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ZX Spectrum 128 edge connector: Difference between revisions

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|0v||14||14||!NMI
|0v||14||14||!NMI
|-
|-
|NC||15||15||!HALT
|[[#Removed Video Outputs|NC]]||15||15||!HALT
|-
|-
|NC||16||16||!MREQ
|[[#Removed Video Outputs|NC]]||16||16||!MREQ
|-
|-
|NC||17||17||!IORQ
|[[#Removed Video Outputs|NC]]||17||17||!IORQ
|-
|-
|NC||18||18||!RD
|[[#Removed Video Outputs|NC]]||18||18||!RD
|-
|-
|!BUSRQ||19||19||!WR
|!BUSRQ||19||19||!WR
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* Upper Pin 23 is connected to the oscillating voltage within the internal power supply circuitry. This is nominally 12 volts AC.
* Upper Pin 23 is connected to the oscillating voltage within the internal power supply circuitry. This is nominally 12 volts AC.
* Lower Pins 6, 7, and 14 are connected to the 0 volt rail.
* Lower Pins 6, 7, and 14 are connected to the 0 volt rail.
====Removed Video Outputs====
Unlike the [[ZX Spectrum 16k/48k]] the [[ZX Spectrum+ 128K]] [[The Spectrum ULA|ULA]] generates RGB and Bright video signals rather than intensity and colour difference signals. The !Y, U, and V signals are therefore not available so the pins previously used for them are left unconnected. Additionally the composite video signal has been removed.