[Coco] Bug in VCC ???

[Bill Pierce]

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
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-----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.com properly.

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.


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