IBM PC CONVERTIBLE Technical Reference page 24

From
Part 5
Set RS232_BASE
table entry to hex
2F8.
Move
RS232_BASE
table pointer to
next entry.
Set equipment
word for number
of printer and
communications
ports installed.
No
Figure 1-3 (Part 6 of 7). Printer/Communications Presence Test
Power-On Self-Test (POST) 1-17