknight

Well-known member

• Sep 21, 2022

• #2

that seems very possible, you'd just have to figure out how to send the video to the display with the right timings

 

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woodapples

Active member

• Sep 21, 2022

• #3

@Nixontheknight yes, i actually have figured out that part already! I just need some parts to arrive today so that i can display from the RPi 4

 

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woodapples

Active member

• Sep 21, 2022

• #4

And we did it



View attachment IMG_4962_2.mp4

 

Last edited: Sep 21, 2022

Nixontheknight

Well-known member

• Sep 21, 2022

• #5

woodapples said:

And we did it

View attachment 46726View attachment 46727

View attachment 46728

Click to expand...

noice, what emulator are you using on the Pi?

 

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woodapples

Active member

• Sep 22, 2022

• #6

I'm using a custom build of minivmac beta, running on SDL2 and renders dirctly on gpu accelerated framebuffer without Xorg

 

AndiS

Well-known member

• Sep 22, 2022

• #7

That is pretty awesome!

 

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woodapples

Active member

• Aug 17, 2023

• #8

After more than a year of service as a Raspberry Pi 4 home server, It's still going strong I've added a adb2usb converter courtesy of https://github.com/tmk/tmk_keyboard/tree/master/converter/adb_usb

The CRT has been continuously running ever since, it's noiseless and only consumes 30W of USB power.

 

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woodapples

Active member

• Aug 23, 2023

• #9

Can't believe I forgot to post it but here's my config.txt for the rpi 4 if anyone wants to replicate:

kernel=rpi4-u-boot.bin dtoverlay=upstream-pi4 arm_boost=1 dtoverlay=vc4-kms-v3d-pi4 dtoverlay=cma,cma-256 max_framebuffers=2 arm_64bit=1 gpu_mem=16 boot_delay=0 force_eeprom_read=0 initial_turbo=15 disable_splash=1 enable_uart=0 enable_dpi_lcd=1 display_default_lcd=1 dtoverlay=vc4-kms-dpi-generic dtparam=hactive=512,hsync-invert dtparam=hfp=12,hsync=178,hbp=2 dtparam=vactive=342,vsync-invert dtparam=vfp=1,vsync=4,vbp=24 dtparam=clock-frequency=15628800,rgb888

 

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woodapples

Active member

• Aug 23, 2023

• #10

Also the analog board voltage hooks schematic buried in the previous thread:

WARNING: If you don't know how to deal with high voltage stuff, please stay away from this thread. I am not liable for any lethal/non-lethal injuries or damages resulting from the use of this information.

 

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Aeroform

Well-known member

• Sep 23, 2023

• #11

Crazy cool! Have you thought about trying out greyscale?

 

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woodapples

Active member

• Nov 12, 2023

• #12

Aeroform said:

Crazy cool! Have you thought about trying out greyscale?

Click to expand...

Hi! Sorry for the reply, Yes I've thought about trying out grayscale but I haven't got the time to replicate the grayscale neck board yet. Soon maybe?

 

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woodapples

Active member

• Apr 1, 2024

• #13

I've modified `dtparam=vactive=342,vsync-invert` from 342 to 384 to have a proper 4:3 aspect ratio. After adjusting the vertical size potentiometer it seems to work well!

 

Last edited: Apr 1, 2024