Topic       : The GFA-Basic Compendium
Author      : GFA Systemtechnik GmbH
Version     : GFABasic.HYP v2.98 (12/31/2023)
Subject     : Documentation/Programming
Nodes       : 899
Index Size  : 28056
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
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@hostname   : STRNGSRV
@hostname   : CAB     
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@hostname   : THING   
View Ref-FileThese functions give the addresses in the VDI Parameter Block, which are the
addresses of the first bytes of the CONTRL, INTIN etc. arrays. The arrays can
be accessed by placing an index value in brackets after the array name, for
example CONTRL(2)=x& corresponds to DPOKE CONTRL+4,x& and x&=CONTRL(2) to
x&=DPEEK(CONTRL+4). The other arrays are also organised in word format.

The meanings are:

    CONTRL  -->  Address of the VDI control table
    INTIN   -->  Address of the VDI integer input table
    PTSIN   -->  Address of the VDI point coordinate input table
    INTOUT  -->  Address of the VDI integer output table
    PTSOUT  -->  Address of the VDI point coordinate output table

These tables (2-byte word arrays) contain the parameters for VDI calls.

Memo: These built in tables have the following limits:
      CONTRL(0-11)
      INTIN(0-127)
      PTSIN(0-31)   <- Bug in the editor, should be 0-255
      INTOUT(0-127)
      PTSOUT(0-255)

      This appears to be a 'worst case senerio', as newer VDI versions allow
      larger table sizes. If you exceed these values in a compiled program
      there is no error message, instead some memory location gets changed
      unexpectedly.