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Rev

Note that the "tube" connector on the BBC micro was just a connection to the processor bus. The actual tube chip was in the second processor unit. It looks like it was released in 1984. As I understand it in addition to a "DNFS" rom containing among other things code to support the tube, it also required the BBC micros operating system to be version 1.2.
– Peter Green
Commented Mar 29, 2021 at 11:56
Not really an answer. While this could have been done, from memory the Tube was used for a 2nd CPU not for advanced GPU offload which is what the OP asks.
– Stilez
Commented Mar 30, 2021 at 5:05
1

@Stilez Once the 2nd CPU was attached, the original computer became the GPU and I/O offload engine. The Z80 version was also commonly used with an actual desktop GUI, though a relatively primitive one.
– Chromatix
Commented Mar 30, 2021 at 5:18

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