RGBtoHDMI VS PiTubeDirect

It's very DIY, and doesn't see much love from the Apple community, but RGBtoHDMI has a great support community. It seems that Raspberry Pi Zeros are back on the market again, too

RGBtoHDMI (reseller)

If you are already going the extra mile, you can convert directly from the TTL signals to HDMI with the RGB2HDMI adaptor.

https://github.com/hoglet67/RGBtoHDMI/wiki/Supported-Computers lists "Commodore 128-80col"

RGBToHDMI works on a lot more systems. https://github.com/hoglet67/RGBtoHDMI/wiki/Supported-Computers has the full list but it's pretty much all 8 and 16 bit computers.

My advice is to forget about trying to find a monitor that will accept the signals directly and just get an upscaler instead. Depending on the computers, you may be able to use an RGB2HDMI, or you could use an OSSC with a CGA2RGB to convert TTL RGB/monochrome to analog.

Just to expand your options a bit, you can also use a 15 kHz analog RGB monitor (Amiga monitor, PVM, modded consumer TV, etc.) with a CGA2RGB, or an HDMI monitor with an RGBtoHDMI.

See also, PiTubeDirect[1], which runs on a Raspberry Pi which you have plugged into the second processor port of a BBC Micro[2], and turns the Pi into emulator for a number of different processors, notably an arbitrarily fast 6502, a Z80, or an 80286.

[1]: https://github.com/hoglet67/PiTubeDirect

[2]: https://en.wikipedia.org/wiki/BBC_Micro_expansion_unit#Secon...

IMHO this makes the PiTube Direct project perhaps even more impressive: it attaches emulated vintage microprocessors to the BBC Micro Tube interface, implementing the Tube circuitry in software.

https://github.com/hoglet67/PiTubeDirect

BBC Micro/Master - PiTubeDirect - emulates a load of second CPUs for for BBC. Lets you run CP/M, DOS.

It's a shame he desoldered the tube connector. He could have used it for a pitubedirect (https://github.com/hoglet67/PiTubeDirect)

There's a similar project for the Acorn BBC Micro called PiTubeDirect, which allows the Pi to emulate several different CPUs, while connected to the BBC Micro's "tube" second processor slot.

https://github.com/hoglet67/PiTubeDirect

(The BBC Micro itself was quite remarkable for supporting multiple processors, which did not have to be the same architecture as the host 6502.)

If you ever do want to play with Tube like this, I've heard of https://github.com/hoglet67/PiTubeDirect - not got around to trying it yet - but I want to.

I expect the tube version will be for 6502 3mhz, but worry not! https://github.com/hoglet67/PiTubeDirect/wiki