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Marty: “What, what is it hot?” Doc: “It's cold, damn cold.”

A project log for Rämixx500 - Amiga 500+ Mainboard

Open Hardware Remake of this Commodore Masterpiece

Edoardo AUTERIEdoardo AUTERI 07/05/2021 at 10:240 Comments

The printed circuit board of Ramixx500 offers an improved dissipation. Overall it is about -3°C colder than the original Commodore Rev. 8A.1.

Particularly, we observed improvements across the following surfaces:

A good strategy was to use a solid ground plane under the main heat source, minimizing the thermal resistance and maximizing the heat dissipation. Consequently, we have avoided fragmented ground planes on both layers and eventually we have considered narrowed power tracks.

Thermal cycle:

OFF > Cooldown 120 minutes > ON > Warm-up (kickstart screen) 30 minutes > Load condition (ECS game) 55 minutes > Screen capturing 5 minutes > OFF

The whole PCB

Left: Ramixx500 V2, Right: Original A500 Rev 8A.1

CPU and FAT Agnus

Left: Ramixx500 V2, Right: Original A500 Rev 8A.1

Denise and HY

Left: Ramixx500 V2, Right: Original A500 Rev 8A.1

Paula, CIA and RS232

Left: Ramixx500 V2, Right: Original A500 Rev 8A.1

Gary and Audio section

Left: Ramixx500 V2, Right: Original A500 Rev 8A.1

RAM chips

Left: Ramixx500 V2, Right: Original A500 Rev 8A.1

Condition:

Equipment:

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