A600 PiggyBack Mod (Pr0n for zetr0, the perv)

[FOL]

Originally Posted by 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 .

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]

Originally Posted by 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

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]

Originally Posted by 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!

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



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]

Originally Posted by 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!

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

[Zetr0]

*embarrased*

I am truely sorry,

I whipped that schematic at the time so quickly

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