LZ: ROM Calls

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LZ: ROM Calls

-> I'm working on disassembling the ROM code and hopefully finding some
-> neat things.  Does anyone know of the addresses of any ROM calls in
-> ROM 10.0?


These are some I figures out today.


----------------------


Some ROM routines have really no use (Mainly since they modify variables
in memory that I have no idea what they are), but I include them so that
if anyone else finds out what the memory is they can figure out what the
procedure is for.


================== RAM =====================
Table 0x7976: ??
Byte 81fe: ??
================== ROM 10.0 ================


  -- 0x00ac --Decremets Busy Counter: if zero update BUSY and reset counter--
  Input:
    none
  Output:
    HL - 0xfc8f
    DE - 0x0010
    B  - 0x00
    A  - Current BUSY bitmap


  -- 0x015d --Multiple keys pressed--
  Input:
    none
  Output:
    KEY_2    - 0xFF
    KEY_STAT - 0x05
    A        - 0x05


  -- 0x419e --Adds A to HL--
  Input:
    A
    HL
  Output:
    HL - HL+A
    D  - 0x00
    E  - A


  -- 0x4246 --Sets Mem:(0x81d1) to 0x5a9d
  Input:
    None
  Output:
    Mem:(0x81d1):Word - 0x5a9d
  ( What is the word at 0x81d1 for? )


  -- 0x4918 --Sets Mem:(0x81fe)=0 Mem:(0x81fc)=0x81f0
  Input:
    None
  Output:
    A  - 0x00
    DE - 0x81f0
    Mem(0x81fe):Byte - 0x00
    Mem(0x81fc):Word - 0x81f0


  -- 0x6e52 --Returns value in table at 0x7976 with index in A--
  uses Procedure at 0x71af
  Input:
    A  - Index
  Output:
    A  - Mem:(A*7+0x7976):Byte - Table entry at Index


  -- 0x6e5b --Compares Cursor Row with Mem:(0x8b30)--
  Input:
    None
  Output:
    A - Cursor Row
    Zero Flag


  -- 0x71af --Calculates Address into table at 0x7976 with index in A--
  Input:
    A  - Index
  Output:
    DE - 0x7976
    HL - A*7+0x7976


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