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anatomy. First, we have constants. Some of them are device-
specific, but some of them are always there. SYSVARS is the
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address at which the RAM starts on the system. System variables
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will go there and use 0x80 bytes. See B80.
HERESTART determines where... HERE is at startup. 0 means
"same as CURRENT".
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RS_ADDR is where RSP starts and PS_ADDR is where PSP starts.
RSP and PSP are designed to be contiguous. RSP goes up and PSP
goes down. If they meet, we know we have a stack overflow.
Then, we load the assembler and cross compilation unit, which
will be needed for the task ahead.
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(cont.)