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ZX Spectrum 128 edge connector: Difference between revisions
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ZX Spectrum 128 edge connector (view source)
Revision as of 17:11, 6 November 2012
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The [[ZX Spectrum+ 128K]] [[:category:Edge Connectors|expansion connector]] is a double sided card edge connector with a 0.1 inch spacing. The two rows of conductors are numbered from right to left looking into the rear of the computer. | The [[ZX Spectrum+ 128K]] [[:category:Edge Connectors|expansion connector]] is a double sided card edge connector with a 0.1 inch spacing. The two rows of conductors are numbered from right to left looking into the rear of the computer. | ||
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 ZX Spectrum +2== | |||
The [[ZX Spectrum +2]] uses the same pinout as the [[ZX Spectrum+ 128K Edge Connector|Spectrum+ 128K]] with the exception of Lower pin 13 which is connected to the [[#!IORQULA|!IORQGE]] input. | |||
==Notes on Connections== | ==Notes on Connections== | ||
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The !CK signal, sometimes referred to as PHICPU is available on Lower Pin 8. This clock signal is generated by the [[The Spectrum ULA|ULA]] and is interrupted during [[contended memory]] access. This clock signal is inverted by a transistor switch to provide a clean clock edge for the Z80. | The !CK signal, sometimes referred to as PHICPU is available on Lower Pin 8. This clock signal is generated by the [[The Spectrum ULA|ULA]] and is interrupted during [[contended memory]] access. This clock signal is inverted by a transistor switch to provide a clean clock edge for the Z80. | ||
This signal is '''NOT''' connected on the Investronica Spectrum+ 128K. | This signal is '''NOT''' connected on the [[Investronica]] [[ZX Spectrum+ 128K]]. | ||
====Missing !IORQULA==== | ====Missing !IORQULA==== | ||
Some schematics label Lower Pin 13 as !IORQULA, however this pin is '''NOT''' connected on either the Investronica or Sinclair Spectrum+ 128K. | Some schematics label Lower Pin 13 as !IORQULA or !IORQGA, however this pin is '''NOT''' connected on either the [[Investronica]] or Sinclair [[ZX Spectrum+ 128K]]. It is connected on the [[ZX Spectrum +2]]. | ||
====Key Slot==== | ====Key Slot==== | ||
