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|    comp.sys.apple2    |    Discussion about Apple II micros    |    56,720 messages    |
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|    Message 55,194 of 56,720    |
|    Steve Nickolas to qkumba    |
|    Re: ProDOS boot block?    |
|    29 Dec 21 13:27:59    |
      From: usotsuki@buric.co              On Wed, 29 Dec 2021, qkumba wrote:              >> 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.       >              Didn't know you could use a segment override with JMP. o.o              The 8086 is a lot more complicated than the 6502.              (I'm also trying to write a 6502 core in 8086 asm but given that I don't       even have a fully working 6502 core in C, it's probably a fool's errand.)              -uso.              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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