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Stack, Stack pointer and Subroutines in 8085 - Technobyte
WebThe four condition codes in the processor status word (PSW) are N indicating a negative value Z indicating a zero (equal) condition V indicating an overflow condition, and C indicating a carry condition. Instructions in this group were what Digital called "micro-programmed": A single bit in the instruction word referenced a single condition code. WebNov 11, 2024 · Offset 274 in the load module is the start of a routine called $$PRTOUT, which somehow seems to relate to the PRINTOUT macro seen in the assembler source. So, register 15 is pointing at the entry point of routine $$PRTOUT. This indicates that register 15 has been loaded with the entry point address of routine $$PRTOUT. shoreton bungalow culbokie
How read data in PSW (program status word) in IBM mainframe
WebThe instruction address in the current PSW is replaced by the branch address if the condition code has one of the values specified by M 1 ; otherwise, normal instruction sequencing proceeds with the updated instruction address. Since POPs didn't say otherwise, we can assume the registers being used are the General Purpose Registers. WebThe carry (borrow) flag is also set if the subtraction of two numbers requires a borrow into the most significant (leftmost) bits subtracted. 0000 - 0001 = 1111 (carry flag is turned on) Otherwise, the carry flag is turned off (zero). 0111 + 0001 = 1000 (carry flag is turned off [zero]) 1000 - 0001 = 0111 (carry flag is turned off [zero]) WebSep 23, 2024 · The programmer can use the stack to store data. And the microprocessor uses the stack to execute subroutines. The 8085 has a 16-bit register known as the ‘Stack Pointer.’. This register’s function is to hold the memory address of the stack. This control is given to the programmer. The programmer can decide the starting address of the ... sandusky is in what county