By Allan E. Moose, Marian J. Lorenz
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Remember that in absolute addressing the two bytes following the op-code specify the address of the data to be manipulated . In absolute indexed addressing, the contents of either the X or Y register are added to an abso lute address to determine the actual memory location used. One of the primary uses for this addressing mode is to access the elements of a table or array. Zero Page Indexed Addressing: This form of indexed addressing is very similar to abso lute indexed addressing. The contents of either the X or Y register are added to the operand to obtain the actual memory location used for the data.
I DECIMAL BINARY HEX 0 1 2 3 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0 1 2 3 4 5 4 5 6 7 8 9 10 11 12 13 14 15 6 7 8 9 A B C D E F 32 Atari Assembly Language Programme(s Guide Conversion of a binary number into hexadecimal is straight forward. Separate it into its groups of four bits and write the hex equivalent of each group: 10 1" - .. 1 .... \-1- 1-- = AF or Conversion from hexadecimal to binary is equally simple: A9 = 1 01 0 t 1 00 1 t 9 A Conversion from hexadecimal to decimal can be done using the recursive rule [previous result*base]+[next digit]=result rule.
Convert from decimal to Hi-Byte, La-Byte form: 1. 1536 2. 53768 3. 53762 4. 53249 5. 54282 6. 54286 7. 58466 Number Systems and Hardware 35 B. 22F 2. 230 3. 26F 4. 2F4 5. D407 6. E45F 7. D20E C. 255 2. 198 3. 228 4. 195 5. 219 7. 63 Codes As well as using the digits zero and one to represent numbers in binary form, sequences ofO's and I 's can be used as codes to represent characters, special symbols, and instructions to peripheral devices. Such codes permit communication between the computer's central processor unit (CPU) and the keyboard, TV screen, and printer.