C128 vs C128d motherboard - World of Jani

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C128 vs C128d motherboard

The first version of c128d had the same motherboard as the c128. The later c128dcr (cost reduced) had a different motherboard.

Pictures of c128 and c128d (not dcr) for comparsion.

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Dominic Berlemann

October 5th, 2015 at 8:55 PM

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Nice piece of work!
Some1

December 26th, 2018 at 12:12 PM

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I know I’m commenting very late but in case anyone else stumbles across this post: The C128 and the D version were designed at the same time, but production of the 128D was delayed. The C64C-style 128 has the hole in the motherboard because the motherboard also had to fit the 128D, which needs it for a support pillar.

Jani

December 29th, 2018 at 3:03 PM

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Thanks, addidtional information is always welcome 🙂

Aleksandar Mraovic

January 27th, 2019 at 2:24 AM

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I just got a 128 flat, and I also have an additional wire on the board like the “D” here from J7 to one side of that cap. Do you think that is factory? Because someone also installed a custom character rom like on the picture of that “D” board.

Jani

January 28th, 2019 at 1:52 PM

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Hi Alexandar,
The modification is factory and used for switching to (inter)national characterset. The J7 is configured to connect together CAPSLOCK-key and pin 21 on the CHARROM(U18). This allows you to switch banks in the CHARROM using the CAPSLOCK-key, resulting in two individual charactersets. The CAPSLOCK key has different printing in different regions. “CAPS LOCK”(US), “ASCII/DIN”(DE), “CAPS LOCK ASCII/CC”(SE/FI). Possibly other combinations exist.
Regards
Jani

Aleksandar Mraović

January 28th, 2019 at 4:33 PM

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That looks to be exactly it!
The rom is marked with de localization and I also have key marked ASCII/DIN.

Impressed by your knowledge. Cheers!

Jani

January 28th, 2019 at 6:00 PM

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Thanks 🙂

Jeroen

June 4th, 2020 at 9:07 AM

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there’s another C128 mainboard out there…
it’s board 250783, it’s the cost reduced version mainboard for the wedge shaped version of the C128, called C128CR.
Ethan

September 4th, 2020 at 8:47 PM

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What’s the ribbon cable up by the tape drive port?

Jani

September 4th, 2020 at 9:36 PM

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Hi Ethan,
The ribbon cable connects to the 1571 drive PCB (schematics call it the “internal serial bus connector”). The 128DCR (metal case) has everything integrated into one large PCB.
//Jani

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