How to learn assembely?

[T.Jackson]

FYI, in PBP Select Case will be a little less code efficient (talking about code size) than multiple IF-THEN-ELSE... as with ALL other language anyway. Select Case is just easier to read, modify, implement. Save your finger nails...

Try making a Nintendo Emulator in VB using IF's as opposed to Select Case. There's about a %25 difference in speed.

   Select Case instruction(opcode)
          Case INS_JMP: ' jmp6502
               adrmode opcode
               PC = savepc
           Case INS_LDA: ' lda6502
               adrmode opcode
               a = Read6502(savepc)
               SetFlags a
           Case INS_LDX:
               adrmode (opcode)
               x = Read6502(savepc)
               SetFlags x
           Case INS_LDY
               adrmode (opcode)
               y = Read6502(savepc)
               SetFlags y
           Case INS_BNE: bne6502
           Case INS_CMP: cmp6502
           Case INS_STA
               adrmode (opcode)
               Write6502 savepc, a
           Case INS_BIT: bit6502
           Case INS_BVC: bvc6502
           Case INS_BEQ: beq6502
           Case INS_INY: iny6502
           Case INS_BPL: bpl6502
           Case INS_DEX: dex6502
           Case INS_INC: inc6502
           Case INS_DEC: dec6502
           Case INS_JSR: jsr6502
           Case INS_AND: and6502
           Case INS_NOP:
    
           Case INS_BRK: brk6502
           Case INS_ADC: adc6502
           Case INS_EOR: eor6502
           Case INS_ASL: asl6502
           Case INS_ASLA: asla6502
           Case INS_BCC: bcc6502
           Case INS_BCS: bcs6502
           Case INS_BMI: bmi6502
           Case INS_BVS: bvs6502
           Case INS_CLC: p = p And &HFE
           Case INS_CLD: p = p And &HF7
           Case INS_CLI: p = p And &HFB
           Case INS_CLV: p = p And &HBF
           Case INS_CPX: cpx6502
           Case INS_CPY: cpy6502
           Case INS_DEA: dea6502
           Case INS_DEY: dey6502
           Case INS_INA: ina6502
           Case INS_INX: inx6502
           Case INS_LSR: lsr6502
           Case INS_LSRA: lsra6502
           Case INS_ORA
                adrmode opcode
                a = a Or Read6502(savepc)
                SetFlags a
    
           Case INS_PHA: pha6502
           Case INS_PHX: phx6502
           Case INS_PHP: php6502
           Case INS_PHY: phy6502
           Case INS_PLA: pla6502
           Case INS_PLP: plp6502
           Case INS_PLX: plx6502
           Case INS_PLY: ply6502
           Case INS_ROL: rol6502
           Case INS_ROLA: rola6502
           Case INS_ROR: ror6502
           Case INS_RORA: rora6502
           Case INS_RTI: rti6502
           Case INS_RTS: rts6502
           Case INS_SBC: sbc6502
           Case INS_SEC: p = p Or &H1
           Case INS_SED: p = p Or &H8
           Case INS_SEI: p = p Or &H4
           Case INS_STX
                adrmode (opcode)
                Write6502 savepc, x
           
           Case INS_STY
                adrmode (opcode)
                Write6502 savepc, y
           Case INS_TAX: tax6502
           Case INS_TAY: tay6502
           Case INS_TXA: txa6502
           Case INS_TYA: tya6502
           Case INS_TXS: txs6502
           Case INS_TSX: tsx6502
           Case INS_BRA: bra6502
      End Select

(This procedure is not my code, but I wish it was)