It's known that you can execute at least one instruction after enabling VINT in the VDP with a pending VINT. Emulating this is required to make Sesame Street Counting Cafe to work. In an effort to understand exactly what's going on here, I've spent some time writing a test ROM and doing some measurements with a logic analyzer. In addition to answering the original question, I've got timing information for the various stages of interrupt processing and I've noticed something that is technicall...| gendev.spritesmind.net