AltairZ80: The Big Beautiful PR

[deltecent]

This PR contains the following:

Adds a new SD Systems SBC200 device.
Adds a new SD Systems VFII VersaFloppy II device.
Adds ability to load HEX files at a specified address.
Adds support for SD Systems ExpandoRAM banked memory.
Adds improved DSK image support to the WD179X device.
Adds support for formats that don't include the FC index mark to WD179X WRITE_TRACK command.
Fixed WD179X VERIFY register.

SD Systems uses the high bit of the SIDE byte of a disk's 6-byte sector ID field to identify a double-sided disk. A DSMASK register was added to WD179X device. When a READ ADDRESS command is issued, the value of this register is ORed with the SIDE number. For example, if DSMASK is set to 80H, 80H is returned for Side 0 and 81H is returned for Side 1.

This PR passes Howard's AltairZ80 tests.

Additional tests were added here:

https://github.com/deltecent/altairz80-tests/

Additional packages were added here:

https://github.com/deltecent/altairz80-packages/

[markpizz]

Patrick,

As you keep force pushing your changes, please change the commit message to something more appropriate.

Thanks,

Mark

[deltecent]

Sorry about that... trying to fix stuff failing in the automatic build checks.

[deltecent]

Included PR #492 in scp.c
Replaced binary notation with hex notation in s100_scb200.c

[pmetzger]

Why did this get closed?

[deltecent]

This PR got stalled. I think it is too many changes touching too much stuff for one PR. It also touches the same code as
#484 which is also stalled and generated another that hasn't made it through consensus yet. I am going to wait for some of these other PRs to make it through the pipe and then submit separate PRs. Sometimes they want only one commit. Sometimes more than one commit. I'm just not that good at Git to keep things in order and work on other branches while this one is in limbo. It is much easier to wait it out and start over.