Circuit Diagrams: Difference between revisions
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* In VGA mode (scandoubler enabled), H-SYNC and V-SYNC are carried separately on their respective pins. | * 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. | * 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 signal RGB. | |||
* There is no convenience source of voltages between 9.5-12V to signify 4:3 aspect ratio on SCART pin 8, so this is usually left unconnected. | |||
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Revision as of 20:26, 3 May 2020
Schematic
The Issue 2B (rev 1) schematic can be downloaded here.
J13 - Daughter board connector
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J15 - Next GPIO
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CN5 - Expansion bus (edge connector)
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J10/J11 - Memory Expansion Ports
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J4/J7 J8/J14 - Joystick Ports
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CN1 - VGA Video Port
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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 signal RGB.
- There is no convenience source of voltages between 9.5-12V to signify 4:3 aspect ratio on SCART pin 8, so this is usually left unconnected.
CN8 - Digital Port
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CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse)
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CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse)
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Accelerator Board
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Real Time Clock (RTC)
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CN9 - ESP8266-01/RS-232 Port
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