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GemdosCharacterFunctions

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GemDos Character Functions


GemDos provides a number of functions to communicate on a character basis with the default system devices. Because of irregularities with these calls in some TOS versions, usage of the BIOS functions is usually recommended instead (the BIOS does not support redirection, however).


Character functions categories


The GEMDOS character functions are illustrated in the table below:

Device Input Output Status
'con:' (1) Cconin() - Character
Cnecin() - No Echo
Cconrs() - String
Cconout() - Character
Cconws() - String
Cconis() - Input
Cconos() - Output
'prn:' None Cprnout() Cprnos()
'aux:' Cauxin() Cauxout() Cauxis() - Input
Cauxos() - Output
'con:' (2) Crawio() and Crawcin() Crawio() Cconis() - Input
Cconos() - Output

Note : In the first set of 'con:' (1) functions, character input functions do react to SystemSpecialKeys, whereas in the second set (2), character input functions ignore SystemSpecialKeys.


Character streams functions



Function Opcode Description Since
Cauxin() 3 (0x03) Waits for the next available data byte from GemDOS handle 2 (normally device 'aux:') and when available, returns it in the low byte of the returned WORD. GemDOS 0.11
Cauxis() 18 (0x12) Indicates whether GemDOS handle 2 (normally device 'aux:') has at least one character waiting. GemDOS 0.11
Cauxos() 19 (0x13) Indicated whether GemDOS handle 2 (normally device 'aux:') is ready to receive characters. GemDOS 0.11
Cauxout() 4 (0x04) Outputs a character to GemDOS handle 2, normally the 'aux:' device. GemDOS 0.11
Cconin() 1 (0x01) Reads a character (waiting until one is available) from GemDOS handle 0 (normally 'con:'). GemDOS 0.11
Cconis() 11 (0x0B) Verifies that a character is waiting to be read from GemDOS handle 0 (normally 'con:'). GemDOS 0.11
Cconos() 16 (0x10) Checks to see whether a character may be output to GemDOS handle 1 (normally 'con:'). GemDOS 0.11
Cconout() 2 (0x02) Outputs one character via GemDOS handle 1 (normally 'con:'). GemDOS 0.11
Cconrs() 10 (0x0A) Reads a string from the standard input stream (GemDOS handle 0) and echoes it to the standard output stream (GemDOS handle 1). GemDOS 0.11
Cconws() 9 (0x09) Writes a string to GemDOS handle 1 (normally 'con:'). GemDOS 0.11
Cnecin() 8 (0x08) Is the same as Cconin(), except that the character fetched from the input stream is not echoed. GemDOS 0.11
Cprnos() 17 (0x11) Returns the status of GemDOS handle 3 (normally 'prn:'). GemDOS 0.11
Cprnout() 5 (0x05) Sends one character to GemDOS handle 3 (normally 'prn:'). GemDOS 0.11
Crawcin() 7 (0x07) Is similar to Cconout(), however it does not process any special keys and does not echo the inputted character. GemDOS 0.11
Crawio() 6 (0x06) Combines console input and output in one function. GemDOS 0.11

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