IBM-compatible computers have ROM and I/O device memory not available for program use in the range from 640 KB to 1 MB, and after the MINIX 3 boot monitor relocates itself below the 640-KB limit the memory available for program use is further reduced. In Fig. 4-44, how much memory is available for loading a program in the region between the kernel and the unavailable region if the boot monitor has 52256 bytes allocated to it?

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ds text data CS 0000800 0005800 19552 3140 2356 0100000 0104c00 19456 0111800 011c400 43216 5912 070e000 070f400 4352 616 bss 30076 48612 6224364 4696 stack 0 kernel 1024 pm 2048 fs 131072 rs Figure 4-44. Boot monitor display of memory usage of the first few boot image components.