GLUE banking not emulated, causes detection problems

[synacknet]

IIx RAM mirroring doesn't seem to be quite right. It works fine in 24bit mode, which is all the stock ROM supports, and works with the IIsi ROM in 24bit, but chimes of death with 32bit. This works on a physical IIx.

[synacknet]

This is actually a result of several problems:

1. only bank 1 is emulated.
2. GLUE bank stitching is not emulated.
   This kinda worked before because the GLUE wasn't being properly detected and the ROM was defaulting to an "unknown" memory controller that had everything contiguous, which is more or less what is being emulated. This should really emulate both banks, properly handle accesses to a bank where no memory is installed, and the VIA2 bits for stitching the banks together.

Until then, emulating 128MB works because that will span both banks, so no stitching is required, there's no unpopulated bank space, and no mirroring across the banks.