Apple 512kb 68Pin VRAM (PN 820-0605-A)

An open source VRAM module based on the Apple 820-0605-A (Open Hardware). The PCB is 1.2mm thick, larger sizes may not work.

License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Schematics

The schematics are available to download in Hi-Res JPEG (300 DPI), Lo-Res JPG (72 DPI), and PDF Vector format.

Bill of Materials

• 1x 820-0605-A PCB
• 4x M5M442256AJ-10 VRAM Modules
• 5x 0805 SMD 100nF Ceramic Capacitor (Digi-Key)

Compatibility

The following images illustrate compatibility and color support.

1. Color range support requirements.
2. Requirements per supported machine.

Credits

Special thanks is owed to the following:

1. GeekyBit from Geeky Bit for loaning me a 512kb VRAM module for backward engineering.
2. The Open Retro SCSI Discord Server for fostering community development on retro hardware.