IBM PC CONVERTIBLE

Contents
Section 1. Power-On Self-Test (POST) ............... 1-1
Power-On Self-Test Sequence .................. 1-2
Modem Presence Test ........................ 1-9
Printer/Communications Presence Test ......... 1-12
Section 2.
ROM BIOS Listing ...................... 2-1
ROMMap ................................. 2-4
Common Equates and Data Areas ............... 2-7
Nonmaskable Interrupt Handler (BlONMIH)
.... 2-26
Keyboard Services
(BIIKYBD) ............... 2-65
Video I/O and Print Screen (BI2VIDEO) ........ 2-77
Diskette Support
(B 13DSKT) ................ 2-119
Communications
and Printer BIOS
(B14COMMO)
........................... 2-143
Time
of Day (B15TOD) ..................... 2-153
System Services
(B 16SYSV) . . . . . . . . . . . . . . . . . . 2-168
General Subroutines
and Tables (B 17T ABLE) ... 2-191
Release Date Marker ....................... 2-241
System Model Byte
......................... 2-241
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