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Old 20 March 2007, 01:43   #1
Smiley
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Help with creating the cheap kickstart switcher from aminet.

http://aminet.net/hard/hack/cheapestksw.lha (added a .doc and jpg for people)
http://www.freewebs.com/smiley1635/ks%5Fswitch.doc


I am trying to create a version of this switcher for my A600 using 3 different roms. (1.3>2.04>3.1)

I have tried different methods and so far have failed. I have just now snapped the CS pin from my kickstart 3.1.

Is there anyway to fix a snapped kickstart rom leg?

I have had many different opinions and diagrams on how this kickstart switcher works.

So am I correct in thinking that :

  • CS legs are not soldered together. They are individually bent out sideways.
  • +5v legs are not soldered together. They are individually bent out sideways.
  • A 10k resisitor is added to each +5v leg
Basically I kinda of understand the +5v side of it.

I have no idea what to do with these CS legs!

Do I attach a wire from between the resistor and first wire to the ROMS CS leg?

I have had differing opinions from 3 different people and I still cannot get this to work.

Snapping the 3.1 CS leg was the final straw
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Old 20 March 2007, 02:09   #2
Zetr0
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I believe that CS is infact Vcc

as in Vcc/CS is the same...
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Old 20 March 2007, 06:23   #3
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CS = chip select line (or sometimes _CE for chip enable)
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Old 20 March 2007, 06:34   #4
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I think what he's saying here is to use the switch to set the _CS line high (tie it to VCC). I wouldn't think you would need to isolate the VCC (he shows them connected)..
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Old 20 March 2007, 12:30   #5
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Ok I have a clear idea of what I need to do now.

However I have one fatal problem.

How do I re-attach a kickstart leg?

I tried to solder it buts its too small to work with.

Every piece of information on the net has said that Vcc is pin 21 and CS is pin 10
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Old 20 March 2007, 15:01   #6
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Try chipping/filing the plastic away a little to expose more of the leg. Since you're going to be stacking, you can use a piece of wire instead.
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Old 20 March 2007, 15:19   #7
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What are the benefits of switching between ROMS?
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Old 20 March 2007, 16:16   #8
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Quote:
Originally Posted by adolescent
Try chipping/filing the plastic away a little to expose more of the leg. Since you're going to be stacking, you can use a piece of wire instead.
Cheers! How far can I file down? Maybe 1mm or so?

Quote:
Originally Posted by mywetpants
What are the benefits of switching between ROMS?
In order to run old games and apps .

I decided to do it when my wizball disk no longer worked on KS 3.1
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Old 20 March 2007, 16:40   #9
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I was under the assumption that game incompatibilities were down to the chipset, ie. AGA and ECS, and not the Kickstart?

So, if I got 1.3 roms, I can run the old A500 games without any problems?
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Old 21 March 2007, 09:27   #10
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Quote:
Originally Posted by Smiley
[/COLOR][/COLOR]
  • CS legs are not soldered together. They are individually bent out sideways.
  • +5v legs are not soldered together. They are individually bent out sideways.
  • A 10k resisitor is added to each +5v leg
Basically I kinda of understand the +5v side of it.

I have no idea what to do with these CS legs!
Your configuration should be like this:
CS legs bent out
+5 legs soldered together and connected to the motherboard, not bent out.
ONLY the CS legs are bent out, nothing else.

The circuit:
CS is active low, meaning it is active if you ground it.

Look at the schematic.

The schematic says that you connect a pull up resistor between each CS leg and +5 volt.. This +5 can be the +5 pin on the chip sandwich, or any other place on your motherboard that provides +5.

This means that by default each chip is OFFLINE because the CS line is being pulled high (to +5V) via the resistor.

Now look at the schematic again. Each CS pin is connected via a switch to ground.

Since there is no resistor here, when you turn the switch on, completing the grounding circuit, it will overpower the pull up resistor and force the pin low, activating the chip.

Ask if you require more info, I'm probably not clear enough, but I can't think of a clearer way to explain this now.
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