Help with Z2 adapter on A500

[cv643d]

I have made a homemade Zorro 2 slot for an Amiga 500. I simply wired 1 from the expansion port of the A500 to 1 on the Zorro 2 slot and so on to 86.

Now I have read somewhere that most A2000 cards should work in an 86 pin Zorro 2 slot but so far all three Z2 memory boards (that work in my A2000) I have tried have not worked! (MAST, C= 2/8 MB board).

So I read about Zorro hacks on the Aminet and found out that I should perhaps connect pin 94 of the Zorro 2 slot to pin 11 on the 74LS32 chip under the floppy drive, but still the same results, no card work :-/

I still have some Zorro cards to try but I don’t know if I want to fry a CV64-3D or a Buddah controller.

Have anyone got some advice to get it working?

[cv643d]

I just checked everything again. I did not check each wire because I am almost 100% sure that pin 1 on the A500 expansion slot goes to pin 1 on the Zorro adapter and so on.

I soldered 1,3,5,7 and so on on one side, and 2,4,6,8.. and so on, on one side of the Zorro slot. Now I asume that Pin 1 on the mobo is the same as Pin 1 on the Zorro slot.

I did not do anything with the pins over Pin 86 this time, but perhaps I should ground every ground pin over Pin 86?

The Zorro cards do get slightly warm over some of the chips when I try them, but they show up as 0 MB fast

[cv643d]

Ah, finally someone who built one..

I am going to follow that doc when I try it again.

[cv643d]

Im curious, is that a full length Z2 card that you have fitted inside your A500.

[cv643d]

I have been measuring with my eye if a cv64-3D could fit inside the A500. But I think a smaller SFF case would be a better choise, since the card runs hot.

@Wol

Thank you, you sent that article to me in another thread :-)

It was interesting to read and it is that article that got me inspired to make an 86 pin Zorro slot (without chips or circuits) since they said many cards would work fine on it.

[cv643d]

Yes, I finally got it to work! My 2 MB C= board is showing up as 2 MB fast RAM

Disconnectec some wires that didnt match (checked http://gd.tuwien.ac.at/hw-related/hwb/co_ZorroII.html) and connected pin 94 on the Zorro slot to pin 53 on the expansion port, I am happy