Support Noel's Retro Lab on Patreon: Sometimes we want to force the Amstrad to use the upper 64KB of RAM as the main RAM. For example when we have a faulty RAM chip in the upper RAM, or when the Amstrad isn't starting up with faulty lower RAM.
Today we build an adaptor to replace the HAL (PAL) chip that forces the Amstrad to use the upper RAM bank as the main RAM. It's actually really simple and only takes a socket with a few bridges on it.
With that in hand, we then test the upper RAM, find a faulty chip, replace it, and test everything again.
RAM test by Gerald:
Gerald's post about forcing bank 2:
Bryce's socket idea:
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