Why do most 64 games use port 2?
Christopher Prest
that most 64 games want you to pop the joystick in port 2.
Why would they not have used port 1?
Chris
wats...@ten.tsacmoc
Port 1 and the keyboard are both connected to the same lines on one of the
CIA chips, so pressing certain keys on the keyboard interferes with
joystick operation.
White Flame (aka David Holz)
news:br752s$aok$1...@freenet9.carleton.ca...
> Maybe there is a simple explanation, but I always found it odd
> that most 64 games want you to pop the joystick in port 2.
>
> Why would they not have used port 1?
The CIA chip that controls the joystick ports also double as the keyboard
scanner. The way it's wired up, motions in port 1 will simulate false
keyboard presses, while port 2 has a far lesser effect. So if a game
requires keyboard input along with the joystick, port 2 is a necessity.
Then it just became standard.
--
White Flame (aka David Holz)
http://www.white-flame.com/
(spamblock in effect)
Kardon Coupé
while.....
put a joystick in port 2, and moving the joystick doesn't intefere with the
keyboard, put it in port 1 and it used to, so to stop wear and tear of
removing joysticks from the port?
or am I spouting it here?
"Christopher Prest" <ex...@FreeNet.Carleton.CA> wrote in message
news:br752s$aok$1...@freenet9.carleton.ca...
Christopher Prest
That makes sense, since many a time I have forgotten, and then
wnet and used joystick 1, and started getting crazy things
happening.
I was playing Pac Land last night, and all joystick 1 would do
was give me more credits :)
Chris
Anders Carlsson
> That makes sense, since many a time I have forgotten, and then
> wnet and used joystick 1, and started getting crazy things
> happening.
By the way, aren't the ports marked as A and B rather than 1 and 2?
I'll have to check when I get home. Since the register for reading
"port 2" also is located before the register to read "port 1", it
would have made sense to label them from the power button and forward
towards the user.
--
Anders Carlsson
Ye wonder, she's thirteen beyond an invisible carefully preserved leather
mouse. Sunday dungeons promising horseback cause loud guessed scissors.
Christopher Prest
called 'A' and 'B'
I just went to this link and looked around:
http://www.zimmers.net/cbmpics/cbm/c64/C64ServiceManual.txt
Chris
zero...@yahoo.spam_me_not.com
this mean?
Christopher Prest
thing.
His previous signature (no to close to fingernails etc.),
had an air of randomness to it.
Reminds me of those fridge magnets.
Chris
Anders Carlsson
> Yep, it looks like you are right Anders about them being
> called 'A' and 'B'
No, I was wrong. :)
I just checked both my old brown breadbin and the new grey flat one,
and both say control port 1 and 2. However, the CIA seems to label
them A (2) and B (1) which is terribly logic.
Regarding my signature(s).. someone else already asked, so here it goes:
The previous one ("not close to hair" etc) was an excerpt from a toy
car manual translated from Chinese into very poor English. I have had
the original text evaluated by a Mandarin speaking, and he confirmed
some words had both been translated with the wrong meaning and at the
same time misspelled. Once I put together a ~50 lines text document of
the "highlights" if anyone is interested to find out more.
The current one was picked up from one of these random porno spams
one gets, where a number of odd words have been put together and a
few "keywords" are inserted. I rearranged the words into barely
parseable sentences and shortened it to fit in a signature. I don't
know when I'll get tired of this and wait for next porno spam.
--
Anders Carlsson
Nospam9212
And vice versa! You can witness the joystick having an affect on the keyboard
matrix by plugging a 'stick into port 1 and rotating it around briskly. I seem
to remember the character "2" showing up a lot and also "space"... which gave
me an idea.
I did a little experimenting (might have looked it up in "Mapping") to see
which joystick positon was responsible for a space/chr$(32). I then removed the
wires from an old broken stick and attached the wires for that position to a
microswitch in a foot pedal I had kicking around. I fired up the game
"Commando" which required pressing the space bar to throw bombs. I hated that
cuz it forced me to let go of the joystick for a brief moment. Not anymore. I
continued to shoot while tapping the foot pedal to toss bombs at the enemy
without ever letting go of the stick.
I left the foot pedal plugged in for a quite sometime and used it anytime
software (mostly games) required that I use the space bar. I still have it
somewhere.
I believe that the "LipStick" voice activated input controller that came with
Echelon worked on this same principal. Rather than say "fire", like the
instruction said, I just used to blow into it ever so lightly. Same results. I
liked my home-made foot pedal better. I kinda felt like a dork wearing the
Lipstick on my head and shouting "FIRE FIRE FIRE". :)
-= Francis Yarra =-
fyarraATjunoDOTcom
http://members.aol.com/fyarra001/ads - My drywall website
http://members.aol.com/fyarra001 - My C64 website
http://members.aol.com/prsnl99 - My personal website
Chris D
nospa...@aol.commune (Nospam9212) wrote:
> Not anymore. I continued to shoot
> while tapping the foot pedal to toss bombs at the enemy
> without ever letting go of the stick.
.... I'm dumbfounded.... What a wonderful, SIMPLE, idea! :o
I Might just have to try that one! Anyone else do this?
- Chris D
Joe Bachmann
This is called ghosting (or shadowing)..
Check here for more information:
http://www.arcadecontrols.com/arcade_diodes.shtml
This is a big problem when hacking a KB for mame.. Ultimately, you can avoid
i by adding diodes on each key.. Or for the sake of a joystick port, pehaps a
line buffer would do the trick.. a 74ls244 or 245..
I like to use a Sega genesis controller, works awesome except that it nerfs
the kb due to ghosting..
JB
J. Robertson
<joe.ba...@newmail.net> wrote:
>I like to use a Sega genesis controller, works awesome except that it nerfs
>the kb due to ghosting..
Beware, it is possible to damage the CIA with Sega controllers. See
Article 26 in the Commodore Knowledge Base.
http://www.floodgap.com/retrobits/ckb/display.cgi?26
Jason
--
E-mail #1: jkr[at]westol.com
E-mail #2: jk...@juno.com
(Use E-mail #1 for a quicker response.)
Web site : http://www.westol.com/~jkr/
--