By Richard Mansfield
ISBN-10: 0942386531
ISBN-13: 9780942386530
Read Online or Download Second Book of Machine Language: Personal Computer Machine Language Programming for the Commodre 64, VIC-20, Atari, Apple, and PET CBM Computers PDF
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Additional info for Second Book of Machine Language: Personal Computer Machine Language Programming for the Commodre 64, VIC-20, Atari, Apple, and PET CBM Computers
Sample text
By now, the variety of possible addressing modes has been somewhat narrowed. If we did find a comma in that second-from-last position, that means the label ends in ,X or ,Y and we go to XYTYPE to deal with it. Otherwise, we check to see if it's a JMP (opcode 76). MEV eliminates two other possible modes, both Zero Page, sending LADS to the TWOS, two-byte, line-ending events. We're headed for TWOS by now in any case, but we need to once again adjust the value of the opcode in OP if the type in TP isn't 6 or 4.
So if HEXFLAG is BNE, not equal to zero, it's up and we can jump right down to L340, which starts to figure out the addressing mode. If the EXPRESSF is up, that means a word label, not a number, so we have to go to EVEXLAB to 42 Eval: The Main Loop get the number to substitute for the label. Otherwise, we've got a decimal number to work with as our argument (1730). The whole function of lines 1730-1840 is to have the variable TEMP pointing to the first ASCII number in the label. That's why we keep INCrementing TEMP until we point to a character that is not BCe, less than the 0 ASCII character (48) in line 1830.
So we can detect from a zero that there is no argument and, hence, this is a case of Accumulator addressing. If it is, we need to add 8 to the base opcode for these bit-movers and then jump to the type 1 exit. If it isn 't, we've already turned it into a type 1 (970) and from here on, we'll treat it as a member of that family. In effect, type l's can have several addressing modes, so we must evaluate the mode. We go to EVGO. Fat Y Loops Before entering most ML loops, you 'll first LOY #0 . Y often functions as a counter, so it's set to zero, and then INY occurs 38 Eval: The Main Loop at the end of the loop.
Second Book of Machine Language: Personal Computer Machine Language Programming for the Commodre 64, VIC-20, Atari, Apple, and PET CBM Computers by Richard Mansfield
by Richard
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