7 Sep
2016
7 Sep
'16
12:04 p.m.
Charles Dickman's site shows a VC8E screenshot with text:
http://www.chdickman.com/pdp8/spacewar/
However, unless I'm missing something, I don't actually see what would've
drawn the characters. A little digging on Bitsavers shows there was a VC8E
driver.
http://bitsavers.trailing-edge.com/bits/DEC/pdp8/papertapeImages/russ.ucs.i…
Even in this, I don't see any sign of a character lookup table or the like.
Where would all of this have been created?
Thanks,
Kyle
7 Sep
7 Sep
12:56 p.m.
On Wed, Sep 7, 2016 at 9:04 AM, Kyle Owen <kylevowen at gmail.com> wrote:
Charles Dickman's site shows a VC8E screenshot
with text:
http://www.chdickman.com/pdp8/spacewar/
However, unless I'm missing something, I don't actually see what would've
drawn the characters. A little digging on Bitsavers shows there was a VC8E
driver.
http://bitsavers.trailing-edge.com/bits/DEC/pdp8/papertapeImages/russ.ucs.
indiana.edu/Utils/VC8E/Ascii/havc8e.pa
Even in this, I don't see any sign of a character lookup table or the like.
Where would all of this have been created?
I have a vague memory of a FOCAL overlay for VC8/E that had a character
table in it, but I can't find it on the webs at the moment.
-- Charles
5:20 p.m.
From: Kyle Owen: Wednesday, September 07, 2016 9:04 AM
However, unless I'm missing something, I don't
actually see what would've
drawn the characters. A little digging on Bitsavers shows there was a VC8E
driver.
http://bitsavers.trailing-edge.com/bits/DEC/pdp8/papertapeImages/russ.ucs.i…
Even in this, I don't see any sign of a character lookup table or the like.
Where would all of this have been created?
That driver contains the line:
JMS I (STRTHL+4 /CALL PROGRAM HELP
which calls the code in
http://bitsavers.trailing-edge.com/bits/DEC/pdp8/papertapeImages/russ.ucs.i…
which is what I think you were looking for.
Vince
5:34 p.m.
On Wed, Sep 7, 2016 at 4:20 PM, Vincent Slyngstad <v.slyngstad at frontier.com>
wrote:
That driver contains the line:
JMS I (STRTHL+4 /CALL PROGRAM HELP
which calls the code in
http://bitsavers.trailing-edge.com/bits/DEC/pdp8/papertapeIm
ages/russ.ucs.indiana.edu/Utils/VC8E/Ascii/help.pa
which is what I think you were looking for.
Thanks Vince! Yes, that's definitely it. I've been staring at the somewhat
related Tektronix 4013 terminal emulator too, in a couple of parent
directories above. I need to do some more investigating to figure out how
the driver actually works, but it looks like both programs are very
dependent on the store mode of the oscilloscope. Based on what I see, there
is no massive buffer that the driver iterates through to keep things
refreshed, but I might be missing it.
Now I'm working on real VC8E integration into SimH to better tell how these
programs work. Anyone want to help? :)
Kyle
4:14 p.m.
On Thu, Sep 8, 2016 at 11:59 PM, Pontus Pihlgren <pontus at update.uu.se>
wrote:
Hmm, yes, I think I might actually. What do you have so far?
I don't have much yet, unfortunately; still trying to get my thoughts
together on how it should be implemented. Mark Pizzolato recommends using
as much existing display code as possible. I did start an issue for it
here, though: https://github.com/simh/simh/issues/337
Kyle
10 Sep
10 Sep
6:25 a.m.
On Fri, Sep 09, 2016 at 03:14:41PM -0500, Kyle Owen wrote:
On Thu, Sep 8, 2016 at 11:59 PM, Pontus Pihlgren
<pontus at update.uu.se>
wrote:
I found Phils code when I looked into this yesterday. There also the VR12
emulation in the, now dormant, GreenPea[1] project. I was wondering which
graphics library to use but since both simh and GreenPea uses SDL I guess
that settle that.
I found and read Dougs[2] VC8E summary. Do you have any other docs? A
cursory look on bitsavers didn't give any result.
/P
[1] https://github.com/andysan/greenpea/
[2] http://homepage.cs.uiowa.edu/~jones/pdp8/man/vc8e.html
Hmm, yes, I think I might actually. What do you have so far?
I don't have much yet, unfortunately; still trying to get my thoughts
together on how it should be implemented. Mark Pizzolato recommends using
as much existing display code as possible. I did start an issue for it
here, though: https://github.com/simh/simh/issues/337
Kyle
2944
days inactive
2947
days old
6 comments
4 participants
participants (4)
-
charles.unix.pro＠gmail.com -
kylevowen＠gmail.com -
pontus＠Update.UU.SE -
v.slyngstad＠frontier.com