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36 lines
1.6 KiB
C
36 lines
1.6 KiB
C
/***************************************************************************
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* TTYINRAW.C - handles raw input independent of (CP/M) OS.
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* Problem is that different OSs handle Raw Input in different ways.
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* CPM-86 and CPM68K use only 0xFF, but CPM68K waits for a character.
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* Hard loops in multi-tasking, however, waste CPU cycles, so MPM and
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* Concurrent use 0xFD.
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*
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* Edits:
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* 26-Jan-84 whf simplify for 68k compiler.
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* 8-Dec-83 whf handle PC-DOS like CPM-86
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****************************************************************************/
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#include "portab.h"
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#include "osif.h"
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#include "osiferr.h"
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/****************************/
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MLOCAL WORD CharInReq = 0xFF; /* Default CONIO Char In Rqs*/
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/****************************/
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WORD _ttyinraw() /* */
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{ /****************************/
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REG WORD ic; /* Input Char */
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/* */
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while((ic=__OSIF(CONIO,CharInReq))==0) /* Wait in loop if needed */
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{ /* */
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#if CPM /*================================================================*/
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/* This goes inside the loop; for Concurrent, it will be called */
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/* only once, while for other O.S.'s, it doesn't matter what we */
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/* do while we're waiting for a char. */
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__OSIF(S_BDOSVER,0); /* Puts AX in __cpmrv */
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if( __cpmrv & 0x0500 ) /* Concurrent or MPM */
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CharInReq = 0xFD; /* Change Char Input Parm */
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#endif /*================================================================*/
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} /* */
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return ic; /* */
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} /****************************/
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