System information

Table 3-7. (continued)
Form with
Bit Value Example Meaning
IN e8 IN 0 Load register A with data from port e8.
OUT e8 OUT 255 Send data from register A to port e8.
XTHL Exchange data from top of stack with HL.
PCHL Fill program counter with data from HL.
SPHL Fill stack pointer with data from HL.
XCHG Exchange DE pair with HL pair.
3.5.5 Arithmetic Logic Unit Operations
Instructions that act upon the single-precision accumulator to perform arithmetic and logic
operations are given in the following table.
Table 3-8. Arithmetic Logic Unit Operations
Form with
Bit Value Example Meaning
ADD e3 ADD B Add register given by e3 to accumulator without carry. e3 must
produce one of A, B, C, D, E, H, or L.
ADC e3 ADC L Add register to A with carry, e3 as above.
SUB e3 SUB H Subtract reg e3 from A without carry, e3 is defined as above.
SBB e3 SBB 2 Subtract register e3 from A with carry, e3 defined as above.
3.5 Operation Codes CP/M Operating System Manual
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