V1.1 Updates to improve picture quality and eliminate the need for excessive overclocking

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Roger Lueder 2021-06-12 06:38:42 -07:00
rodzic e5bd570370
commit bcb667f1c2
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This adapter builds on the ideas from the Amiga Denise adapter V2, adapted for use in big box Amiga video slots.
The main differences are:
- The 7MHZ signal is derived via C1 XNOR C3 using an additional 74LVC86 since 7MHZ is not available directly from the video slot
- The 7MHZ signal is derived via C1 XNOR C3 since 7MHZ is not available directly from the video slot
- Two button connectors allow for both a rear slot cover bracket button and another to be used, mounted wherever desired
The card edge connector used is from Amiga-KiCad-Library (https://github.com/JustinBaldock/Amiga-KiCad-Library). Approximately 1mm of space is left between the fingers and the PCB edge to allow for beveling.
## Recommendations for builders & resellers
- To ensure the best possible picture on all Amigas, builders should include C6 (47 pf capacitor).
- V1.0 boards can easily be updated to include C6 by soldering the capacitor between pins 9 and 11 of the Pi connector on the bottom side of the board
- Try the default software profile first, and if any glitches appear on the image update the software profile settings to include the below settings:
- Settings Menu->Overclock CPU: 40
- Settings Menu->Overclock Core: 170
- Sampling Menu->Sync Edge: Trailing with +ve PixClk
- A heat sink on the Pi is also highly recommended.
## Assembly
- [Interactive BOM](bom/ibom.html)
@ -25,5 +16,9 @@ The card edge connector used is from Amiga-KiCad-Library (https://github.com/Jus
- Orient the PCB such that the end with bracket mounting holes faces the rear of the machine
## Version History
- V1.1:
- Routing changes that eliminate "sparkling" on certain image patterns
- Excessive overclocking and the extra 47pf capacitor should no longer be necessary
- Make use of unused gates on the original 74LVC86 instead of adding another
- V1.01 Added spot for 47pf capacitor (C6) to ensure no sparkling on image, and grounded unused inputs on U5 per data sheet recommendation.
- V1.00 Initial version.

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update=4/3/2021 11:05:14 AM
update=6/8/2021 8:01:24 PM
version=1
last_client=kicad
[general]

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Sheet 1 1
Title "RGBtoHDMI Amiga Video Slot Adapter"
Date "2021-04-03"
Rev "1.01"
Date "2021-06-03"
Rev "1.1"
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