OK, I have no idea if I'm doing this right.

I'm trying to get the value of IO port 02h and put it into AX. So far this is what I have, based on some other code on #EDisAsm that @M0CUV wrote. My gut says that it's not right.

For full context, this is for an ASIC9-based #Psion machine (NEC V30H or V30MX, so 8086 plus a few extra opcodes). Port 02h has some info about these machines that the emulator dev needs to get info on memory mapping/addressing/mirroring.

#RetroComputing #x86asm #retrodev

I'm hoping this little bit of code that I'm going to throw into #EDisAsm is going to give me the value of IO port 0x02 on an ASIC9-based Psion. #TASM 4.1 doesn't hate it, so I just need to try running it on a real machine. But that's a tomorrow problem.

#RetroComputing #Psion #Series3a #Series3c #Series3mx #NECV30 #16bit #x86asm #assembly #oldtech #RetroDev #borland

ORG.ASM

;
; Assembly Language Love Poem
; For A Geek Goddess
;
mov al,n
out dx,al
mov ah,al
and al,0x0f
out dx,al
shr ah,1
shr ah,1
shr ah,1
pop

#SmallPoems #Poetry #PoetryCorner #PoultryCoroner 🐔🐓🦃🦆 #x86ASM #Assembler #ComputerScience #Coding #NestedInterruptHandler

X86 Opcode and Instruction Reference

Really good reference!

#x86 #opcode #asm #assembler #instruction #reference #intel #x86asm

http://ref.x86asm.net/