TECMAR CAPTAIN  -  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, 0x37D, 0x27D
 
Chip port addressing: latched address
 
0x2C0 - auto scanned by clock software, selected if RTC found on this addr,  0x2C0 - address latch, 0x2C1 - data
 
0x37D - selected by default or by switch ‘-1’ ,  0x37D - address latch, 0x37F - data
 
0x27D - selected by switch ‘-2’ ,  0x27D - address latch, 0x27F - data
 
Chip: NS MM58167 (UMC UM82C8167)