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boards:ecb:scg:start [2019/05/14 09:40] b1ackmai1er [Errata] |
boards:ecb:scg:start [2019/05/14 09:52] b1ackmai1er [Board Configuration] |
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==== Board Construction ==== | ==== Board Construction ==== | ||
- | * Earlier runs of this board required a patch for sound to work. This patch is documented in the [[https:// | ||
* Install **either** | * Install **either** | ||
* Crystal X2 **must** | * Crystal X2 **must** | ||
* The TMS9918 video controller is sensitive to CPU clock speeds. In general, I have found all software posted here to function well at 4MHz. Higher CPU speeds may or may not work. It is normal for the TMS9918 chip to run quite hot. | * The TMS9918 video controller is sensitive to CPU clock speeds. In general, I have found all software posted here to function well at 4MHz. Higher CPU speeds may or may not work. It is normal for the TMS9918 chip to run quite hot. | ||
* Joystick interface is digital. The up, down, left, right, and button switches should be normally open and shorted to ground to activate. An Atari 2600 joystick can be readily adapted. PC-style game controllers use potentiometers for up/down and left/right and are therefore **not** | * Joystick interface is digital. The up, down, left, right, and button switches should be normally open and shorted to ground to activate. An Atari 2600 joystick can be readily adapted. PC-style game controllers use potentiometers for up/down and left/right and are therefore **not** | ||
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</ | </ | ||
- | You **must** short one (and only one) set of pins above. These pins allow scaling the audio chip oscillator input. The default configuration is no scaling with an osciallator | + | You **must** short one (and only one) set of pins above. These pins allow scaling the audio chip oscillator input. The default configuration is no scaling with an oscillator |
**JP1: TEST2 Enable** | **JP1: TEST2 Enable** | ||
- | Shorting 1-2 will ground the TEST2 pin of the sound controller, otherwise the pin will be disconnected. | + | Shorting 1-2 will ground the TEST2 pin of the sound controller, otherwise the pin will be disconnected. |
**J21: Interrupt Enable** | **J21: Interrupt Enable** |