Sinclair ZX80 / ZX81 / Z88 Forums

Did we need to send money or be patient or take some helpful action?

How about testing with a base resistor less than that and adding a variable pot in series. Testing for middle of the road operation then get accurate ohms and then maybe a math. model given the char's of this TR2 and the ZTX313.

Then again maybe I shouldn't be so lazy and do it myself....

That is true.
Once you have ZXPand with RAM built in the case there is no way to add UDG externaly.
That speaks against internal ZXPand (or add internal UDG as well)
Kind regards Paul

Now I may be really running out of room! Must give pause...

I would suggest an internal ZXPand. Sirmorris is able to offer a solution for this. I am so glad sirmorris will change the form and layout to fit a board to my specifications! Now maybe I should ask(bribe) him:) But on the other hand, do you know the ZXNU? This is a ZX81 and ZX80 compatible Mainboa...

Is that board and fan installed atop The cooling system for a nuke reac? Looks like that from the picture notice the reddiah-orange glow...

Mouser is right down the road from me! I have stacks and stacks of their catalogues.

From photos above, it appears a DIP chip will fit a ZIP or DIP socket?

Gammaray, Are these sockets, which you bought from the Ebay, green? Does these sockets have its 3M brand labels? I have not tested an Aries socket with its round pins in DIP socket. Thanks, Dessony The cheap textool and 3M clone sockets that you can get from China have rectangular pins and are impo...

I bought some (probably not 3m just chinese knockoffs) from Ebay that had rectangular pins and tried twisting to fit in dip socket...but they warped the sleeves where the chip inserts. Didn't want to use ZIP pinned socket because I wanted to put DIP in case I wanted to remove ZIF. Not sure what to d...

I just got one!(ordered that is) board said 4left -1 =3?