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Item # Component Quantity
1
onsemi - 74HC08DR2G
2
0.1uF ceramic 0603 capacitor
3
100r 0603 resistor
4
47r 0603 resistor
5
330r 0603 resistor
6
1A fuse
7
4 Pin Header
8
Female 15 pin DSUB VGA
9
4x M3x10 screws
10
GBS8200 or GBS8220
11
Si5351A clock generator to upgrade the GBS8200
12
D1 Mini Pro 4M Bytes ESP8266 with Ipex antenna
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Detail Description
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This is an adapter to install a GBS8200 or GBS8220 internally in an Amiga 2000, with VGA output on the back, basically making it a video card for the Amiga. The 3D printed bracket holds the card in place and adds the external VGA and antenna in the back, as well as holding the ESP8266 in place internally for the GBS Control upgrade to the GBS8200/8220.


The 74HC08 IC is an AND-gate that buffers the H- and V-sync signals to protect the Amiga chipset. The C-sync is already buffered so it does not go through the gate. The two 47r resistors are there because the RGB connector on the back of the Amiga has them inline with the output, but the internal video slot does not. The 330r and 100r resistor create the voltage divider to bring down the C-sync to a voltage level the GBS can handle. Because this is on the adaptor you do NOT need to add a 100r resistor to the actual GBS8200 as described on installation descriptions. The two jumpers are there to select between C-sync and HV-sync. C-sync works best with normal PAL and NTSC video modes (15kHz) and changing between them for example when playing games and switching between games and Workbench. HV-sync works best in the higher resolution ECS productivity modes. Do not change between these modes with power on. I use C-sync because it works best with gaming and normal Amiga use.


The adaptor should be soldered to the back of the GBS8200/8220 at the locations marked by the arrows. Make sure it's straight first, though it doesn't have to be absolutely perfect. The locations are slightly different between the GBS8200 and the GBS8220, but they are within the reach of the openings.


The 3D printable parts are designed with the VGA connector set in by several millimeters so that the giant Amiga 2000 case can be placed as close as possible to the wall. Take two of hte VGA barrel screws from the GBS8200 and use them to attach the VGA-plug to the bracket from the outside. Four M3x10 screws hold the case together if you go for the fully enclosed version. Two screws are enough if you just use the small bracket. You need to make an extension from the GBS8200 to the external VGA connector yourself. Soldering to the pads of the header on the back of the board is fine if you don't want to add a header connector, or just remove the header and solder wires into the holes. To install the antenna fist put the nut into the cavity on the outside of the bracket and then screw the antenna from the inside of the bracket/case. It will look very clean and low profile from the outside.


About the optional GBS Control upgrade:

https://github.com/ramapcsx2/gbs-control

GBS Control is a fantastic upgrade for GB-82*0 cards that provides lag fre and very good scaling with a WIFI GUI accessible via WIFI.

Here's info on how to connect the ESP8266 and clock generator: https://github.com/ramapcsx2/gbs-control/wiki/Build-the-Hardware


He deserves some support if you use his work: https://www.buymeacoffee.com/ramapcsx2


The ESP8266 can be programmed via the hole in the bracket, but it should not be done with the card installed in the Amiga 2000 as it will try to power the Amiga up via the USB 5V. Remove the card for reprogramming.



Project Tags (Optional, add up to 6 keywords)
Amiga
2000
gbs8200
gbs8220
gbscontrol
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Front cover for the fully enclosed version. Designed to be printed with normal FDM printer settings and 0% infill.
A2000-GBS04.STL
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Back cover for the fully enclosed version. Designed to be printed with normal FDM printer settings and 0% infill.
A2000-GBS05.stl
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Small bracket for installation without a complete enclosure of the card. Designed to be printed with normal FDM printer settings and 100% infill.
A2000-GBS02.STL
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