Difference between revisions of "ZX Spectrum 16K/48K edge connector"

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m (Video Outputs)
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|A12||2||2||A13
 
|A12||2||2||A13
 
|-
 
|-
| +5v||3||3||D7
+
|[[#Power|+5v]]||3||3||D7
 
|-
 
|-
| +9v||4||4||NC
+
|[[#Power|+9v]]||4||4||NC
 
|-
 
|-
 
|[[#Key_Slot|SLOT]]||5||5||[[#Key_Slot|SLOT]]
 
|[[#Key_Slot|SLOT]]||5||5||[[#Key_Slot|SLOT]]
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|!BUSRQ||19||19||!WR
 
|!BUSRQ||19||19||!WR
 
|-
 
|-
|!RESET||20||20|| -5v
+
|!RESET||20||20||[[#Power|-5v]]
 
|-
 
|-
 
|A7||21||21||!WAIT
 
|A7||21||21||!WAIT
 
|-
 
|-
|A6||22||22|| +12v
+
|A6||22||22||[[#Power|+12v]]
 
|-
 
|-
|A5||23||23|| -12v
+
|A5||23||23||[[#Power|12v AC]]
 
|-
 
|-
 
|A4||24||24||!M1
 
|A4||24||24||!M1
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====Key Slot====
 
====Key Slot====
 
The key slot ensures correct alignment of a peripheral with the edge connector. The slot occupies the pin 5 positions
 
The key slot ensures correct alignment of a peripheral with the edge connector. The slot occupies the pin 5 positions
 +
 +
====Power====
 +
* Lower Pin 4 is connected to the +9 volt (nominal) DC supply from the ZX Spectrum PSU.
 +
* Lower Pin 3 is connected to the smoothed +5 volt DC output of the internal 7805 regulator.
 +
* Upper Pin 20 is connected to the -5 volt DC output of the internal power supply circuitry.
 +
* Upper Pin 22 is connected to the +12 volt DC output of the internal power supply circuitry.
 +
* 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.
  
 
====Video Outputs====
 
====Video Outputs====
 
Pin 15 on the lower side of the edge connector provides the same composite video signal that is fed into the UHF modulator.
 
Pin 15 on the lower side of the edge connector provides the same composite video signal that is fed into the UHF modulator.
 
Lower pin 16 on the carries an inverted luminosity signal to use with the 'U' and 'V' colour difference signals provided on lower pins 18 and 17 respectively
 
Lower pin 16 on the carries an inverted luminosity signal to use with the 'U' and 'V' colour difference signals provided on lower pins 18 and 17 respectively

Revision as of 21:32, 20 February 2012

Lower Upper
A14 1 1 A15
A12 2 2 A13
+5v 3 3 D7
+9v 4 4 NC
SLOT 5 5 SLOT
0v 6 6 D0
0v 7 7 D1
!CK 8 8 D2
A0 9 9 D6
A1 10 10 D5
A2 11 11 D3
A3 12 12 D4
!IORQULA 13 13 !INT
0v 14 14 !NMI
VIDEO 15 15 !HALT
!Y 16 16 !MREQ
V 17 17 !IORQ
U 18 18 !RD
!BUSRQ 19 19 !WR
!RESET 20 20 -5v
A7 21 21 !WAIT
A6 22 22 +12v
A5 23 23 12v AC
A4 24 24 !M1
!ROMCS 25 25 RFSH
BUSACK 26 26 A8
A9 27 27 A10
A11 28 28 NC

Notes on Connections

Key Slot

The key slot ensures correct alignment of a peripheral with the edge connector. The slot occupies the pin 5 positions

Power

  • Lower Pin 4 is connected to the +9 volt (nominal) DC supply from the ZX Spectrum PSU.
  • Lower Pin 3 is connected to the smoothed +5 volt DC output of the internal 7805 regulator.
  • Upper Pin 20 is connected to the -5 volt DC output of the internal power supply circuitry.
  • Upper Pin 22 is connected to the +12 volt DC output of the internal power supply circuitry.
  • 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.

Video Outputs

Pin 15 on the lower side of the edge connector provides the same composite video signal that is fed into the UHF modulator. Lower pin 16 on the carries an inverted luminosity signal to use with the 'U' and 'V' colour difference signals provided on lower pins 18 and 17 respectively