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One pair of conductors are missing as there is an [[#Key Slot|indexing slot]] cut out of the circuit board. | One pair of conductors are missing as there is an [[#Key Slot|indexing slot]] cut out of the circuit board. | ||
The pinout is related to that used for the [[ZX81]], although extended. The [[ZX Printer]] is one such interface capable of attaching to both the ZX81 and ZX Spectrum. | The pinout is related to that used for the [[ZX80/81_Edge_Connector|ZX80 and ZX81]], although extended. The [[ZX Printer]] is one such interface capable of attaching to both the ZX81 and ZX Spectrum. | ||
==Notes on Connections== | ==Notes on Connections== |