Sinclair ZX80 / ZX81 / Z88 Forums

I have some.

see attached file, note: Y1 is not used.

Here is schematic for 6 GAL and 1 TTL

photoupload

You may be right in this point. But I think there is no particular reason for making the body wider than necessary except an historical. This is just a waste of space even when it's a common practice. ;) I forget the real reason, it looks like they want to use the same lead frame size for both 14 a...

You compare 16 pin (NXP) with 14 pin (TI), that's not right.
Normally the body of 16 pin package is closer to its leg than 14 pin package, it's standard for every company.

I also want one part kit.

i would be interested in a board / kit

I understand your point, I ask McLeod if he have any comment.
I'm OK to change the value of resistors, a group of forum's members in Spain is going to order the new batch.
Maybe they want to know a bout this change.

I can connect both signals to my broadcast monitor, it's a high quality SONY BVM9045D. I can switch between composite and RGB simply by clicking on the front and that was the reason to have the same output level or brightness when switching. The monitor was calibrated a few weeks ago by a professio...

But you could checkout the voltage levels for the signals and my proposal to use other resistor values for R19,R20,R21,R34,R38,R43 to get a more standard video signal. If you like to follow the datasheet, the max input level is 714mV pp (full range signal) for the RGB inputs of AD724 while it was i...