ZRC has no real ROM.  It has a single 2048K RAM chip.  There
are two startup modes supported by RomWBW.

The normal startup mode treats the first 512KB like ROM and the
remaining 1536KB as RAM.  The first 512KB (pseudo-ROM) must be preloaded
by the ZRC CF Loader.  This mode simulates a normal ROM-based RomWBW
startup.

Bank		Contents	Description
----		--------	-----------
0x0		BOOT		Boot Bank (HBIOS image)		+
0x1		IMG0		ROM Loader, Monitor, ROM OSes	|
0x2		IMG1		ROM Applications		| Pseudo-ROM
0x3		IMG2		Reserved			|
0x4-0xF		ROMD		ROM Disk Banks			+
0x10		BIOS		HBIOS Bank (operating)
0x11-0x3B	RAMD		RAM Disk Banks
0x3C		BUF		OS Buffers (CP/M3)
0x3D		AUX		Aux Bank (CP/M 3, BPBIOS, etc.)
0x3E		USR		User Bank (CP/M TPA, etc.)
0x3F		COM		Common Bank, Upper 32KB

The ROMless startup mode treats the entire 2048KB as RAM.  However, in
this mode, only the first 512KB of RAM is utilized.  This is because
the RAM Disk is seeded by the CF Loader which is currently constrained
to loading 512KB.  The entire 512KB of RAM (less the top 32KB) must be
preloaded by the ZRC CF Loader.  There will be no ROM disk available
under RomWBW.  There will be a RAM Disk and it's initial contents will
be seeded by the image loaded by the CF Loader.

Bank		Contents	Description
--------	--------	-----------
0x0		BIOS		HBIOS Bank (operating)
0x1		IMG0		ROM Loader, Monitor, ROM OSes
0x2		IMG1		ROM Applications
0x3		IMG2		Reserved
0x4-0xB		RAMD		RAM Disk Banks
0xC		BUF		OS Buffers (CP/M3)
0xD		AUX		Aux Bank (CP/M 3, BPBIOS, etc.)
0xE		USR		User Bank (CP/M TPA, etc.)
0xF		COM		Common Bank, Upper 32KB
