By request, I designed some adapter boards that replace 42-pin Toshiba ROMs with a 3.3V flash chip (W29GL064CB7S or compatible). These boards include a 3.3V regulator and 3.3V level translators, as 5V flash chips of this size are unobtanium. The design is here, if you would like to make your own: https://github.com/tdaede/toshiba-64mbit-adapter
These are not in circuit programmable, you will need to program the flash before soldering it on.
These are not in circuit programmable, you will need to program the flash before soldering it on.