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22 lines
901 B
Plaintext
22 lines
901 B
Plaintext
ZSID BUGS
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From DDJ, Oct. 1982, p. 7
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ZSID doesn't interpret the LDIR instruction correctly when the
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operands (the two strings defined by the HL, DE and BC registers)
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overlap on each other. The LDIR (long move) instruction of the
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Z-80 copies a source string into a target string. When the target
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string overlaps on the source string (as when the source begins
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at 200h, the target at 201h and the length is 255 bytes) LDIR
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becomes a Replicate instruction, duplicating the leading byte
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of the source into the target over and over. ZSID doesn't handle
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it right, though; it stops after copying one byte.
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Also, the disassembler in ZSID doesn't seem to handle the LD A,R
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and LD R,A instructions. Its List command won't display them and
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its Assemble command won't accept them.
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The number -1 is not correctly interpreted. For example, LD HL,-1
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is interpreted as LD HL,00FF.
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