zxbus more refactoring

[holub]

@cuavas that's almost everything you suggested, but I need:
#13202 - to complete tsconf
... and work on solution for the Sprinter, because it requires setup through ISA's io_space, which atm a bit challenging for me.

PS automerge is conflicting because it contains both merged and updated commits

[holub]

Given none else but Sprinter needs this, I'll create local space with desired view there and install to ISA.
This will keep zxbus implementation clean.

[holub]

something among this lines 4d4d9b2 for Sprinter/ISA but I can't figure out proper lifecycle where I can install device to io space.

[cuavas]

Can you explain the slots on the Sprinter? It has an ISA slot and a ZX Bus slot? Does the ISA card’s I/O space appear directly in the Z80 I/O space? Does the ZX Bus slot share its I/O space with the ISA card? The ISA card is going to be unaware of the state of the “shadow” line on the ZX Bus slot, right?

[holub]

Can you explain the slots on the Sprinter? It has an ISA slot and a ZX Bus slot? Does the ISA card’s I/O space appear directly in the Z80 I/O space? Does the ZX Bus slot share its I/O space with the ISA card? The ISA card is going to be unaware of the state of the “shadow” line on the ZX Bus slot, right?

It has only 2 or 4 ISA slots. But you can use adapter and put zxbus cards to it.
But you can't use zxbus devices same way as in zxspectum. You communicate with ISA through the memory and this IO is redirected to zxbus cards

[holub]

Regarding DOS signal... Not all clones have it. Card can "define" it based on the MEMR. But I don't really want to share mem with zxbus (at least now without necessity as it makes whole emulation much slower)
As of now we only have smuc card which cares about DOS in zxbus - and it's only supported in Scorpion, so I split it to separate config.

[holub]

Hold on looking at Sprinter part. I'm adding isa_zxbus card for adapter. Will see if it works.

[holub]

@cuavas when ever you have time, can you check please zxbus_adapter? Looks like all installations happen on time now but for some reason reads and writes are unmaped now.

[holub]

I see m_address_mask == 0 and not sure how to fix it

[holub]

ready for review. just waiting for #13253