Hello
How to create a reset button ?
as i can remember i can put a switch between pin #1 and #40 onto the 6502 .... right ?
Cheers
Laurent
reset button
Moderator: Moderators
- mrr19121970
- Vic 20 Nerd
- Posts: 873
- Joined: Tue Jan 19, 2016 9:22 am
- Location: Germany
- Occupation: IT service manager
Re: reset button
see here....
http://personalpages.tds.net/~rcarlsen/ ... switch.jpg
http://personalpages.tds.net/~rcarlsen/ ... switch.jpg
(mod: URLs repaired)
http://personalpages.tds.net/~rcarlsen/ ... switch.jpg
http://personalpages.tds.net/~rcarlsen/ ... switch.jpg
(mod: URLs repaired)
Re: reset button
I know this isn't my post, but I get a 404 when I try to open the link
Fixed
Fixed
-Floopy
Re: reset button
Hi
Ok , if i understand correctly i czn use any of the two solution, right ?
Cheers
Laurent
Ok , if i understand correctly i czn use any of the two solution, right ?
Cheers
Laurent
- Mike
- Herr VC
- Posts: 4870
- Joined: Wed Dec 01, 2004 1:57 pm
- Location: Munich, Germany
- Occupation: electrical engineer
Re: reset button
No. You are supposed to first identify the type of your mainboard (VIC-20 or VIC-20CR), and then apply the solder job corresponding to your type of the mainboard.
If you're unsure how to proceed, you're better off with a user-port reset switch.
If you're unsure how to proceed, you're better off with a user-port reset switch.
Re: reset button
and sirectly applying a vcc on the reset pin ? not a good idea ?
Cheers
Laurent
Cheers
Laurent
- Mike
- Herr VC
- Posts: 4870
- Joined: Wed Dec 01, 2004 1:57 pm
- Location: Munich, Germany
- Occupation: electrical engineer
Re: reset button
Just for you to know: /RESET is low-active, i.e. the reset pin needs to be set to low level, not high level (Vcc) to make a reset.
As a rule of thumb: if you need to ask someone else where to solder inside a computer, because you cannot infer this for yourself from schematics and data sheets, in short-range it's better when you buy a ready made solution (and in the long-range, it's an incentive to learn this skill with less critical test circuits. The worst damages are done by people who "solder around" or similar without really knowing what they do).
VIC-20s are not anymore readily available, and one destroyed VIC-20 is that: one less. Simple as that.
As a rule of thumb: if you need to ask someone else where to solder inside a computer, because you cannot infer this for yourself from schematics and data sheets, in short-range it's better when you buy a ready made solution (and in the long-range, it's an incentive to learn this skill with less critical test circuits. The worst damages are done by people who "solder around" or similar without really knowing what they do).
VIC-20s are not anymore readily available, and one destroyed VIC-20 is that: one less. Simple as that.
Re: reset button
I mean VDD not VCC , RESET is active when low.... i remember
i have done this mods when i was young on my Vic 20 and my CBM 8032, but as i know how to solder.... i'll solder a reset button following the pictures.
Cheers
Laurent
i have done this mods when i was young on my Vic 20 and my CBM 8032, but as i know how to solder.... i'll solder a reset button following the pictures.
Cheers
Laurent
- Mike
- Herr VC
- Posts: 4870
- Joined: Wed Dec 01, 2004 1:57 pm
- Location: Munich, Germany
- Occupation: electrical engineer
Re: reset button
O.K.i have done this mods when i was young on my Vic 20 and my CBM 8032, but as i know how to solder.... i'll solder a reset button following the pictures.
From your first post, mentioning pins #1 and #40 of the 6502, you would have connected /RESET to Vcc though. It was for this reason I found it fair enough to hold you back a bit, and let you thoroughly think over your solder job before you start with it.dimebag wrote:I mean VDD not VCC , RESET is active when low.... i remember
Good luck!
Michael
P.S. the two pictures put the reset button in to discharge the integrating capacitor of the 555 reset circuit. Thus one gets a defined reset pulse to the CPU without signal bounces (as would be the case with a simple /RESET - GND switch).