Initialize Keyboard Fifo Buffer; Direct Crt 1/0 - NEC CP/M-86 System Reference Manual

Advanced BIOS Functions
6-18
Initialize Keyboard FIFO Buffer
ENTRY RETURN
CL: 06H EXT FUNC 6
INIT KB
FIFO BUFFER
The Initialize Keyboard FIFO Buffer function initializes the KB FIFO buffer. This
function does not pass any parameters.
Direct CRT
va
ENTRY
CL: 07H
DS:DX: Display
Request Block
Address
RETURN
II
EXT FUNC 7
DIRECT CRT I/O
The extended BIOS routines allow the assembly language programmer to perform
high speed block level I/O operations to the console through the DMA. Five
different operations may be performed through this function. They are identified by
the command number passed in the display request block. The extended function
commands are listed in Table 6-8 and described in detail in this section.
Table 6-8 Direct CRT
va
Function Calls
CMD# FUNCTION
0 Display video memory format data on CRT
1 Display string data on CRT
2 Report cursor position by binary value
3
Roll down screen
4 Roll up screen