![]() ![]() With a 12v PSU the regulator gets hot.x2VGA converts old TTL video signals like MDA, Hercules, CGA, EGA or any industrial non- standard TTL video signal to VGA. The board does not provide an option for power output on the HD15 connector. Description Digital video converter x2VGA achieves the conversion of any digital TTL video signal to VGA.Pin 13 of the GAL is tied to GND, and is currently used to switch between detection modes (CGA/MDA/HERCULES vs CGA/EGA).✅ means I tested the functionality and it works, ❌ means I tested the functionality and found issues, ? means that the functionality has yet to be tested. ![]() You're encourauged to take what you deem fit from this, and use it in your projects! Functionalities Your computer might crash, catch fire or be destroyed in other nasty ways. I take NO responsibility for what happens if you decide to build and use this card. Pics!Įxample of a low-res EGA game, with palette choosen between the 64 EGA colors (instead of the 16 CGA colors) You will need a monitor capable of syncing to 15, 18 and 21Khz. This board does NOT perform any frequency conversion. It is recommended to use an 'LS244 as the output buffer, an LS or an HCT is fine for the input. The PLD is sandwiched between two '244 buffers to protect it from shorts and allow the user to experiment with different logic families to better handle the input. The board uses a GAL20V8 PLD to implement the conversions, sync polarity detection, brown-fix, etc. This board converts CGA/EGA/MDA/Hercules TTL signals into analog RGB signals that can be fed into a compatible monitor.ĭepending on jumper settings, it can automatically detect MDA/Hercules and Hi-res EGA modes (uses vsync polarity detection), can be forced into low-res 64 colors EGA and can perform the "brown-fix" for CGA. Provides one RS232 to TTL/CMOS adaptionSupports 4-signal RS232 Conversion: (TxD, RxD, RTS, CTS, and GND)Supports DB-9 Female (DCE) to DB9 Male (TTL/CMOS) Connector ConversionSupports 5V and 3.3V Tolerance SignalsSignal levels are inverted by the converter similar to standard RS232 but in TTL/CMOS swing levelSupports baud rate up to 115.2 KbpsPort-Powered, no external power requiredNo driver required fo all operating systems.MDA/CGA/EGA/HERCULES TTL-to-ANALOG Converter Introduction The converter does not require DC power from an outside source, it is powered by the RS232 signal. This TTL/CMOS converter is designed for PC, Workstation, thin client, or server providing instant conversion to devices needing a RS232 interface.Ĭonnect the RS232 TTL converter directly to your PC's female DB-9 COM port, supports standard RS232 signals TxD, RxD, RTS, CTS, and GND. The RS232 to TTL converter can be used in CMOS conversion also for RS232 interface with TTL or CMOS voltage level. RS232 to TTL Converter for PC and Workstation ![]()
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