User`s guide

BDOS FUNCTION 6: DIRECT CONSOLE I/0

Entry Parameters:

Registers C: 06H

E: 0FFH (input/status) or

0FEH (status) or

0FDH (input) or

char (output)

Returned Value:

CP/M 3 supports direct I/O to the logical console, CONIN:, for those specialized

applications where unadorned console input and output is required. Use Direct Con-

sole I/O carefully because it bypasses all the normal control character functions.

Programs that perform direct I/O through the BIOS under previous releases of CP/M

should be changed to use direct I/O so that they can be fully supported under future

releases of MP/M and CP/M.

A program calls Function 6 by passing one of four different values in register E.

The values and their meanings are summarized in Table 3-1.

3-7

BDOS Function Calls CP/M 3 Programmers Guide