464 and ram extension ....

[Bryce]

Ah, that explains a lot, so it is an NPN, that makes much more sense and it does switch when the AND output is high. I just wasn't expecting it to be a CEB Pinout, which are even rarer than the BCE pinouts. Is it TO-92 or SOT25? (Is it really round at the back or does it just have angles at the back).

Bryce.

Edit: Ok, I just took a look at my own DK expansion. Then I remembered that I had already uploaded pictures before I upgraded it. So you can see it here without the 74LS153 installed: http://www.cpcwiki.eu/imgs/3/35/DK64_Before.jpg

[MaV]

Is it TO-92 or SOT25? (Is it really round at the back or does it just have angles at the back).

The back is completely rounded, so that means it is a TO-92.

Edit: Ok, I just took a look at my own DK expansion. Then I remembered that I had already uploaded pictures before I upgraded it. So you can see it here without the 74LS153 installed: http://www.cpcwiki.eu/imgs/3/35/DK64_Before.jpg

Thanks, Bryce. But the layout of the 6128 256k-dk'tronics is completely different.