Posted By
SVS
on 2018-06-18
14:56:19
 |  Re: Graphic 1 or 2
The BASIC has its way to easy manage the graphic. The first time you use GRAPHIC x,y the system always allocates the graphic area from $2000 to $3FFF and shift the possible BASIC lines beyond this limit (RAM cell at $75 memorizes the status: $FF allocated, $00 no).
After this operation, all the further executions of GRAPHIC x,y do not move data area nor Basic lines (Ram cell at $75 memorizes the status: $FF allocated, $00 no)
To restore the BASIC lines back to $1000 you have to use GRAPHIC CLR (then not GRAPHIC 0!)
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