System information

FUNCTION 5: LIST OUTPUT

Entry Parameters:

The List Output function sends the ASCII character in register E to the logical listing device.

FUNCTION 6: DIRECT CONSOLE 1/0

Entry Parameters:

char(output)

Returned Value: char or status Register A:

Direct Console I/O is supported under CP/M for those specialized applications where basic

console input and output are required. Use of this function should, in general, be avoided since it

bypasses all of the CP/M normal control character functions (for example, CTRL-S and

CTRL-P). Programs that perform direct I/O through the BIOS under previous releases of CP/M,

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

under future releases of MP/M and CP/M.

Upon entry to Function 6, register E either contains hexadecimal FF, denoting a console input

request, or an ASCII character. If the input value is FF, Function 6 returns A = 00 if no character

is ready, otherwise A contains the next console input character.

If the input value in E is not FF, Function 6 assumes that E contains a valid ASCII character that

is sent to the console.

Function 6 must not be used in conjunction with other console I/O functions.

5.2 Call Conventions CP/M Operating System Manual

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