By Virginia Williamson
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Extra resources for Byte - July 1976
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The contents of the destination (to) register becomes the same as the originating register. Any CPU register can be loaded into any CPU register. Note that loading register A into register A is essentially a NOP (no operation) command. When using mnemonics the load symbol is the letter L followed by the "to" register and then the "from" register. The mnemonic LBA means that the contents of register A (the accumulator) is to be loaded into register B. The mnemonic LAB states that register B is to have its contents loaded into register A.
25 Misc. •. 50 4002-1 $ 7. 00 Please send for complete l isting of IC's and Xistors at co mpetitive prices. MIKOS 419 Portofin o Dr. San Carlos , Calif. 5usec Check or money order only . calif. residents 6 % tax . 00 orders postpaid in US. All devkes tested prior to safe. Money back 30 day Guarantee. $10 min. order . Prices subject to change without notice. Reprinted from . MACHI NE LANGUAGE PROGRAMMING FOR THE "8008" (and similar microcomputers) . Author: Nat Wadsworth Copyright 1975 Copyright 1976 - Revised Scelbi Computer Consulting Inc With the permission of the copyright owner.
The CHRPR subroutine is used to disp lay (or print) a single character. These routines are not shown in the listings, but shoul d be adapted from the routines normally used with the particular system in which the program is run. Both KEYBD and CHRPR use the accumulator (A) to pass a single character argument. KEY BD defines a value in A obtained from the input device. CHRPR displays the value in A on a device such as a video display or Teletype. Al l other registers of the 8080 processor should be left unchanged upon return from either of these routines.