How To: HMT 2Timer..................(thumbnails)
 

Cheap way to switch between two programs when you have a 64K (512) ROM. Turn off ignition before swtiching programs.

First start off with 2 machine pin sockets
http://img517.imageshack.us/img517/1...r001tp3.th.jpg


Pull pin 1 from one of the sockets. This will be the bottom socket. Pin 1 is the bottom left pin, when the notch is to the left.
http://img364.imageshack.us/img364/2...r002cj1.th.jpghttp://img406.imageshack.us/img406/7...r003xt7.th.jpg


Solder a piece of wire to pin 1 on the top socket and put the two sockets together and you have a super cheap 2timer.
http://img135.imageshack.us/img135/6...r004tq1.th.jpg



The wire will go to a dip switch and from the switch to ground and 5V.

When the switch is to ground, the program will be the lower address bin, 0000H - 7FFFH.



Other version exactly like the moates product, so you can just use a regular switch that goes to ground. Uses a pull-up resistor.

http://img152.imageshack.us/img152/6...r005mx8.th.jpg

http://img152.imageshack.us/img152/2...r006lm1.th.jpg




This is the same as this product:
http://www.moates.net/product_info.p...products_id=80

[img width=300 height=220]http://www.moates.net/images/2timer_new.jpg[/img]

Re: How To: HMT 2Timer..................(thumbnails)
 

This would leave pin 1 floating or low depending on the switch then correct? So the only last thing that would be needed to duplicate the moates is drop a 1.0K ohm resistor between pin 1 and pin 28 for a pull-up, leaving you with a true high or low? that's my guess for the reason there is a resistor on their boards, I wouldn't see any other use for it.

Re: How To: HMT 2Timer..................(thumbnails)
 

Good point. High Z probably wouldn't be the most predictable thing to have. DIP switches work good for that though.

I'll show one with the pull-up resistor too, since most people won't have a DIP switch.

Re: How To: HMT 2Timer..................(thumbnails)
 

I thought this was gona be for a turbo timer damnit

Re: How To: HMT 2Timer..................(thumbnails)
 

Haha, that's what someone else said. He said no one is responding cause it's not a turbo timer. OKay, I'll see if I can make a super cheap, easy to make turbo timer.


New pics are up.

Re: How To: HMT 2Timer..................(thumbnails)
 

Great Job!
:y :y :y

Re: How To: HMT 2Timer..................(thumbnails)
 

So have you tested the pull-up? Was pin-28 the right pin to use? Just checkin before I try one of these out.

Thanks

Re: How To: HMT 2Timer..................(thumbnails)
 

That is actually pin 1.

And yes it's correct. Pin 1 is A15, which is the highest address pin.

Re: How To: HMT 2Timer..................(thumbnails)
 

I meant is pin-28(VDD) the correct pin to pull the 5V pull-up from, or does it ---- with anything to use that pin. That is all.
Stupid question, but oh well

Thanks

Re: How To: HMT 2Timer..................(thumbnails)
 

damnit, i just ordered one one of the moate's units a little over a month ago...

Re: How To: HMT 2Timer..................(thumbnails)
 

Hey, only questions not asked are stupid.

Yes, pin 28 is source voltage, so it is 5v.

You could also get 5 volts from pin 1 on the ecu since it is tied to Vcc as well. Hrmm, maybe I'll try that next.