POKROM
From CPCWiki - THE Amstrad CPC encyclopedia!
POKROM is a ROM board using either static ram (2K or 8K) with battery backup, or 2K or 8K EPROM.
The plans were printed in the French magazine 'Electronique Radio Plans' issue 517.
Sorry for poor scans, they were taken from a photocopy of the original. I will upload translated text and better diagrams.