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== Signals used for Ram management ==
The following signals are used for ram management and are available on the expansion connector.
=== RAMDIS ===
(Internal RAM Disable; Input to Internal RAM)
When RAMDIS="1" the internal RAM of the CPC/CPC+/KC Compact is forced inactive.
e.g. a ram-expansion device would use this signal to override the internal RAM selection with the ram on the device. The internal RAM would be forced inactive, and the ram on the ram-expansion would be actived.
=== /RAMRD ===
(Ram Read; Output from Gate-Array)
When /RAMRD="0" a ram read operation is active. This signal is generated by the Gate-Array. This signal will be "0" when:
* A15=A14="0" and bit 2 of the Gate-Array rom configuration register is set to 1. (lower rom disable)
* A15=A14="1" and bit 3 of the Gate-Array rom configuration register is set to 1. (upper rom disable)
* A15 is not equal to A14.
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