SDLSTL, SDLSTH Shadow register of pointer to display list

DLISTL, DLISTH Pointer to display list

SDMCTL Direct Memory Access (DMA) Control

VDSLST Pointer to Display List Interrupt routine

NMIEN to enable the Display List Interrupt

NMIST, NMIRES to check the status of NMIEN

WSYNC halts the CPU until end of scanline

VCOUNT Scanline counter

PENH, PENV horizontal and vertical position of the light pen

LPENH, LPENV shadow register of PENH and PENV

Display List Instruction table


see topic list, VBI Vertical Blank Interrupt