PiTubeDirect VS Core

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

Ultibo is amazing for this kind of stuff:

https://ultibo.org/

My concern is that the Pi Zero boards are short on memory - Chromium can be best described as a pain on these boards... Possibly something like Ultibo could be used to give you a bare metal front end. This would give good performance but it may be a steep learning curve if you have not come across the development toolset (Pascal derived)...

Nope

>Note that the Raspberry Pi Pico is not supported by Ultibo core as it is based on a microcontroller instead of a microprocessor and is not able to support the features required by Ultibo core.

https://github.com/ultibohub/Core

https://ultibo.org/wiki/Supported_Hardware

One possible option is to use https://ultibo.org/ - it's based around Free Pascal but the result runs on almost 'bare metal' so it's fast starting and quick to run. You would need to agree with the GNU LGPL version 2.1 licence but there is an exception for closed source development. Though you can draw graphics by direct access to the video buffer it's really designed for character output as there are no tools for buttons / windows etc.

It doesn't necessarily mean assembly, just the absence of a separate operating system. It looks like Ultibo is mostly written in Pascal, with a small amount of inline assembly to initialize the hardware, etc.

https://github.com/ultibohub/Core/blob/master/source/rtl/ult...