The GBS-8220 is typically a V3 board, the GBS-8200 a V4 board. The GBS-8220 is a dual output board, the GBS-8200, which I have, has a single VGA output. There are two versions of the board available and two similar models. Playing with the software settings is for the next post on this topic, this one deals with the hardware.
Whilst researching the devices on the board, I came across a thread the the SHMUPS (an abbreviation of Shoot-em-ups) board who has played with the software,, this provided a link to the programming guide, which I did not have. A list of 21 items to test was created and depending on the results, I hoped to improve the basic video connections and obtain reliable, proper colour video images!
Being an Electronic Engineer with 16 years experience, I was dubious about this and set about investigating the board. There are numerous forums posts that state to get the best out of this board you need a 5V high current, good quality, power supply and you should replace the electrolytic capacitors with higher quality ones. With this in mind I ordered a GBS-8200 board from Ebay and waited. Since 2006 I have been involved with developing video systems for my day job and have gained some valuable experience in interfacing ‘non-standard’ video to modern displays. I was initially drawn into the investigation after answering a few questions on display issues on the EAB forum, and subsequent conversations in another topic,, both threads are quite long. Various issues have been reported, from a complete lack of signal to poor video to speckles on the display and problems with moving video.
You may have seen on ebay and quite a few arcade accessory sites, a number of “GBS-8220 RGB / CGA / EGA / YUV to VGA Arcade Games HD Video Converter Boards”, which for the low cost promise a cheap solution to connecting a modern LCD monitor to retro consoles and video arcade systems. Based on user experiences posted on various message boards, the device does not always deliver. GBS-8200 and GBS-8220 experiments part 1 GBS-82XX experiments part 2 now posted here (26th Jan 2015)
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