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ZX80/81 edge connector: Difference between revisions

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{{overline|RAMCS′}} and {{overline|ROMCS′}} are connected directly to the ROM and RAM chip select inputs. They are connected to the computer's logic via series resistors so that their value can be overridden by an external peripheral which is denoted by the prime symbol.
{{overline|RAMCS′}} and {{overline|ROMCS′}} are connected directly to the ROM and RAM chip select inputs. They are connected to the computer's logic via series resistors so that their value can be overridden by an external peripheral which is denoted by the prime symbol.


{{overline|ROMCS′}} is only present on the ZX81. on the ZX80 this pin is not connected.
The {{overline|ROMCS′}} signal is only present on the ZX81. On the ZX80 this pin is '''NOT''' connected.


====CPU Clock====
====CPU Clock====