rc2014: adapt to new RomWBW memory layout #1126
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RomWBW version 3.4 changed the memory layout, putting the HBIOS working copy into RAM bank 0. To prevent the Fuzix loader from overwriting HBIOS, store data for bank 0 temporarily in bank 4. Copy bank 4 to bank 0 immediately before starting the kernel, when no more RomWBW calls are needed. This works with older RomWBW versions as well, which had HBIOS in nRAM-2 and lower banks were free to use. Tested with RomWBW 3.2, 3.4, 3.5-dev.101 on Zed Pro.
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RomWBW version 3.4 changed the memory layout, putting the HBIOS working copy into RAM bank 0. To prevent the Fuzix loader from overwriting HBIOS, store data for bank 0 temporarily in bank 4. Copy bank 4 to bank 0 immediately before starting the kernel, when no more RomWBW calls are needed.
This works with older RomWBW versions as well, which had HBIOS in nRAM-2 and lower banks were free to use.
Tested with RomWBW 3.2, 3.4, 3.5-dev.101 on Zed Pro.