CRG | Amiga 2000(EATX) internal GBScontrol build @CRG | Uploaded July 2023 | Updated October 2024, 3 hours ago.
We all know that the best video signal for native Amiga screen modes is that coming from the RGB port but as a 15kHz signal it typically can't be connected straight to a modern display. There are various scan doubler devices out there and one of the cheapest is the GBS8200. Cheapness usually equals poor quality though and while the GBS8200 does a decent job the image isn't the best. That's were GBS Control comes in though. This mod replaces the GBS processor with an arduino device running custom software that aims to fix the problems with the original device. There are further mods we can do to try and get every last ounce of quality out of the scan doubler and we can now even mount it to a daughter board to fit it internally in an Amiga 2000 or in my case an Amiga 2000 EATX.
The GBS to A2000 board can be found here - pcbway.com/project/shareproject/Amiga_2000_Video_Card___Adaptor_for_mounting_GBS8200_internally.html
CRG Twitter - twitter.com/YT_CRG
CRG Patreon - patreon.com/user?u=13919007
CRG Discord - discord.gg/3hEzUxTxWV
Music - Cathode Ray Gun by @Momentvm
Chapters
00:00 Intro
01:59 Picture from GBS8200
04:58 GBS Control installation
05:34 Programming
07:27 Wiring
11:05 Testing
13:29 C11 mod
16:09 Admission
17:10 Faulty GBS?
19:01 Testing
21:14 RGB pots and sync mod
26:54 Testing
27:18 SI5351 clock generator mod
29:03 Testing
29:46 Power supply bypass caps mod
32:19 Testing
32:51 A2000 video port mod
37:25 Testing
38:54 Comparing GBS8200 to GBScontrol
40:30 Conclusion and Credits
We all know that the best video signal for native Amiga screen modes is that coming from the RGB port but as a 15kHz signal it typically can't be connected straight to a modern display. There are various scan doubler devices out there and one of the cheapest is the GBS8200. Cheapness usually equals poor quality though and while the GBS8200 does a decent job the image isn't the best. That's were GBS Control comes in though. This mod replaces the GBS processor with an arduino device running custom software that aims to fix the problems with the original device. There are further mods we can do to try and get every last ounce of quality out of the scan doubler and we can now even mount it to a daughter board to fit it internally in an Amiga 2000 or in my case an Amiga 2000 EATX.
The GBS to A2000 board can be found here - pcbway.com/project/shareproject/Amiga_2000_Video_Card___Adaptor_for_mounting_GBS8200_internally.html
CRG Twitter - twitter.com/YT_CRG
CRG Patreon - patreon.com/user?u=13919007
CRG Discord - discord.gg/3hEzUxTxWV
Music - Cathode Ray Gun by @Momentvm
Chapters
00:00 Intro
01:59 Picture from GBS8200
04:58 GBS Control installation
05:34 Programming
07:27 Wiring
11:05 Testing
13:29 C11 mod
16:09 Admission
17:10 Faulty GBS?
19:01 Testing
21:14 RGB pots and sync mod
26:54 Testing
27:18 SI5351 clock generator mod
29:03 Testing
29:46 Power supply bypass caps mod
32:19 Testing
32:51 A2000 video port mod
37:25 Testing
38:54 Comparing GBS8200 to GBScontrol
40:30 Conclusion and Credits
