Circuit Diagrams: Difference between revisions

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== J13 - Daughter board connector - Issue 2A/2B ==
== J13 - Daughter board connector - Issue 2A/2B ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:DaughterLocation.jpg]]
DaughterLocation.jpg|Daughter board location
|valign=top| [[Image:Circuit_daughter_board.png]]
Circuit_daughter_board.png|Daughter board
|}
</gallery>


<br/>
<br/>
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== J13 - Daughter board connector - Issue 4 ==
== J13 - Daughter board connector - Issue 4 ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:J13-I4-DaughterLocation.png]]
J13-I4-DaughterLocation.png|J13-I4 daughter location
|valign=top width=25%| [[Image:J13-I4-CircuitDaughterBoard.png]]
J13-I4-CircuitDaughterBoard.png|J14-I4 circuit daughterboard
|}
</gallery>


<br/>
<br/>
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== J15 - Next GPIO - Issue 2A/2B ==
== J15 - Next GPIO - Issue 2A/2B ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:NEXT_GPIO_location.jpg]]
NEXT_GPIO_location.jpg|Next GPIO location
|valign=top width=50%| [[Image:NEXT_GPIO.png|461px]]
NEXT_GPIO.png|Next GPIO
|}
</gallery>


<br/>
<br/>
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== J15 - Next GPIO - Issue 4 ==
== J15 - Next GPIO - Issue 4 ==


{| width=100%
<gallery>
|valign=top width=30%| [[Image:J15-I4-GPIOLocation.png]]
J15-I4-GPIOLocation.png|J15-I4 GPIO Location
|valign=top| [[Image:J15-I4-CircuitGPIO.png]]
J15-I4-CircuitGPIO.png|J16-I4 Circuit GPIO
|}
</gallery>


<br/>
<br/>
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== CN5 - Expansion bus (edge connector) ==
== CN5 - Expansion bus (edge connector) ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:Expansion_bus_location.jpg]]
Expansion_bus_location.jpg|Expansion bus location
|valign=top| [[Image:Expansion_bus.png|461px]]
Expansion_bus.png|Expansion bus
|}
</gallery>


<br/>
<br/>
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== J10/J11 - Memory Expansion Ports ==
== J10/J11 - Memory Expansion Ports ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:Mem_Expansion_location.jpg]]
Mem_Expansion_location.jpg|Mem Expansion location
|valign=top| [[Image:Mem_Expansion.png|461px]]
Mem_Expansion.png|Mem Expanstion
|}
</gallery>


<br/>
<br/>
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== J4/J7 J8/J14 - Joystick Ports ==
== J4/J7 J8/J14 - Joystick Ports ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:Joystick_Ports_Location.jpg]]
Joystick_Ports_Location.jpg|Joystick Ports Location
|valign=top| [[Image:Joystick_Ports.png]]
Joystick_Ports.png|Joystick Ports
|}
</gallery>


<br/>
<br/>
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== CN1 - VGA Video Port ==
== CN1 - VGA Video Port ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:Video_Port_Location.jpg]]
Video_Port_Location.jpg|Video Port Location
|valign=top| [[Image:Video_Port.png]]
Video_Port.png|Video Port
|}
</gallery>


Notes:  
Notes:  
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== CN8 - Digital Port ==
== CN8 - Digital Port ==


{| width=100%
<gallery>
|valign=top width=50%|[[Image:Digital Port Location.jpg]]
Digital Port Location.jpg|Digital Port Location
|valign=top| [[Image:Next Digital Port.png]]
Next Digital Port.png|Next Digital Port
|}
</gallery>


<br/>
<br/>
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== CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse) ==
== CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse) ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:SD_Reader_Port_Location.jpg]]
SD_Reader_Port_Location.jpg|SD reader port location
|valign=top| [[Image:SD_Reader_Main.png]]
SD_Reader_Main.png|SD reader main
|}
</gallery>


<br/>
<br/>
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== CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse) ==
== CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse) ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:SD_Reader_Daughter_Port_Location.jpg]]
SD_Reader_Daughter_Port_Location.jpg|SD reader daughter port location
|valign=top| [[Image:SD_Reader.png]]
SD_Reader.png|SD reader
|}
</gallery>


<br/>
<br/>
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== Accelerator Board ==
== Accelerator Board ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:Accelerator_Port_Location.jpg]]
Accelerator_Port_Location.jpg|Accelerator port location
|valign=top| [[Image:Accelerator_Port.png]]
Accelerator_Port.png|Accelerator port
|}
</gallery>


<br/>
<br/>
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== Real Time Clock (RTC) ==
== Real Time Clock (RTC) ==


{| width=100%
<gallery>
|valign=top width=50%| [[Image:RTC_Port_Location.jpg]]
RTC_Port_Location.jpg|RTC port location
|valign=top| [[Image:RTC_Port.png]]
RTC_Port.png|RTC port
|}
</gallery>


<br/>
<br/>


== CN9 - ESP8266-01/RS-232 Port ==
== CN9 - ESP8266-01/RS-232 Port ==
{| width=100%
<gallery>
|valign=top width=50%| [[Image:Wifi_Port_Location.jpg]]
Wifi_Port_Location.jpg|Wifi port location
|valign=top| [[Image:Next_ESP_Port.png]]
Next_ESP_Port.png|Next ESP port
|}
</gallery>


<br/>
<br/>

Latest revision as of 14:57, 7 October 2025

Schematics

The KS1 and KS2 schematics can be downloaded here.

The three tail matrix keyboard schematic can be downloaded here.

J13 - Daughter board connector - Issue 2A/2B

  • Daughter board location
    Daughter board location
  • Daughter board
    Daughter board


J13 - Daughter board connector - Issue 4

  • J13-I4 daughter location
    J13-I4 daughter location
  • J14-I4 circuit daughterboard
    J14-I4 circuit daughterboard


J15 - Next GPIO - Issue 2A/2B

  • Next GPIO location
    Next GPIO location
  • Next GPIO
    Next GPIO


J15 - Next GPIO - Issue 4

  • J15-I4 GPIO Location
    J15-I4 GPIO Location
  • J16-I4 Circuit GPIO
    J16-I4 Circuit GPIO


CN5 - Expansion bus (edge connector)

  • Expansion bus location
    Expansion bus location
  • Expansion bus
    Expansion bus


J10/J11 - Memory Expansion Ports

  • Mem Expansion location
    Mem Expansion location
  • Mem Expanstion
    Mem Expanstion


J4/J7 J8/J14 - Joystick Ports

  • Joystick Ports Location
    Joystick Ports Location
  • Joystick Ports
    Joystick Ports


CN1 - VGA Video Port

  • Video Port Location
    Video Port Location
  • Video Port
    Video Port

Notes:

  • In VGA mode (scandoubler enabled), H-SYNC and V-SYNC are carried separately on their respective pins.
  • In RGB mode (scandoubler disabled), H-SYNC carries composite sync, and V-SYNC carries 1.
  • Pin 14 carries 3V3, which can be connected to SCART pin 16 to indicate RGB to the display.
  • There is no convenient source of voltages between 9.5-12V to indicate 4:3 aspect ratio to the display on SCART pin 8, so this is usually left unconnected.


CN8 - Digital Port

  • Digital Port Location
    Digital Port Location
  • Next Digital Port
    Next Digital Port


CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse)

  • SD reader port location
    SD reader port location
  • SD reader main
    SD reader main


CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse)

  • SD reader daughter port location
    SD reader daughter port location
  • SD reader
    SD reader


Accelerator Board

  • Accelerator port location
    Accelerator port location
  • Accelerator port
    Accelerator port


Real Time Clock (RTC)

  • RTC port location
    RTC port location
  • RTC port
    RTC port


CN9 - ESP8266-01/RS-232 Port

  • Wifi port location
    Wifi port location
  • Next ESP port
    Next ESP port


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