Toshiba HX 34 mapper - openMSX/openMSX Wiki

7FFF = x01xxxxx

7FFF = x11xxxxx

indirect VDP register access is supported by the readback registers. 7FFF = x01xxxxx (and x10xxxxx) is not used by the firmware. So if the goal is to support the HX3x firmware in OpenMSX, the emulation of these modes could be dropped.