Scelbi's Galaxy Game for the 6800 by Robert Findley

By Robert Findley

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7. What can be contained in the operand field? 8. What is a prebyte? What does it tell the processor to do? 2 9. What is an effective address and how is it used? 10. When using the absolute addressing mode, where is the operand? 11. What is the difference between immediate and inherent addressing modes? 12. Which addressing mode is used when the data is implied? 13. What makes indexed addressing unique? 14. Relative addressing mode does not process data in the same sense as the other addressing modes.

From memory to the processor registers 3. from one processor register to another processor register. NOTE: The HC11 does not support instructions that allow direct memory to memory transfers using a single instruction. An example of how to accomplish memory to memory transfers is provided in chapter 5. 4. Load instructions perform an input operation by reading one or more bytes of data into a processor register from memory. Each of the load instructions that copies two bytes of data follows the “high byte first” convention.

HC11 Programming a. LDAB #$16 b. LDX $10 c. LDY $0123 d. LDAA $B600 Solution: a. Bytes = 2. LDAB IMM will occupy two bytes, the first byte is the opcode and the second is the operand (ii). Opcode = $C6. Cycles = 2, 1 fetch and 1 execute. b. Bytes = 2. LDX DIR will occupy two bytes, the first byte is the opcode and the second is the low-byte of the effective address (dd). Opcode = $DE. Cycles = 4, 1 fetch and 3 executes. c. Bytes = 4. LDY EXT will occupy four bytes, the first byte is the prebyte, the second is the opcode and the last two are the first effective address of the operand (hhll).

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Scelbi's Galaxy Game for the 6800 by Robert Findley
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