$00-$05 - ??? $06-$09 - Free Space $0A-$0C - JMP to USR() User Function Routine $0D-$17 - ??? $18 - First Data Track $19 - First Data Sector $1A-$1B - Shape Pointer for DRAW $1C - Last COLOR Used $1D-$1E - Free Space $1F - ??? $20 - Left Margin (0 - 39/79, 0 is default) $21 - Width (1 - 40/80, 40 is default, 0 crashes Applesoft) $22 - Top Margin (0 - 23, 0 is default, 20 in graphics mode) $23 - Bottom Margin (0 - 23, 23 is default) $24 - Horizontal Cursor Position (0 - 39/79) $25 - Vertical Cursor Position (0 - 23) $26-$27 - Address of Byte Containing X,Y $28-$29 - Base Address of Text Cursor's Position $2A - ??? $2B - Boot Slot * 16 $2C - Lo-Res HLIN/VLIN Endpoint $2D-$2F - ??? $30 - COLOR Value * 17 $31 - ??? $32 - Text Mask ($FF = Normal, $7F = Inverse, $3F = Flashing) $33 - Prompt Character $34-$35 - ??? $36-$37 - Address of Output Routine $38-$39 - Address of Input Routine $3A-$4F - ??? $50-$51 - Result of the Conversion of the FAC to a 16-Bit Integer $52-$66 - ??? $67-$68 - Address of Beginning of BASIC Program ($0801 is default) $69-$6A - Address of Beginning of BASIC Variables $6B-$6C - Address of Beginning of BASIC Arrays $6D-$6E - Address of End of BASIC Variables $6F-$70 - Address of End of String Data $71-$72 - Address to Move String To $73-$74 - Address of Beginning of String Data $75-$76 - Current Line Number Being Executed $77-$78 - Line Number Where END or STOP or BREAK Occurred $79-$7A - Address of Line Number Being Executed $7B-$7C - Current Address of DATA $7D-$7E - Next Address of DATA $7F-$80 - Address of Input or Data $81-$82 - Last Used Variable's Name $83-$84 - Last Used Variable's Address $85-$9A - ??? $9B-$9C - Pointer for $D61A and $F7D9 $9D-$A3 - Floating Point Accumulator (FAC) $A4 - ??? $A5-$AB - Floating Point Argument Register (ARG) $AC-$AE - ??? $AF-$B0 - Address of End of BASIC Program $B1-$B6 - Subroutine to Increase the String Data Pointer $B7-$BE - Subroutine to Return the Character Pointed to by the String Data Pointer $BF-$CD - ??? $CE-$CF - Free Space $D0-$D3 - ??? $D4 - Error Code Flag $D5-$D6 - ??? $D7 - Free Space $D8 - Error Flag (Bit 7 Set if an Error Handler is Used) $D9 - ??? $DA-$DB - Line Number Where Error Occurred $DC-$DD - ??? $DE - Error Code $DF - ??? $E0-$E1 - Horizontal Coordinate of HPLOT $E2 - Vertical Coordinate of HPLOT $E3 - Free Space $E4 - HCOLOR Value (0=0, 1=42, 2=85, 3=127, 4=128, 5=170, 6=213, 7=255) $E5 - ??? $E6 - High Byte of Address of First Byte of Where HGR is Plotted $E7 - SCALE Value (0 = 256) $E8-$E9 - Address of Shape Table $EA - DRAW/XDRAW Collision Count $EB-$EF - Free Space $F0 - ??? $F1 - SPEED Value (Subtracted From 256) $F2 - ??? $F3 - Text OR Mask for Flashing Text $F4-$F5 - Address of Error Handler (Line Number after ONERR GOTO) $F6-$F8 - ??? $F9 - ROT Value $FA-$FE - Free Space $FF - Used by Applesoft's STR$ Function
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