ColecoVision NTSC DRAM to SRAM Converter Upgrade

A board that replaces the ColecoVision's video memory with modern static RAM - one of the most worthwhile things that can be done to a console that is still working, and the fix for one that is not.

The problem

• The console uses eight 4116 DRAM chips, which need three supply rails: +5V, +12V and -5V.
• They run hot and fail, and the console's power switch is unreliable in a way that makes that worse - dirty contacts show up as glitched graphics or no picture at all.

What the board does

• The original DRAM, its decoupling capacitors and the power inductors all come out, and the converter goes where the DRAM was.
• Modern SRAM needs 5V alone, so the +12V and -5V rails stop being needed for memory at all - less heat, fewer parts, and one less thing the ageing supply has to deliver.

The alternative in the community is swapping the 4116s for 4164s, which also gets to a single rail. This board goes further by removing the obsolete parts entirely. A PAL version is sold alongside the NTSC one.