VTECH LASER XT  -  I/O PORT USAGE OF RTC SOFTWARE
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APRIL 2015
 
The following information was provided by Maelgrum of the Vintage Computer Forums.
The information can help identify I/O port conflicts.
 
 
Base Ports: 0x2C0,0x340 (auto scanned by clock software)
 
Chip port addressing: direct, 16 ports (0x2C0..0x2CF or 0x340..0x34F)
 
Chips: Ricoh RP5C01, OKI MSM6242B (2 different types supported)