The "Debug Registers" view shows the current register and CPU flag values.
Values that changed during the last step are marked red.
Registers
X, Y and A show the current value of the register, hex on the left, decimal on the right side
LIN
LIN shows the current line of the raster ray
CYC
CYC shows the current cycle on the current line of the raster ray
$01
$01 shows the current value of byte $01 (CYC shows the current cycle on the current line of the raster ray
PC
PC shows the current location the processor is pointing to. Hex on the left, decimal on the right side
SP
SP shows the current stack pointer. Hex on the left, decimal on the right side
Status
Status displays the various flags of the CPU. NV-BDIZC from left to right are Negative flag, Overflow flag, Expansion Bit (unused), Break flag, Decimal flag, Interrupt flag, Zero flag and Carry flag.