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What is it? The PICO9918 is an open-source drop-in replacement for the classic TMS9918A VDP driving the displays of many 80's computers and consoles. It is powered by the mighty RP2040 microcontrolle…
Read More…The PICO9918 is an open-source drop-in replacement for the classic TMS9918A VDP driving the displays of many 80's computers and consoles. It is powered by the mighty RP2040 microcontroller of Raspberry Pi Pico fame.
It can be used to replace the TMS9918/TMS9918A/TMS9928A/TMS9929A/TMS9118 of these machines, providing crisp VGA output and enhanced features. The PICO9918 doesn't require an external crystal or VRAM, so can also be used in cases where your video crystal, video RAM or display circuitry is bad.
So far, the PICO9918 has been tested on the following systems:
Homebrews:
I expect this list to grow as more people try it out. I can't guarantee it will work on any system not listed above, however there is a fair chance it will.
If you test it on a device not listed, please let me know and I'll add it to the list. If it doesn't work, I'll start an unsupported devices list.
The PICO9918 is also a great choice for homebrew builders who would like to add retro graphics output to their homebrew builds with minimal fuss since it requires no external componentry to function.
The hardware and firmware is completely open source, allowing you to make modifications and design your own VDP features... in C.
The full source code and firmware binaries is available on GitHub: https://github.com/visrealm/pico9918
Note: By default, your PICO9918 will be shipped with CRT mode enabled which provides a CRT-like scanline effect. If you prefer a crisp VGA image, you can apply the "nocrt" firmware which is available in the Releases section of the GitHub repository.
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Roy | Sept. 21, 2024
Ashton | Sept. 7, 2024
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