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Chapter 6
Advanced BIOS Functions
The CP/M-86 operating system distributed with the APC contains a customized
BIOS, called the CBIOS, with features specific to the APC. CRT control codes, or
escape sequence functions, reside in the BIOS and are called by BDOS functions.
Extended functions also reside in the BIOS and are called directly by application
programs using program interrupt #220. The relationship among applicant pro-
grams, the BDOS, and CBIOS is shown in Figure 5-1.
CRT ESCAPE SEQUENCE FUNCTIONS
The CONOUT (Write Console Character Out) routine in the BIOS recognizes CRT
escape code sequences and performs the appropriate action in response to the codes
received. Any of the following standard functions can be used to effect the APC
console escape sequences.
• BDOS function 2 (Console Output)
• BDOS function 6 (Direct Console I/O)
• BDOS function 50 (Direct BIOS call)
Format and Definitions
Escape sequences consist of three kinds of fields: a sequence introducer that
identifies the instruction as an escape sequence, one or more parameters, and a final
character. For example, the following escape sequence moves the cursor up two
lines.
ESC[2A
The general format for the above escape sequence
ESC[PnA
presents the basic elements of all APC escape sequences.
6-1
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