25 lines
945 B
Markdown
25 lines
945 B
Markdown
AnattOS
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=======
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AnattOS is a 512 byte memory editor with convenience features for hand
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programming machine code.
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Interface
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256 bytes of memory are show in a 16 by 16 grid. Each line of 16 bytes is
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checksummed with Fletcher-16, and the checksum is displayed after the line.
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The address under the cursor is displayed below the memory dump.
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If the byte under the cursor begins an instruction where the opcode and
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mod-r/m bytes' fields have the standard meanings, the fields' meanings are
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decoded and shown below the address. Note that the case of mod=0 r/m=6 is
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not special cased, and will display `bp` for the r/m field.
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Arrow keys can be used to navigate the memory, and `r` to call into the
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address under the cursor. When returning to AnattOS the code should restore
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segment registers, direction flag, and stack pointer to the values they had
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upon entry.
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Limitations
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-----------
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AnattOS is only able to examine first 64KiB of RAM.
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