(???) 06-$09 - Free Space (Address of Main Menu Routine for Jon Relay's Desktop)
 (???) 0A-$0C - JMP to USR() User Function Routine
 (???) 18     - First Data Track
 (???) 19     - First Data Sector
 (???) 1A-$1B - Shape Pointer for DRAW (???)
 (???) 1C     - Last COLOR Used
 (???) 1D-$1E - Free Space
 (???) 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, 19 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-$29 - Base Address of Text Cursor's Position
 (???) 2B     - Boot Slot * 16
 (???) 2C     - Lo-Res HLIN/VLIN Endpoint
 (???) 30     - COLOR Value * 17
 (???) 32     - Text Mask ($FF = Normal, $7F = Inverse, $3F = Flashing)
 (???) 33     - Prompt Character
 (???) 36-$37 - Address of Output Routine
 (???) 38-$39 - Address of Input Routine
 (???) 50-$51 - Result of the Conversion of the FAC to a 16-Bit Integer
 (???) 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
 (???) 9B-$9C - Pointer for $D61A and $F7D9 (???)
 (???) 9D-$A3 - Floating Point Accumulator (FAC)
 (???) A5-$AB - Floating Point Argument Register (ARG)
 (???) AF-$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
 (???) ointer
 (???) CE-$CF - Free Space
 (???) D4     - Error Code Flag (???)
 (???) D7     - Free Space
 (???) D8     - Error Flag (???)
 (???) DA-$DB - Line Number Where Error Occurred
 (???) DE     - Error Code
 (???) E0-$E1 - Horizontal Coordinate of HPLOT
 (???) E2     - Vertical Coordinate of HPLOT
 (???) E3     - Free Space
 (???) E4     - HCOLOR Value (0=0, 1=42, 2=85, 3=127, 4=128, 5=170, 6=213, 7=255)
 (???) E6     - High Byte of Address of First Byte of Where HGR is Plotted
 (???) E7     - SCALE Value (0 = 256)
 (???) E8-$E9 - Address of Shape Table
 (???) EA     - DRAW/XDRAW Collision Count
 (???) EB-$EF - Free Space
 (???) F1     - SPEED Value (Subtracted From 256)
 (???) F9     - ROT Value
 (???) FA-$FE - Free Space
 (???) FF     - Free Space (Flag Bits for Jon Relay's Desktop)
 (???) - 
 (???) \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
 (???) onrelay@napanet.net                        dimension18.cjb.net
 (???) n Apple II fanatic since 1998!     S0.5 LIS+++! Suzy+++! M1987
 (???)  Macintosh fanatic since 1996?       OM0.1 OZY++ MIL+++! M1987
 (???) n Ozy & Millie fanatic since 2000. MC1.0 CHL+++! TAM+++! M1987
 (???) Remember, if it's not a secure web server, it's an _insecure_
 (???) eb server!"                                              -- Me
 (???) *_     Syntax Error: an error on a criminal's tax record.
 (???)   |    Bad Subscript: a criminal reading a book on a subway.
 (???)  ---   Unimplemented Trap: when a bear trap isn't set up 
 (???) |' ,|  properly and thus does not work.
 (???)  ---   Overflow: too many ice cubes.      <Can't Restart>
 (???)          Don't forget: Tammy Day on February 15th!
 (???) lease remove capital letters from my e-mail address to respond.
 (???) on Bettencourt wrote:
 (???)  
 (???)  $FF     - Free Space (Flag Bits for Jon Relay's Desktop)
 (???) ust a quickie: $FF is not free; it is used by Applesoft's STR$ routine.
 (???) - 
 (???) roetjes, Pim
 (TN3) o send me e-mail, insert a t right before the dot.
 (???) hich reminds me, I'd better get on with... IT!
 (???) ere are some more adjustments or clarifications to the zero page
 (???) emory usage table...
 (???) 22     - Top Margin (0 - 23, 0 is default, 20 in graphics mode)
 (???) D8     - Error Flag (>=128 if error handler active)
 (???) F3     - Text OR mask (for flashing text)
 (???) F4-$F5 - address of error handler (points to line number after ONERR GOTO...)
 (???) - 
 (???) roetjes, Pim
 (TN3) o send me e-mail, insert a t right before the dot.
 (???) hich reminds me, I'd better get on with... IT!