Denial

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

see here....

http://personalpages.tds.net/~rcarlsen/ ... switch.jpg
http://personalpages.tds.net/~rcarlsen/ ... switch.jpg

(mod: URLs repaired)

I know this isn't my post, but I get a 404 when I try to open the link
Fixed

Hi

Ok , if i understand correctly i czn use any of the two solution, right ?

Cheers

Laurent

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.

and sirectly applying a vcc on the reset pin ? not a good idea ?

Cheers

Laurent

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.

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.

O.K.

dimebag wrote:I mean VDD not VCC , RESET is active when low.... i remember

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.

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).