19 May
2012
19 May
'12
6:23 p.m.
I've made a bit of progress on this since the last post and wanted to get
some additional help if possible. I picked up a PETvet board from
bitfixer.org and installed it. The 2001 boots now (usually) and I get a
screen like this....
http://imgur.com/fQxH3
The machine works like this, but obviously the vertical lines are a bit
annoying. The PETvet replaces the RAM and ROM, but does anyone know if
that includes replacing the video ROM? Any next steps are appreciated.
Thanks,
Win
On Mon, Apr 16, 2012 at 2:07 PM, MikeS <dm561 at torfree.net> wrote:
Yeah... thinking about it - that's what you get with the Character ROM
removed... sorry.
The thing I was trying to communicate was that the video should
certainly be uniform with the RAM removed. I just misremembered what
"empty" does.
----- Original Message:
Date: Mon, 16 Apr 2012 09:55:12 -0400
From: Ethan Dicks <ethan.dicks at gmail.com>
> Try powering up with the video RAMs removed (they are in the back and
look
like they have
dots on them). ?With no RAM, the PET should power up to a
blank screen
Tsk, tsk, Ethan, you know better than that ;-) A PET with a working video section and video RAM
removed will show the
classic checkerboard pattern or under certain circumstances a pattern of
small black squares.
Right... the character for 0xFF is the 50% checkerboard - it would
look largely the same in inverse video (unless you count from the edge
which "phase" it is).
No doubt there's considerable PET knowledge on
this list, but as Terry
suggested previously the VCF forum or one of the PET/CBM-specific lists
might be a better place to find help with a sick PET...
Perhaps. I'm not a big forum denizen (too many disconnected places to
keep up with) so I rarely see help requests posted to them.
-ethan