Groups > comp.sys.apple2.programmer > #6078

Re: Typo in ProDOS refTechMan

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From	Jerry Penner <jerry+a2@jpen.ca>
Newsgroups	comp.sys.apple2.programmer
Subject	Re: Typo in ProDOS refTechMan
Date	Tue, 22 Aug 2023 22:49:46 -0600
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Colin Leroy-Mira <colin@colino.net> writes:

> Hi everyone,
>
> I think there's a typo in the ProDOS Technical Reference Manual at
> http://www.easy68k.com/paulrsm/6502/PDOS8TRM.HTM#4.2
>
> In fact, "Upon completion of the call, the MLI returns to the address
> of the JSR plus 6" - not 3.
>
> Unless I'm mistaken.
>
> HTH,

I think you're right.  What ProDOS does is add 3 bytes to the return
address to pass over the command-number and command-list-address, but
the effect is that execution continues 6 bytes after the start of the
JSR instruction.  I have read that page many times and never noticed
that, probably because I understood what was going on with the
return-address.

Nice catch.

-- 
--
Jerry     jerry+a2 at jpen.ca

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Thread

Typo in ProDOS refTechMan Colin Leroy-Mira <colin@colino.net> - 2023-08-22 22:19 +0200
  Re: Typo in ProDOS refTechMan Jerry Penner <jerry+a2@jpen.ca> - 2023-08-22 22:49 -0600
    Re: Typo in ProDOS refTechMan Colin Leroy-Mira <colin@colino.net> - 2023-08-23 08:23 +0200
      Re: Typo in ProDOS refTechMan Oliver Schmidt <ol.sc@web.de> - 2023-08-23 07:38 +0000
        Re: Typo in ProDOS refTechMan Colin Leroy-Mira <colin@colino.net> - 2023-08-23 15:22 +0200
          Re: Typo in ProDOS refTechMan Jerry Penner <jerry+a2@jpen.ca> - 2023-08-24 00:06 -0600
            Re: Typo in ProDOS refTechMan Jeff Blakeney <CUTjeffrey_blakeney@yahoo.ca> - 2023-08-24 08:10 -0400
              Re: Typo in ProDOS refTechMan Michael J. Mahon <mjmahon@aol.com> - 2023-08-28 06:45 +0000
                Re: Typo in ProDOS refTechMan Jeff Blakeney <CUTjeffrey_blakeney@yahoo.ca> - 2023-08-28 08:28 -0400
                Re: Typo in ProDOS refTechMan Michael J. Mahon <mjmahon@aol.com> - 2023-08-31 18:54 +0000
                Re: Typo in ProDOS refTechMan Peter 'Shaggy' Haywood <phaywood@alphalink.com.au> - 2023-08-31 13:30 +1000
                Re: Typo in ProDOS refTechMan Michael J. Mahon <mjmahon@aol.com> - 2023-08-31 18:54 +0000
                Re: Typo in ProDOS refTechMan Antoine Vignau <ntn.vignau@gmail.com> - 2023-09-07 12:41 -0700
                Re: Typo in ProDOS refTechMan Peter 'Shaggy' Haywood <phaywood@alphalink.com.au> - 2023-09-05 12:14 +1000
  Re: Typo in ProDOS refTechMan qkumba <peter.ferrie@gmail.com> - 2023-08-28 10:23 -0700
    Re: Typo in ProDOS refTechMan Antoine Vignau <ntn.vignau@gmail.com> - 2023-08-28 12:29 -0700

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