By Virginia Williamson
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Extra info for Byte - July 1976
Immediate " type commands require two consec utive words. JUMP and CALL com mands requ ire three co nsecutive words. The remaining types on ly req uire one word. The first group of instructions to be presented are those that are used to load data from one CPU register to another, or from a CPU register to a word in memory, . or vice-versa. This group of instructions requires just one word of mem ory. It is important to note that non e of the instructions in this group affect the nags . LOAD DATA FROM ONE CPU REGISTER TO ANOTHER CPU REGISTER MNEMONIC LAA LBA LAB MACHINE CODE 300 310 301 The load register group of instructions allows the programmer to move the contents of one CPU register into another CPU register.
They are used to bring in data from memory where it can be operated on by the CPU. Or, to temporarily store intermediate results in the CPU registers during complicated and extended calculations, and of course allow data, such as results, to be placed back into mem ory for long term storage. Since none of them will alter the contents of the four CPU flags, these instructions can be called upon to set up data before instructions that may affect or utilize the flag 's status are executed. The programmer will use instructions from this set frequ ently.
LOAD DATA FROM ANY CPU REGISTER TO A LOCATION IN MEMORY 370 371 372 373 374 . 375 376 LMA LMB LMC LMD LME LMH LML This instru ction is very similar to the previous group of instructions except t hat now the con ten ts of a CPU register will be loaded into a specified memory location. The memory location that will receive the contents of the particular CPU register is that whose address is specified by the contents of the CPU Hand L registers at the time the instruction is executed. The H CPU register specifies the HIGH portion of the address desired, and the L CPU register specifies the LOW portion of the address into which data from the selected CPU register is to be loaded .