#6502_assembly — Public Fediverse posts

I came up with some 6502 assembly tricks:
- make N and Z flags reflect A (no side effects): AND #$FF (used in Excitebike; alternatives: ORA #0 or EOR #0)
- make N and Z flags reflect X (no side effects*): INX & DEX (or for Y: INY & DEY)

*If your interrupt routines don't access the value of X besides preserving it.

#6502assembly #6502_assembly

Apple: Our philosophy is to provide software for our machines free (1976)
http://apple1.chez.com/Apple1project/Gallery/Gallery.htm
#ycombinator #Apple #Apple1 #Apple_1 #6502 #NMOS6502 #Microprocessor #Pom #Pom1 #Opcode_Matrix #Wozniak #monitor #bios #rom #computer #Ordinateur #Opcode #Instruction #Java #Applets #6502_Assembly #Emulation #Archive #Emulator #Histoire #History #Documentation #Doc #Docs

Apple: Our philosophy is to provide software for our machines free (1976)
http://apple1.chez.com/Apple1project/Gallery/Gallery.htm
#ycombinator #Apple #Apple1 #Apple_1 #6502 #NMOS6502 #Microprocessor #Pom #Pom1 #Opcode_Matrix #Wozniak #monitor #bios #rom #computer #Ordinateur #Opcode #Instruction #Java #Applets #6502_Assembly #Emulation #Archive #Emulator #Histoire #History #Documentation #Doc #Docs

Apple: Our philosophy is to provide software for our machines free (1976)
http://apple1.chez.com/Apple1project/Gallery/Gallery.htm
#ycombinator #Apple #Apple1 #Apple_1 #6502 #NMOS6502 #Microprocessor #Pom #Pom1 #Opcode_Matrix #Wozniak #monitor #bios #rom #computer #Ordinateur #Opcode #Instruction #Java #Applets #6502_Assembly #Emulation #Archive #Emulator #Histoire #History #Documentation #Doc #Docs

Apple: Our philosophy is to provide software for our machines free (1976)
http://apple1.chez.com/Apple1project/Gallery/Gallery.htm
#ycombinator #Apple #Apple1 #Apple_1 #6502 #NMOS6502 #Microprocessor #Pom #Pom1 #Opcode_Matrix #Wozniak #monitor #bios #rom #computer #Ordinateur #Opcode #Instruction #Java #Applets #6502_Assembly #Emulation #Archive #Emulator #Histoire #History #Documentation #Doc #Docs

How inaccurate are Nintendo's official emulators? [video]
https://www.youtube.com/watch?v=oYjYmSniQyM
#ycombinator #Gaming #Speedrunning #TAS #Tool_Assisted_Speedrun #Emulation #Nintendo_Entertainment_System #NES_Emulation #NesDev #6502_Assembly #Programming #Accuracy_Testing #Emulators