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   comp.sys.apple2      Discussion about Apple II micros      56,720 messages   

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   Message 55,193 of 56,720   
   qkumba to All   
   Re: ProDOS boot block?   
   29 Dec 21 10:11:51   
   
   From: peter.ferrie@gmail.com   
      
   > 0100- B8 01 02 MOV AX, 0201   
   > 0103- 41 INC CX   
   > 0104- 9C PUSHF   
   > 0105- 06 PUSH ES   
   > 0106- 53 PUSH BX   
   > 0107- EA 4C 00 00 00 JMP 0000:004C   
   >   
   > 12 bytes, eh? That's far more efficient than I'd come up with. xD   
      
   The instruction at 0107 should read   
      
   0107- 26 FF 26 4C 00 JMP FAR ES:[004C]   
      
   It has to be indirect to use the vector.   
   If you're willing to bet that DS is also zero, then you can drop the first 26.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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