So you're suggesting I make a circuit that is like a power on RESET signal for a CPU?
Think a 1Mega ohm resistor and 4.7 uF electrolytic capacitor would create a 3-5 second pulse to drive the schmitt's output low to the flipflops CLR inputs?
Thus causing 1Q and 2Q to both stay at LOW output while powering up the HAWK.
Hope I'm following this right..
Cant blame you for not wanting to change the Boot code if a solution is this simple.
Plus it keeps the "jogwheel" effect in place this way too :)
I dont have either of those component values on hand. I'll have to order them in.. along with all the other parts I'll be needing.
Good to know about the Boot ROM protection.
Thank you for the suggestion on making a delay signal.
-Blaine
--- In korgpolyex@yahoogroups.com, Michael Hawkins <korgpolyex800@...> wrote:
>
> I would recommend that you use a simple reset circuit to hold the two flip flops in the dormant state for a second after power up.
>
> A simple resistor and capacitor fed into one of the 74HC14 gates will provide a delayed reset. Feed the output into the clr on the flip flops.
>
> I don't really want to change the boot code; especially when you have two spare gates on the 74HC14 to use for a power on delay circuit.
>
>
> The boot ROM can't be written to when it is in the boot socket. So there's no chance of it being corrupted - ever, while it's in the boot socket location.
>
>
> Mike
>
>
>
> ________________________________
> From: bimmerfan222 <bperkins211@...>
> To: korgpolyex@yahoogroups.com
> Sent: Sunday, September 16, 2012 5:52 PM
> Subject: [korgpolyex] Re: Data Dial Encoder Project - WORKING!!!
>
>
> Â
>
>
> --- In korgpolyex@yahoogroups.com, Michael Hawkins <korgpolyex800@> wrote:
> >
> > You could use the two spare schmitt triggers in the 74HC14. By the way, you should use HC series, not LS.
> >
> > Mike
>
> I guess I'm at a disadvantage at how to use the schmitt triggers to accomplish this. Any pointers?
>
> The LS package was the only one I had in my TTL/CMOS stash. I'll get some HC's in my next part's order.
>
> --- In korgpolyex@yahoogroups.com, Michael Hawkins <korgpolyex800@> wrote:
> >
> > I could change the boot code for you. Such as, hold down Bank Hold and then Up or Down to engage the clear function.
> >
> > Easy to do.
>
> That would be the better version in my opinion. That way I can retain my "jogwheel" feature.
> I'm guessing it's wise to keep the CLEAR function in the event a corrupt code bricks the Korg up?
>
> Is the 1.5b kit you sent me able to reflash the Boot Rom? Is it wise for me to get an extra Chip so I can make a backup Boot Rom?
> If I somehow compromise my only boot code while poking and prodding into the synth, I'm SOL until I get another chip.
>
> -Blaine
>