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INTR, RST5.5, RST6.5, RST7.5, and TRAP are external interrupts in the 8085.
INTR is the original style used in the 8080. It uses an INTA response and the external hardware is expected to provide an instruction to execute, typically a CALL or an RST.
RST5.5, RST6.5, and RST7.5 are non-INTA interrupts, where there is no expected response for acknowledgement. RST5.5 and RST6.5 are level triggered, and RST7.5 is edge triggered.
TRAP is similar to the RST interrupts in that there is no acknowledge sequence. It is both edge and level triggered. Further, it is non-maskable.
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