A600 PiggyBack Mod (Pr0n for zetr0, the perv)

[FOL]

Here's my attempt at the piggyback mod.

First, I bent the legs, so they gripped tightly to the original ic's. Then I used flux on all the pins, then heated the new ic legs and added the solder at the point of the joint. Worked great, even with a big soldering iron. This method enabled me to solder the legs in between as the ic's are so close together.

[TheCorfiot]

@FOL

Sterling work my friend, like the legs bent under & soldered...First class.

It does work though doesn't it,, you didn't say :laughing

BTW Thanks for the sat night pr0n......:D

TC ;)

[FOL]

Now, when putting it back together, I hit a problem. The Floppy drive had a screw that pushed up against the pins of the piggyback ic's. Simple answer was to remove the screw and add some engineers tape to stop any metal shorting out.

[FOL]

@FOL

Sterling work my friend, like the legs bent under & soldered...First class.

It does work though doesn't it,, you didn't say :laughing

BTW Thanks for the sat night pr0n......:D

TC ;)

Oh, they were pre-bent and wires added by zetr0, ;). Saved me the hastle of doing it, ;). Thanks zetr0.

[Magno Boots]

Nice one FOL :great

Can you tell me which pins were not soldered / bent underneath?

I've got the chips with wires (from Zetty also), but not sure as what not to solder. Pins numbers are foreign to me.

A few simple arrows on your pics would help me out.

Regards

[FOL]

Nice one FOL :great

Can you tell me which pins were not soldered / bent underneath?

I've got the chips with wires (from Zetty also), but not sure as what not to solder. Pins numbers are foreign to me.

A few simple arrows on your pics would help me out.

Regards

They should be 28 & 29, if I remember correctly. I searched for ages myself, maybe zetr0 could get his post stickied (that gives you pics of pins and locations).

I just had a search around the eab, and I cant find it now, lol.

[FOL]

@FOL

Sterling work my friend, like the legs bent under & soldered...First class.

It does work though doesn't it,, you didn't say :laughing

BTW Thanks for the sat night pr0n......:D

TC ;)

It DID work for awhile. Then refused to boot, think I had some other problems causing it though. As when I bought the A600, the guy didnt pack it properly, so it was hammered by the PSU (heavy type and 2 floppy boxes) in the post (good ol royal mail, lol). I ended up removing the mod and it still was playing up, then it seemed to kick into life and work.

[Zetr0]

@FOL

this is GREAT!!!! I reall am impressed, nice work m8.

I have really been wanting to put up a proper how to, but have completely run out of time.

I truely thank you FOL for doing this.

The first time i did this mod, I fried two chips with the Floppy Drive!!! soon sorted that out with the Black Tape method.

[Magno Boots]

I'm wanting to have a go at this mod today but.. I'm confusing myself!

See pic of chip donated by Zetr0.

19095

Are the bent pins with wires soldered on the correct side? They contradict the pictures of FOL's mod.

When both chips are compared with the indent at the top the wires are attached at different sides of each chip.

Also, where is pin one located? Please use my pic as a reference.

Many thanks.

[Shoonay]

The first time i did this mod, I fried two chips with the Floppy Drive!!! soon sorted that out with the Black Tape method.Sometimes I really wonder Z, if you're The Black Master Technician WiZard0 of EAB or just a silly kid who got his first soldering iron for christmas :p

[FOL]

I'm wanting to have a go at this mod today but.. I'm confusing myself!

See pic of chip donated by Zetr0.

19095

Are the bent pins with wires soldered on the correct side? They contradict the pictures of FOL's mod.

When both chips are compared with the indent at the top the wires are attached at different sides of each chip.

Also, where is pin one located? Please use my pic as a reference.

Many thanks.

Your right, those are the wrong pins bent over.

It should be the other side, as yours is showing pins 8 and 9 bent over. Should be 28 and 29.

I have the diagram in work, let me look tommorow and I will post exactly which pins it should be.

With this type of i.c., they normal mark the front with a bevel. Once you know which is the front, you can lay the ic down and turn it so the bevel is at the top. Then you go from top left pin (pin 1) down, once you reach the last leg on the left, you then continue counting up from bottom right. They may also have a circle (normally called pip) in the top left corner (pin 1).

I have come across flat pack (surface mount) ic's with no bevel and 2 pips in each corner. It can get confusing, I have put 2 ic's in the wrong way round in the past due to that, :(. I learnt the hard way about not marking which way round they went before removing the ic's I was replacing, ;).

[Magno Boots]

Thanks for the clarification FOL :great. I knew something wasn't correct. Just needed confirmation.

I'm going to try the 'A1K' method in which pins 11, 12, 15 & 30 are left free (as per Merlin's translation).

I will solder the remaining pins should this not prove succsessful.

Fingers crossed and update to follow...

[FOL]

Thanks for the clarification FOL :great. I knew something wasn't correct. Just needed confirmation.

I'm going to try the 'Amiga.org' method in which pins 11, 12, 15 & 30 are left free (as per Merlin's translation).

I will solder the remaining pins should this not prove succsessful.

Fingers crossed and update to follow...

Pins 11, 12, 15 and 30?

[Zetr0]

@MagnoBoots

Ahhh!!!!

good catch..... I have no reason or exscuse for that, I am humbly sorry about it, do you need another set ?

[Zetr0]

@MagnoBoots

Pins 11.12,15 and 30 are NC on the chips, athough I would suggest welding them down to avoid any floating pins / currents to be honest.

[Zetr0]

okay, so suffering from a little more insomnia than normal.

I finally gor round to making, atleast an easy to follow diagram that should compliment the HOW-TO FOL has put here :)

firstly lets look at the chip pinout
http://www.guildserver.co.uk/data_images/a600-pbc/schematic-001.png

now lets look at this inline and connections to the motherboard
http://www.guildserver.co.uk/data_images/a600-pbc/schematic-002.png

In the Above, position E152 is actualy the signal side of R152, its very important to make sure you are on the correct side of the component otherwise you will ust ground the signal and nothing will happen.

anyway I do hope it helps, as with anything of late, please double check, although I do check, I am prone to make errors, I suppose it proves I am human after all... maybe....

I would like to thank FOL for an absolutely excellent How-To, the guys at A1k for making it happen, Merlin for translating it and amiga.resource for the image i have included here.

[Zetr0]

Sometimes I really wonder Z, if you're The Black Master Technician WiZard0 of EAB or just a silly kid who got his first soldering iron for christmas :p


LOL, infact i think I suffer from focus fail my friend, iF I repeat something more than twice, I thinks its systemic to my genetic code to fail on the 3rd attempt!!!!

the above is a technical way of saying I suffer from blonde moments!!!! :D

[FOL]

okay, so suffering from a little more insomnia than normal.

I finally got round to making, atleast an easy to follow diagram that should compliment the HOW-TO FOL has put here :)

No problems, maybe the mods at EAB could sticky all mods like this. I had murder trying to find your original schematics on how to do this.

Still got to paypal you, I keep forgetting, :(.

[Shoonay]

LOL, infact i think I suffer from focus fail my friend, iF I repeat something more than twice, I thinks its systemic to my genetic code to fail on the 3rd attempt!!!!Oh, yeah, the good old probability theory, aye? ;)
Personally I love that one, used to make me win in some random games :D

[Magno Boots]

Zetr0,

Thankyou for the offer of a replacement, but I need to get that iron out and get some practice in!

May I assure you that my post was not to embarrass you in any way and I apologise if it has done so.

I needed confirmation of which chip was incorrectly wired as FOL stated that his attempt was once working / now not working.

Your sketch is exactly what is needed to carry out this mod :great.

Magno

[FOL]

Zetr0,

Thankyou for the offer of a replacement, but I need to get that iron out and get some practice in!

May I assure you that my post was not to embarrass you in any way and I apologise if it has done so.

I needed confirmation of which chip was incorrectly wired as FOL stated that his attempt was once working / now not working.

Your sketch is exactly what is needed to carry out this mod :great.

Magno

lol, i believe my not working problem was down to the A600 being battered in the post. I have had some odd things happen with it. It is how ever working ok at the moment, ;).

[DDNI]

fellas, ever get the feeling that you missed something?

I just got an A600 up and running. Can someone explain to me what this hack is all about...?

Cheers

[FOL]

fellas, ever get the feeling that you missed something?

I just got an A600 up and running. Can someone explain to me what this hack is all about...?

Cheers

It adds another 1MB CHIP RAM. So you end up with 2MB CHIP RAM total, just like an A1200.

[UberFreak]

Hi

Sorry for bringing this old thread back from the dead :)

I noticed in the pictures above, the RAMs used are of EDO type.
I remember reading somewhere that EDO will not work in the A600.

I have a couple of these (60ns ones, not 50ns as in the pics) and wondered if they will work?

Thanks!

[FOL]

Hi

Sorry for bringing this old thread back from the dead :)

I noticed in the pictures above, the RAMs used are of EDO type.
I remember reading somewhere that EDO will not work in the A600.

I have a couple of these (60ns ones, not 50ns as in the pics) and wondered if they will work?

Thanks!

Im not sure. Best if Zetr0 answers that.

As for not working, I would say thats rubbish. Mine worked for awhile, then Zetr0 pointed out that different things need to be done to different revision boards.

[Zetr0]

@UberFreak

Hello there,

As far as I know any EDO feature is just ignored on the Amiga, I dont think that these chips used here are EDO, might I ask what makes you think that these chips are EDO?

I have dug up the other thread about this, as the above here is for the JunBug revision 1.5 you need to route the LCAS and UCAS signals elsewhere on the motherboard for different version.

What ever version you have you can just solder the LCAS lines to pin 35 of the expansion bus, and UCAS to pin 36

have a look at this post (http://eab.abime.net/showpost.php?&p=502449)

http://www.guildserver.co.uk/data_images/schematics/A6002mbch/A6PBH-AR.png

hope that helps.

[FOL]

Thanks,

That makes this thread pretty much complete now, ;).

[Zetr0]

OOoOoo STICKY!!!

[UberFreak]

Hi

@Zetr0:

The chips in the 1st set of pics are Alliance as4c256k16e0-50jc.
According to their datasheet, they are EDO.
I have a pair of as4c256k16e0-60jc, the 60ns version, also EDO.

Btw, that diagram is what got me confused in the first place, there's an error in it!

On the right side (the red & blue squares), the red says Amiga Pin 35 (should be 36) and the blue says Pin 36 (should be 35).

The pictures on the left are ok.

Thanx for the replies! :)

[FOL]

Hi

@Zetr0:

The chips in the 1st set of pics are Alliance as4c256k16e0-50jc.
According to their datasheet, they are EDO.
I have a pair of as4c256k16e0-60jc, the 60ns version, also EDO.

Btw, that diagram is what got me confused in the first place, there's an error in it!

On the right side (the red & blue squares), the red says Amiga Pin 35 (should be 36) and the blue says Pin 36 (should be 35).

The pictures on the left are ok.

Thanx for the replies! :)

Your right, nice spot, ;). Zetr0's eyes must be failing, ;).

[Zetr0]

:o *embarrased*

I am truely sorry,

I whipped that schematic at the time so quickly :o

I have updated the error, thanks HUGELY for spotting it!!!!