Circuit Diagrams: Difference between revisions

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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

J13 - Daughter board connector - Issue 4

J13-I4 daughter location
J14-I4 circuit daughterboard

J15 - Next GPIO - Issue 2A/2B

Next GPIO location
Next GPIO

J15 - Next GPIO - Issue 4

J15-I4 GPIO Location
J16-I4 Circuit GPIO

CN5 - Expansion bus (edge connector)

Expansion bus location
Expansion bus

J10/J11 - Memory Expansion Ports

Mem Expansion location
Mem Expanstion

J4/J7 J8/J14 - Joystick Ports

Joystick Ports Location
Joystick Ports

CN1 - VGA Video Port

Video Port Location
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
Next Digital Port

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

SD reader port location
SD reader main

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

SD reader daughter port location
SD reader

Accelerator Board

Accelerator port location
Accelerator port

Real Time Clock (RTC)

RTC port location
RTC port

CN9 - ESP8266-01/RS-232 Port

Wifi port location
Next ESP port

@@ Line 1: / Line 1: @@
+== Schematics ==
-== J13 - Daughter board connector ==
+The KS1 and KS2 schematics can be downloaded [https://gitlab.com/thesmog358/tbblue/-/tree/master/docs/schematics?inline=false here].
-{| width=100%
+The three tail matrix keyboard schematic can be downloaded [https://github.com/Threetwosevensixseven/NXtel/wiki/images/NS58A-5-01-04.pdf here].
-|valign=top width=50%| [[Image:DaughterLocation.jpg]]
-|valign=top| [[Image:Circuit_daughter_board.png]]
+== J13 - Daughter board connector - Issue 2A/2B ==
-|}
+<gallery>
+DaughterLocation.jpg|Daughter board location
+Circuit_daughter_board.png|Daughter board
+</gallery>
+<br/>
+== J13 - Daughter board connector - Issue 4 ==
+<gallery>
+J13-I4-DaughterLocation.png|J13-I4 daughter location
+J13-I4-CircuitDaughterBoard.png|J14-I4 circuit daughterboard
+</gallery>
 <br/>
-== J15 - Next GPIO ==
+== 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/>
+== J15 - Next GPIO - Issue 4 ==
+<gallery>
+J15-I4-GPIOLocation.png|J15-I4 GPIO Location
+J15-I4-CircuitGPIO.png|J16-I4 Circuit GPIO
+</gallery>
 <br/>
@@ Line 20: / Line 43: @@
 == 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/>
@@ Line 29: / Line 52: @@
 == 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/>
@@ Line 38: / Line 61: @@
 == 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/>
+== CN1 - VGA Video Port ==
+<gallery>
+Video_Port_Location.jpg|Video Port Location
+Video_Port.png|Video Port
+</gallery>
+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.
+<br/>
+== CN8 - Digital Port ==
+<gallery>
+Digital Port Location.jpg|Digital Port Location
+Next Digital Port.png|Next Digital Port
+</gallery>
+<br/>
+== CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse) ==
+<gallery>
+SD_Reader_Port_Location.jpg|SD reader port location
+SD_Reader_Main.png|SD reader main
+</gallery>
 <br/>
-== CN1 - Video ==
+== CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse) ==
-{| width=100%
+<gallery>
-|valign=top width=50%| [[Image:Video_Port_Location.jpg]]
+SD_Reader_Daughter_Port_Location.jpg|SD reader daughter port location
-|valign=top| [[Image:Video_Port.png]]
+SD_Reader.png|SD reader
-|}
+</gallery>
 <br/>
-== CN8 - HDMI Port
+== Accelerator Board ==
+<gallery>
+Accelerator_Port_Location.jpg|Accelerator port location
+Accelerator_Port.png|Accelerator port
+</gallery>
+<br/>
+== Real Time Clock (RTC) ==
+<gallery>
+RTC_Port_Location.jpg|RTC port location
+RTC_Port.png|RTC port
+</gallery>
+<br/>
-{| width=100%
+== CN9 - ESP8266-01/RS-232 Port ==
-|valign=top width=50%| [[Image:HDMI_Port_Location.jpg]]
+<gallery>
-|valign=top| [[Image:HDMI_Port.png]]
+Wifi_Port_Location.jpg|Wifi port location
-|}
+Next_ESP_Port.png|Next ESP port
+</gallery>
 <br/>