HYPERTEC HYPER-PORT -  I/O PORT USAGE OF CLOCK.SYS SOFTWARE
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MAY 2015
 
The following information was provided by Maelgrum of the Vintage Computer Forums.
The information can help identify I/O port conflicts.
 

Base Ports: 0x278, 0x378 (yes, its LPT3 and LPT2 base ports !)
Chip port addressing: latched (base+1 - addr, base+3 - data)