==== SCART to HDMI converters ====
SCART to HDMI converters are the cheapest and most simple solution. Make sure they (really) support RGB and not only composite video, like the cheapest SCART to HDMI converters usually do. RGB SCART converters start at around 30€ 40€ (20222025). They will usually work and you will probably first think, that this is perfect, but they can add a hefty lag to your screen, some add up to 120ms (or 6 frames). Also CRTC tricks often do not work so some games won't be playable.
[[File:ModernLCD Scart2HDMI.JPG|thumbnail|none|Typical Scart2HDMI box]]
It's fine if you only want to do a bit of BASIC programming or play adventures, but it could do some harm to fast action games.
==== Sega Genesis/Megadrive to HDMI converters ====
Those are similar to Scart to HDMI converters and can be a bit cheaper and are much smaller. However their connector is made for SEGA consoles so you will need mod it or build your own adapter to connect it to the CPC.
Pay attention to buy an adapter that supports RGB as some only support Composite Video.
Most adapters will not support advanced CRTC tricks like in Relentless or even Ghosts'n Goblins. However the "[https://kaicolabs.com/product/kaico-sega-saturn-2x-line-doubler-hdmi/ Kaico Sega Saturn 2x]" adapter does properly support CRTC scrolling like in Ghosts'n Goblins - only the very latest, advanced tricks like in Relentless will not fully work but at least display a picture with stuttered scrolling. You might need to update the firmware and adjust brightness settings with the software from the Kaicolabs homepage to properly use it. The adapter can be found for around €30 in online stores (as of 2025).
Another advantage: The adapters are so small that they can easily be placed inside the CPC to add an internal HDMI output.
==== Scan converters ====
[https://www.youtube.com/watch?v=2CnsQBGAuos The new star on the horizon.] An open source project, that combines a Raspberry Pi with some custom logic, to convert signals from home computers and home consoles to HDMI. For almost every computer there is a more or less different version of the board. You can build the RGB2HDMI yourself or buy a finished version, e.g. on sellmyretro.com . It's features are even beyond those of the OSSC and Framemeister. Its total price is somewhere between the GBS and the OSSC, depending on where you buy it. And its tiny. Its biggest disadvantage is, that you need a different version of the board per console or home computer (well - some computers share a similar signal, so e.g. for the BBC you can also use the CPC version, but e.g. an Amiga or an Amstrad Plus each need another converter version). Screen lag has not been measured yet for it, but it seems to be very low.
===== vga4cpc =====
This DIY project by forum user gregg is based on the Raspberry Pico and (as of November 2024) the only solution that supports most (all?) CRTC tricks. Even games like Relentless that do not render properly on any of the other scan doublers are perfectly playable and absolutely smooth. Hardware and software are publicly available and the scan doubler can be built for less than €30 (€10-€30, depending on shipping costs for the parts). Assembly should be doable for anyone with average soldering skills.
Github project: https://github.com/grzegorz-gr/vga4cpc
Forum thread: https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/vga-through-rpi-pico-how-many-colors-possible-on-border/
The only downside would be that it only supports the Amstrad CPC, so if you own other computers (or even a Amstrad Plus or GX4000), you still need another solution.
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* [https://github.com/ramapcsx2/gbs-control GBS Control for GBS8200]
* [https://www.youtube.com/watch?v=7VOsOuQ5mhM Screen Lag - explanation and comparison video]
* [httphttps://15khz.wikidotmiraheze.com org/wiki/Main_Page List of 15kHz compatible monitors]* https://15khz.net similar list
[[Category:Hardware]] [[Category:Peripherals]] [[Category:DIY]] [[Category:Graphic]]