6502-emulator.blogspot.com

Writing a 6502 emulator from scratch

Writing a 6502 emulator from scratch. Thursday, March 26, 2009. In this project i have written more macros than ever before. The main reason is the similarities between opcodes, that the way the read operands are similar. By using macros the opcode implementations can be kept down to 2-3 lines of code instead of 6-7, which makes it much easier to maintain. It is also generally faster implementing it as macros as real functions. Macros for addressing modes. Define READ BYTE IMM() read byte( PC ). Define R...

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Writing a 6502 emulator from scratch | 6502-emulator.blogspot.com Reviews

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Writing a 6502 emulator from scratch. Thursday, March 26, 2009. In this project i have written more macros than ever before. The main reason is the similarities between opcodes, that the way the read operands are similar. By using macros the opcode implementations can be kept down to 2-3 lines of code instead of 6-7, which makes it much easier to maintain. It is also generally faster implementing it as macros as real functions. Macros for addressing modes. Define READ BYTE IMM() read byte( PC ). Define R...

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1 skip to main

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3 read addresses

4 read byte imm

5 read data

6 stack bottom

7 case and imm

8 break;

9 case and zp

10 case and abs

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Writing a 6502 emulator from scratch | 6502-emulator.blogspot.com Reviews

https://6502-emulator.blogspot.com

Writing a 6502 emulator from scratch. Thursday, March 26, 2009. In this project i have written more macros than ever before. The main reason is the similarities between opcodes, that the way the read operands are similar. By using macros the opcode implementations can be kept down to 2-3 lines of code instead of 6-7, which makes it much easier to maintain. It is also generally faster implementing it as macros as real functions. Macros for addressing modes. Define READ BYTE IMM() read byte( PC ). Define R...

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6502-emulator.blogspot.com

1

Writing a 6502 emulator from scratch: Macros

http://6502-emulator.blogspot.com/2009/03/macros.html

Writing a 6502 emulator from scratch. Monday, March 9, 2009. Good progression this far! All the op-codes are now implemented. I have written more C macros than I ever thought I would do, but with 151 op codes with similar contents it really helps! I still need to go through them all to make sure they act correctly on flags, but I am able to run more and more advanced programs. It was very nice to see a nestled loop with software BRK-interrupts to work properly! Another 6502 based beauty, the Apple II.

2

Writing a 6502 emulator from scratch: Waving flags

http://6502-emulator.blogspot.com/2009/03/yesterday-i-read-some-on-performance.html

Writing a 6502 emulator from scratch. Wednesday, March 11, 2009. Yesterday I read some on performance tuning for emulator programming. I realized that I did at least one thing in a not optimal way. The N and Z flags, telling if the last operation resulted in a negative or zero result, should be handled lazy. My opcodes had macros calculating those flags for all instructions where it was applicable. That means that I called "Z =! Result" and "N =! Finally a nice Oric 1 motherboard:.

3

Writing a 6502 emulator from scratch: Total recall

http://6502-emulator.blogspot.com/2009/03/total-recall.html

Writing a 6502 emulator from scratch. Friday, March 13, 2009. Plans now are to add a new thread to my emulator, allowing access to memory and registers during execution. I need something like that to test and debug my processor. . After that I will implement some initial binary loading for my memory class. I should at least add a function that loads binaries to specified memory locations. There seems to be binary formats for this that I probably want to support as well. . View my complete profile.

4

Writing a 6502 emulator from scratch

http://6502-emulator.blogspot.com/2009/03/in-this-project-i-have-written-more.html

Writing a 6502 emulator from scratch. Thursday, March 26, 2009. In this project i have written more macros than ever before. The main reason is the similarities between opcodes, that the way the read operands are similar. By using macros the opcode implementations can be kept down to 2-3 lines of code instead of 6-7, which makes it much easier to maintain. It is also generally faster implementing it as macros as real functions. Macros for addressing modes. Define READ BYTE IMM() read byte( PC ). Define R...

5

Writing a 6502 emulator from scratch: Instructions

http://6502-emulator.blogspot.com/2009/03/instructions.html

Writing a 6502 emulator from scratch. Monday, March 9, 2009. Under Linux, my. Rite platform. I began trying to write it in KDevelop, the integrated development environment used by the KDE project. But after some hours I realized that I missed my Emacs editor so much that I switched to my normal setup with Emacs and make. I am pretty sure that KDevelop is a great environment, but I love Emacs and the productivity I get there. Subscribe to: Post Comments (Atom). View my complete profile.

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6502-emulator.blogspot.com

Writing a 6502 emulator from scratch

Writing a 6502 emulator from scratch. Thursday, March 26, 2009. In this project i have written more macros than ever before. The main reason is the similarities between opcodes, that the way the read operands are similar. By using macros the opcode implementations can be kept down to 2-3 lines of code instead of 6-7, which makes it much easier to maintain. It is also generally faster implementing it as macros as real functions. Macros for addressing modes. Define READ BYTE IMM() read byte( PC ). Define R...

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