MPU-4

INC – Increment

LDA - Load accumulator

LSR - Logical shift right

NEA - Negate

ORA - Inclusive OR

PSH - Push data onto stack

PUL - Pull data from stack

ROL - Rotate left

ROR - Rotate right

RTI - Return from interrupt

SBA - Subtract accumulators

SBC - Subtract with carry

STA - Store accumulator

SUB - Subtract

SWI - Software interrupt

TAB - Transfer from accumulator A to accumulator B

TAP - Transfer from accumulator A to processor condition codes register

TBA - Transfer from accumulator B to accumulator A

TPA - Transfer from processor condition codes register to accumulator A

TST - Test

WAI - Wait for interrupt

Index Register

The index register (X) is a 16 bit (2 byte) register which is primarily used to store a memory address in the Indexed mode of memory addressing. The index register may be decremented, incremented and stored. Instructions which involve the index register are: