Questions tagged [8085]

For questions about the 8085 8-bit microprocessor

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17
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1answer
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Which undocumented 8085 instructions is Steven Morse referring to in “In The Beginning”?

In S. P. Morse's 1980 allegory, "In The Beginning", he writes And Intel said, "Let there be an 8085 with an oscillator on the same chip as the processor, and let an on-chip system controller ...
3
votes
1answer
804 views

Carry flag in 8080/8085 subtraction

How is the carry flag set during a subtraction by the 8080 or 8085 processor? For addition, the carry flag is set if the result is greater than 255 (i.e. if it overflows). From the programmer's ...
11
votes
1answer
595 views

8080/8085 Instruction Test Suite

(This question was inspired by Comprehensive test suites for MOS 6520 PIA / 6522 VIA / 6526 CIA) Is there a comprehensive test suite for the Intel 808X series of processors? Something that would ...
8
votes
2answers
778 views

Intel 8080 Read/Set Interrupt Mask Instructions

According to Intel's 8080-8085 Assembly Language Programming guide, the OP Code 20 corresponds to the Read Interrupt Mask (RIM) instruction, and 30 corresponds to the Set Interrupt Mask (SIM) ...