DMA/CPU accelerator board

[GUNHED]

If you are going to make a Z80 on a board, why not two?

https://archive.org/details/byte-magazine-1978-07

see page 60.

Nice!

At home I have a Genie IIIs with an 8 MHz Z80 and it got a nice (similar to ECB) expansion bus internally. There is the Ultra/8 card added: It contains another Z80 with own 64 KB RAM.
However, both Z80 CPUs can access the same RAM area (can be defined in size and location)
Very nice system, but today I know only one other person working with that power machine too.