Difference between revisions of "Circuit Diagrams"

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== Schematic ==
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The Issue 2B (rev 1) schematic can be downloaded [https://gitlab.com/thesmog358/tbblue/-/raw/master/docs/schematics/specnext-schematics.pdf?inline=false here].
  
 
== J13 - Daughter board connector ==
 
== J13 - Daughter board connector ==
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|valign=top| [[Image:Video_Port.png]]
 
|valign=top| [[Image:Video_Port.png]]
 
|}
 
|}
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Notes:
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* In VGA mode (scandoubler enabled), H-SYNC and V-SYNC are carried separately on their respective pins.
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* In RGB mode (scandoubler disabled), H-SYNC carries composite sync, and V-SYNC carries 1.
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* Pin 14 carries 3V3, which can be connected to SCART pin 16 to indicate RGB to the display.
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* 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/>
 
<br/>
  
== CN8 - HDMI Port ==
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== CN8 - Digital Port ==
  
 
{| width=100%
 
{| width=100%
|valign=top width=50%| [[Image:HDMI_Port_Location.jpg]]
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|valign=top width=50%|[[Image:Digital Port Location.jpg]]
|valign=top| [[Image:HDMI_Port.png]]
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|valign=top| [[Image:Next Digital Port.png]]
 
|}
 
|}
  
 
<br/>
 
<br/>
  
== CN2/CN6/CN7 - SD Reader (Mainboard) ==
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== CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse) ==
  
 
{| width=100%
 
{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Port_Main_Location.jpg]]
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|valign=top width=50%| [[Image:SD_Reader_Port_Location.jpg]]
 
|valign=top| [[Image:SD_Reader_Main.png]]
 
|valign=top| [[Image:SD_Reader_Main.png]]
 
|}
 
|}
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<br/>
 
<br/>
  
== CN10/CN11/CN12 - SD Reader (Daughterboard) ==
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== CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse) ==
  
 
{| width=100%
 
{| width=100%
|valign=top width=50%| [[Image:SD_Reader_Port_Location.jpg]]
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|valign=top width=50%| [[Image:SD_Reader_Daughter_Port_Location.jpg]]
 
|valign=top| [[Image:SD_Reader.png]]
 
|valign=top| [[Image:SD_Reader.png]]
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|}
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<br/>
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== Accelerator Board ==
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{| width=100%
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|valign=top width=50%| [[Image:Accelerator_Port_Location.jpg]]
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|valign=top| [[Image:Accelerator_Port.png]]
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|}
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<br/>
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== Real Time Clock (RTC) ==
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{| width=100%
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|valign=top width=50%| [[Image:RTC_Port_Location.jpg]]
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|valign=top| [[Image:RTC_Port.png]]
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|}
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<br/>
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== CN9 - ESP8266-01/RS-232 Port ==
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{| width=100%
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|valign=top width=50%| [[Image:Video_Port_Location.jpg]]
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|valign=top| [[Image:Next_ESP_Port.png]]
 
|}
 
|}
  
 
<br/>
 
<br/>

Latest revision as of 20:45, 3 May 2020

Schematic

The Issue 2B (rev 1) schematic can be downloaded here.

J13 - Daughter board connector

DaughterLocation.jpg Circuit daughter board.png


J15 - Next GPIO

NEXT GPIO location.jpg NEXT GPIO.png


CN5 - Expansion bus (edge connector)

Expansion bus location.jpg Expansion bus.png


J10/J11 - Memory Expansion Ports

Mem Expansion location.jpg Mem Expansion.png


J4/J7 J8/J14 - Joystick Ports

Joystick Ports Location.jpg Joystick Ports.png


CN1 - VGA Video Port

Video Port Location.jpg Video Port.png

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.jpg Next Digital Port.png


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

SD Reader Port Location.jpg SD Reader Main.png


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

SD Reader Daughter Port Location.jpg SD Reader.png


Accelerator Board

Accelerator Port Location.jpg Accelerator Port.png


Real Time Clock (RTC)

RTC Port Location.jpg RTC Port.png


CN9 - ESP8266-01/RS-232 Port

Video Port Location.jpg Next ESP Port.png