Download 6502 Assembly Language Subroutines by Lance A. Leventhal PDF

By Lance A. Leventhal

OOsborne/McGraw-Hill 1982. Wrap fresh with part put on. Binding tight, publication sq.. best of publication has a few soiling. Pages are fresh with out names, marks or highlights. Proceeds gain the Oro Valley Library.

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BEQ EXAMC ;YES, EXAMC or EXAMC KEEP CHARACTER LOOKING • Branch to address DEST if the accumulator contains a letter between C and F, inclusive. DONE CMP #'C ;IS BCC DONE ;YES, DATA BELOW C? CMP #'G ;IS BCC NOP DEST ;YES, DONE DATA BELOW G? MUST BE BETWEEN C AND F Chapter 8 contains further examples of string manipulation. CODE CONVERSION You can convert data from one code to another using arithmetic or logical operations (if the relationship is simple) or lookup tables (if the relationship is complex).

4. Set the Zero flag if the data at the input port assigned to memory address 1700l6islB16. LDA CMP #$1B $170U 5. Load the Carry flag with the data from bit 7 of the input port assigned to memory address 33A5I6. ASL $33A5 Note that this instruction does not change the data in memory location 33A516 unless that location is latched and buffered. If, for example, there are eight simple switches attached directly to the port, the instruction will surely have no effect on whether the switches are open or closed.

If the values are signed, we must allow for the possible occurrence of two's complement overflow. This is the situation in which the difference between the numbers cannot be contained in seven bits and, therefore, changes the sign of the result. For example, if one number is +7 and the other is —125, the difference is CHAPTER 1: GENERAL PROGRAMMING METHODS 25 -132, which is beyond the capacity of eight bits (it is less than -128, the most negative number that can be contained in eight bits). Thus, in the case of signed numbers, we must allow for the following two possibilities: • The result has the sign (positive or negative, as shown by the Negative flag) that we want, and the Overflow flag indicates that the sign is correct.

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