[Coco] Bug in VCC ???

[Luis Antoniosi (CoCoDemus)]

I found VCC does Half-Carry different from 6809.

doing this:

ldd #$0fc9
addb #$40
adca #$00

it will set the HC on VCC but not on 6809.





On Wed, Apr 16, 2014 at 1:34 PM, Bill Pierce <ooogalapasooo at aol.com> wrote:

>
> I jut tried it on my Coco 3. It seems to be running fine. A little slow
> (expected), but running.
> I agree it's most likely a VCC bug. I've had a few strange things happen
> in VCC in certain programs but I can never pin them down to what's causing
> them. Usually, it's in direct GIME access, but this seems to be, as you
> said, something not being set right in the registers. I've never run into
> this before as all "register" manipulation I've done in C and ASM has
> always worked.
>
> BTW... Now you got me playing Zork 1 :-P
>
>
> Bill Pierce
> "Today is a good day... I woke up" - Ritchie Havens
>
>
> My Music from the Tandy/Radio Shack Color Computer 2 & 3
> https://sites.google.com/site/dabarnstudio/
> Co-Webmaster of The TRS-80 Color Computer Archive
> http://www.colorcomputerarchive.com/
> Co-Contributor, Co-Editor for CocoPedia
> http://www.cocopedia.com/wiki/index.php/Main_Page
> E-Mail: ooogalapasooo at aol.com
>
>
>
>
> -----Original Message-----
> From: Luis Antoniosi (CoCoDemus) <retrocanada76 at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Wed, Apr 16, 2014 12:44 pm
> Subject: Re: [Coco] Bug in VCC ???
>
>
> That's the bug. Try it on MESS or any real coco.
>
>
> On Wed, Apr 16, 2014 at 12:42 PM, Bill Pierce <ooogalapasooo at aol.com>
> wrote:
>
> >
> > Luis, I tried it i VCC 1.4.3beta and I get the CPM logo, then it seems to
> > scroll one line at a time but no text displays for at least a screen of
> > lines, then ending in a:
> > --------------------- More --------------------
> > prompt. Hitting any key makes it scroll more, same results.
> >
> > I tried it again in VCC 1.4.3beta+FSTEST1 (Aaron's latest patch) and it
> > did the same thing. The same also happens in Vcc 1.4.2
> >
> >
> > Bill Pierce
> > "Today is a good day... I woke up" - Ritchie Havens
> >
> >
> > My Music from the Tandy/Radio Shack Color Computer 2 & 3
> > https://sites.google.com/site/dabarnstudio/
> > Co-Webmaster of The TRS-80 Color Computer Archive
> > http://www.colorcomputerarchive.com/
> > Co-Contributor, Co-Editor for CocoPedia
> > http://www.cocopedia.com/wiki/index.php/Main_Page
> > E-Mail: ooogalapasooo at aol.com
> >
> >
> >
> >
> > -----Original Message-----
> > From: Luis Antoniosi (CoCoDemus) <retrocanada76 at gmail.com>
> > To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> > Sent: Wed, Apr 16, 2014 12:16 pm
> > Subject: [Coco] Bug in VCC ???
> >
> >
> > I noticed the VCC 1.43beta won't run my cpm emulator running
> zork1.comproperly.
> >
> > It seem to get a wrong conditional jump and goes crazy scrolling the
> > screen up.
> >
> > The same image DOES work on MESS and a real Coco3. The Mbasic.com
> > seemed at beginning to work fine.
> >
> > I'm using a direct lookup table to convert 6809 flags to Z-80 flags.
> > So it could be the case some instruction setting or resetting a wrong
> > flag.
> >
> > I have no clue which instruction is that since I don't use VCC (it
> > does not have a debugger it has no purpose for me).
> >
> > The cpm disks:
> >
> >
> >
> https://sites.google.com/site/tandycocoloco/dropbox/cpm-os9.zip?attredirects=0&d=1
> >
> > Mount zork.os9 (80T disk image) and run
> >
> > /d1/cpm zork1.com
> >
> > And you will see the bug right away.
> >
> >
> > --
> > Long live the CoCo
> >
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> >
> >
> >
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> >
>
>
>
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